阅读说明：本技术 一种壳状牙齿矫治器的设计方法、制备系统及制备方法 (Design method, preparation system and preparation method of shell-shaped tooth appliance ) 是由 李利 王秀娟 赵晓磊 刘珊珊 姚峻峰 于 2019-11-29 设计创作，主要内容包括：本发明提供一种壳状牙齿矫治器的设计方法、制备系统及制备方法,其中,设计方法包括：获取患者的初始牙列模型信息；将初始牙列模型信息与参考模型的牙列信息进行比对,获取患者的牙列特征信息；根据牙列特征信息生成当前患者的数字化牙齿矫治方案；根据数字化牙齿矫治方案,生成壳状牙齿矫治器数字模型。本申请提供一种壳状牙齿矫治器的设计方法、制备系统及制备方法,在壳状牙齿矫治器的设计、制造过程中,无需人工干预,实现了智能化的设计与制造。(The invention provides a design method, a preparation system and a preparation method of a shell-shaped tooth appliance, wherein the design method comprises the following steps: acquiring initial dentition model information of a patient; comparing the initial dentition model information with the dentition information of the reference model to obtain the dentition characteristic information of the patient; generating a digital tooth correction scheme of the current patient according to the dentition characteristic information; and generating a shell-shaped dental appliance digital model according to the digital dental appliance scheme. The application provides a design method, a preparation system and a preparation method of a shell-shaped tooth appliance, which are used for realizing intelligent design and manufacture without manual intervention in the design and manufacture processes of the shell-shaped tooth appliance.)

1. A design method of a shell-shaped tooth appliance is characterized by comprising the following steps:

acquiring initial dentition model information of a patient, wherein the initial dentition model information at least comprises tooth information, dental arch information and occlusion information;

comparing the initial dentition model information with dentition information of a reference model to obtain dentition characteristic information of a patient, wherein the dentition characteristic information at least comprises characteristic parameter information of a single tooth and characteristic parameter information of a dental arch;

generating a digital tooth correction scheme of the current patient according to the dentition characteristic information;

and generating a shell-shaped tooth appliance digital model according to the digital tooth appliance scheme.

2. The method of claim 1, wherein the reference model comprises at least one of a standard model, a big data fitting model, and a classification model.

3. The method of designing a shell-shaped dental appliance of claim 1, wherein the obtaining initial dentition model information for the patient comprises:

acquiring intraoral data of a patient;

acquiring the initial dentition model of the patient based on the intraoral data, identifying the dentition arrangement of the initial dentition model, and determining the tooth mark of each single tooth in the initial dentition model through the dentition arrangement; and acquiring relative position parameters of the dental arch based on the tooth position arrangement and the tooth marks, and measuring and establishing parameters of the dental arch.

4. The method of designing a shell-shaped dental appliance of claim 3, wherein the identifying the dentition arrangement of the initial dentition model comprises:

establishing a first prior model, including acquiring the distance between every two adjacent teeth and the number of missing teeth corresponding to the distance in the existing dentition model in a database, and calculating probability distribution function values for the distances of the missing teeth with different numbers;

acquiring the distance between two adjacent teeth in the initial dentition model of the patient;

the dentition of the initial dentition model is determined based on a hidden markov model.

5. The method of designing a shell-shaped dental appliance of claim 4, wherein the identifying the dentition of the initial dentition model comprises:

constructing a tooth state sequence vector of the existing dentition model, wherein the tooth state sequence vector is represented by K, and K is [ K ═ K [ ]₁，k₂，k₃，...，k_2n-1]Wherein n is the number of teeth contained in the existing dentition model, the vector K contains 2n-1 elements, the values of odd elements are tooth labels, and the values of even elements are the number of missing teeth between two adjacent teeth;

constructing a dental observation sequence vector of the initial dentition model, wherein the dental observation sequence vector is represented by B, and B ═ X₁，b₁，X₂，b₂，X₃，b₃，...，b_n-1，X_n]Wherein X is_iRepresents the ith tooth and is expressed by a constant, i is an integer from 1 to n, b_jRepresenting a spacing value between two adjacent teeth, j is an integer from 1 to n-1, and n is the number of teeth included in the initial dentition model;

calculating the probability value of each value of the tooth state sequence and the tooth observation sequence appearing at the same time; and taking the tooth position arrangement condition represented by the value of the tooth state sequence corresponding to the calculated maximum probability value as the tooth position arrangement of the initial dentition model.

6. The method of claim 3, wherein the initial dentition model information is compared with single tooth information of a corresponding label in reference model dentition information to obtain characteristic parameter information of a single tooth of the patient;

the characteristic parameter information of the single tooth at least comprises: and acquiring a distance deviation value of a single tooth along the direction of an arch line, a distance deviation value along the direction of a perpendicular line of the arch line in the plane of the arch and an angle deviation value of the tooth axis of each tooth and the tooth axis of the reference model along the direction of a normal line of the plane of the arch according to the tooth marks.

7. The method of claim 3, wherein the initial dentition model information is compared to arch information in a reference model to obtain arch characteristic parameter information representing an arch of the patient;

the arch characteristic parameter information includes an arch index, an arch length, an arch width, an arch curvature in the initial dentition model information, and at least one of an arch length, an arch width, and a deviation value of an arch curvature corresponding to the reference model in the initial dentition model information.

8. The method for designing a shell-shaped dental appliance according to claim 1, wherein generating a digital dental appliance plan for a current patient according to the dentition feature information specifically comprises:

acquiring characteristic parameter information of a dental arch of a patient; calculating the characteristic parameter information of the dental arch of the patient, selecting a candidate dental arch correcting process matched with the calculation result from a database when the calculation result is not greater than a first preset threshold value, and designing a digital correcting scheme of teeth to be corrected according to the correcting process of the candidate dental arch;

when the calculation result is larger than a first preset threshold value, acquiring characteristic parameter information of a single tooth of a patient, calculating the characteristic parameter information of the single tooth, and screening out a correction target tooth; calculating and screening out the correction process of the candidate dental arch in a database according to the characteristic parameter information of the correction target tooth, and designing a digital correction scheme of the tooth to be corrected according to the correction process of the candidate dental arch.

9. The method for designing a shell-shaped dental appliance according to claim 1, wherein generating a digital dental appliance plan for a current patient according to the dentition feature information specifically comprises:

acquiring characteristic parameter information of a single tooth of a patient; calculating the characteristic parameter information of the single tooth, and comparing the calculation result with a second preset threshold value to screen out at least one corrected target tooth; selecting at least one tooth corrected candidate tooth data set matched with the correction target tooth from a database; acquiring the characteristic parameter information of the dental arch of the patient, combining the candidate tooth data set with the characteristic parameter information of the dental arch of the patient, and acquiring the parameter information of the dental arch of the patient after the dental arch is planned to be corrected; and correcting and arranging the correction target teeth by taking the correction target teeth as an initial state and taking the dental arch after the correction as a target state, and designing a digital correction scheme of the teeth to be corrected.

10. The method for designing a shell-shaped dental appliance according to claim 8 or 9, further comprising a digital appliance program verification of the tooth to be corrected, specifically comprising:

calculating the stress size and/or the moment size and the moment direction of the orthodontic target tooth by adopting a finite element algorithm for the movement amount of each orthodontic target tooth in the digital orthodontic scheme, and judging whether the stress size and/or the moment size and the moment direction are within a preset range; if so, outputting a digital correction scheme of the tooth to be corrected, which comprises the step-by-step information; if not, changing the first preset threshold or the second preset threshold, and screening the candidate dental arches or the candidate teeth again in the database for design.

11. The method of claim 8 or 9, wherein before generating the digital dental appliance plan for the current patient based on the dentition characteristic information, the method further comprises a bite relationship classification step, specifically comprising:

acquiring occlusion information in the initial dentition model information;

comparing the occlusion information with occlusion information of a reference model to obtain occlusion classification information of an initial dentition;

and screening a corresponding occlusion type database according to the occlusion classification information.

12. The method of designing a shell-shaped dental appliance of any one of claims 1-9, further comprising obtaining confirmation information of the digital dental appliance by a doctor or a patient before generating the digital model of the shell-shaped dental appliance according to the digital dental appliance.

13. The method of claim 12, wherein the obtaining of confirmation information of the digital dental appliance by the doctor or the patient comprises:

acquiring personal information of a patient, and generating patient file information containing the information of the demand of the patient on teeth to be corrected;

calling doctor information, and matching the doctor information with the archive information of the patient to be treated;

and pushing the matched doctor information to the patient, and acquiring confirmation information of the doctor and the patient on the digital correction scheme.

14. A preparation system of a shell-shaped tooth appliance is characterized by comprising: the device comprises an information acquisition module, a shell-shaped tooth appliance design module and a preparation module;

the information acquisition module is used for acquiring initial dentition model information of the patient;

a shell-shaped dental appliance design module, which adopts the shell-shaped dental appliance design method of any one of claims 1 to 13 to design and generate a shell-shaped dental appliance digital model;

and the preparation module is used for preparing the shell-shaped dental appliance based on the shell-shaped dental appliance digital model.

15. A preparation method of a shell-shaped tooth appliance is characterized by comprising the following steps:

acquiring initial dentition model information of a patient, wherein the initial dentition model information at least comprises tooth information, dental arch information and occlusion information;

comparing the initial dentition model information with dentition information of a reference model to obtain dentition characteristic information of a patient, wherein the dentition characteristic information at least comprises characteristic parameter information of a single tooth and characteristic parameter information of a dental arch;

generating a digital tooth correction scheme of the current patient according to the dentition characteristic information;

generating a shell-shaped tooth appliance digital model according to the digital tooth appliance scheme;

and preparing the shell-shaped tooth appliance according to the shell-shaped tooth appliance digital model.

Technical Field

The invention relates to the technical field of tooth correction, in particular to a design method, a preparation system and a preparation method of a shell-shaped tooth corrector.

Background

Malocclusion can bring great harm to local or even whole body of the oral cavity: affecting the development of the maxillofacial area, the health of the oral cavity, the function of the oral cavity, the appearance and the like. Patients are currently being treated by surgery or by wearing an orthosis. With the development of technology and the improvement of aesthetic quality, based on the development of computer technology and materials, the treatment of malocclusion by adopting an invisible correction method is accepted by more and more patients, and malocclusion teeth are corrected by wearing a series of shell-shaped tooth correction devices and continuously moving teeth in a small range.

The design of the existing shell-shaped tooth appliance is generally that after a technician or a doctor designs an appliance scheme with the aid of a corresponding program, the shell-shaped tooth appliance is designed according to the appliance scheme. The existing design method has high artificial participation degree, high dependence on design experience and medical experience, and longer design process period, and can not meet the requirements of individuation and high efficiency of the invisible correction patients. Moreover, in the existing procedures, the intraoral data of the patient needs to be manually identified and subjected to labeling processing, manual labeling of teeth has the disadvantages of low efficiency, low speed and the like, and once the labeling is wrong, the subsequent design is seriously influenced.

Disclosure of Invention

The application provides a design method, a preparation system and a preparation method of a shell-shaped tooth appliance, which are used for realizing intelligent design and manufacture without manual intervention in the design and manufacture processes of the shell-shaped tooth appliance.

The technical scheme provided by the invention is as follows:

a design method of a shell-shaped dental appliance comprises the following steps:

acquiring initial dentition model information of a patient, wherein the initial dentition model information at least comprises tooth information, dental arch information and occlusion information;

comparing the initial dentition model information with dentition information of a reference model to obtain dentition characteristic information of a patient, wherein the dentition characteristic information at least comprises characteristic parameter information of a single tooth and characteristic parameter information of a dental arch;

generating a digital tooth correction scheme of the current patient according to the dentition characteristic information;

and generating a shell-shaped tooth appliance digital model according to the digital tooth appliance scheme.

Further preferably, the reference model includes at least one of a standard model, a big data fitting model, and a classification model.

Further preferably, the acquiring initial dentition model information of the patient includes:

acquiring intraoral data of a patient;

acquiring an initial dentition model of a patient based on the intraoral data, identifying the dentition arrangement of the initial dentition model, and determining the tooth label of each single tooth in the initial dentition model according to the dentition arrangement;

acquiring relative position parameters of dental arches based on the dental position arrangement and the tooth labels, and measuring and establishing parameters of the dental arches;

further preferably, the method for identifying the dentition arrangement of the initial dentition model comprises the following steps:

establishing a first prior model; the method comprises the steps of collecting the distance between every two adjacent teeth in an existing dentition model in a database and the number of missing teeth corresponding to the distance, and calculating probability distribution function values for the distances of different numbers of missing teeth;

acquiring the distance between two adjacent teeth in the initial dentition model;

the dentition of the initial dentition model is determined based on a hidden markov model.

Further preferably, the identifying the dentition arrangement of the initial dentition model specifically includes the steps of:

constructing a tooth state sequence vector of the existing dentition model, wherein the tooth state sequence vector is represented by K, and K is [ K ═ K [ ]₁，k₂，k₃，...，k_2n-1]Wherein n is the number of teeth contained in the existing dentition model, the vector K contains 2n-1 elements, the values of odd elements are tooth labels, and the values of even elements are the number of missing teeth between two adjacent teeth;

constructing a dental observation sequence vector of the initial dentition model, wherein the dental observation sequence vector is represented by B, and B ═ X₁，b₁，X₂，b₂，X₃，b₃，...，b_n-1，X_n]Wherein X is_iRepresents the ith tooth and is expressed by a constant, i is an integer from 1 to n, b_jRepresenting a spacing value between two adjacent teeth, j is an integer from 1 to n-1, and n is the number of teeth included in the initial dentition model;

calculating the probability value of each value of the tooth state sequence and the tooth observation sequence appearing at the same time; and taking the tooth position arrangement condition represented by the value of the tooth state sequence corresponding to the calculated maximum probability value as the tooth position arrangement of the initial dentition model.

Preferably, the initial dentition model information is compared with the single tooth information of the corresponding label in the reference model dentition information to obtain the characteristic parameter information of the single tooth of the patient;

the characteristic parameter information of the single tooth at least comprises: and acquiring a distance deviation value of a single tooth along the direction of an arch line, a distance deviation value along the direction of a perpendicular line of the arch line in the plane of the arch and an angle deviation value of the tooth axis of each tooth and the tooth axis of the reference model along the direction of a normal line of the plane of the arch according to the tooth marks.

Preferably, the initial dentition model information is compared with dental arch information in a reference model to obtain dental arch characteristic parameter information representing a dental arch of a patient;

the arch characteristic parameter information includes an arch index, an arch length, an arch width, an arch curvature in the initial dentition model information, and at least one of an arch length, an arch width, and a deviation value of an arch curvature corresponding to the reference model in the initial dentition model information.

Further preferably, the generating of the digital dental correction scheme of the current patient according to the dentition feature information specifically includes:

acquiring characteristic parameter information of a dental arch of a patient; calculating the characteristic parameter information of the dental arch of the patient, selecting a candidate dental arch correcting process matched with the calculation result from a database when the calculation result is not greater than a first preset threshold value, and designing a digital correcting scheme of teeth to be corrected according to the correcting process of the candidate dental arch;

when the calculation result is larger than a first preset threshold value, acquiring characteristic parameter information of a single tooth of a patient, calculating the characteristic parameter information of the single tooth, and screening out a correction target tooth; calculating and screening out the correction process of the candidate dental arch in a database according to the characteristic parameter information of the correction target tooth, and designing a digital correction scheme of the tooth to be corrected according to the correction process of the candidate dental arch.

Further preferably, the generating of the digital dental correction scheme of the current patient according to the dentition feature information specifically includes:

acquiring characteristic parameter information of a single tooth of a patient; calculating the characteristic parameter information of the single tooth, and comparing the calculation result with a second preset threshold value to screen out at least one corrected target tooth; selecting at least one tooth corrected candidate tooth data set matched with the correction target tooth from a database; acquiring the characteristic parameter information of the dental arch of the patient, combining the candidate tooth data set with the characteristic parameter information of the dental arch of the patient, and acquiring the parameter information of the dental arch of the patient after the dental arch is planned to be corrected; and correcting and arranging the correction target teeth by taking the correction target teeth as an initial state and taking the dental arch after the correction as a target state, and designing a digital correction scheme of the teeth to be corrected.

Further preferably, the method further comprises verifying the digital orthodontic scheme of the tooth to be orthodontic, and specifically comprises the following steps:

calculating the stress size and/or the moment size and the moment direction of the orthodontic target tooth by adopting a finite element algorithm for the movement amount of each orthodontic target tooth in the digital orthodontic scheme, and judging whether the stress size and/or the moment size and the moment direction are within a preset range; if so, outputting a digital correction scheme of the tooth to be corrected, which comprises the step-by-step information; if not, changing the first preset threshold or the second preset threshold, and screening the candidate dental arches or the candidate teeth again in the database for design.

Further preferably, before generating the digital dental correction scheme of the current patient according to the dentition feature information, the method further includes a bite relation classification step, specifically including:

acquiring occlusion information in the initial dentition model information;

comparing the occlusion information with occlusion information of a reference model to obtain occlusion classification information of an initial dentition;

and screening a corresponding occlusion type database according to the occlusion classification information.

Further preferably, before the shell-shaped dental appliance digital model is generated according to the digital dental appliance scheme, confirmation information of doctors and patients on the digital dental appliance scheme is acquired.

Further preferably, the acquiring of the confirmation information of the digital orthodontic scheme by the doctor and the patient specifically includes:

acquiring personal information of a patient, and generating patient file information containing the information of the demand of the patient on teeth to be corrected;

calling doctor information, and matching the doctor information with the archive information of the patient to be treated;

and pushing the matched doctor information to the patient, and acquiring confirmation information of the doctor and the patient on the digital correction scheme.

The invention also provides a preparation system of the shell-shaped dental appliance, which comprises the following steps: an information acquisition module, a shell-shaped tooth appliance design module and a preparation module,

the information acquisition module is used for acquiring initial dentition model information of the patient;

a shell-shaped tooth appliance design module, which adopts any one of the shell-shaped tooth appliance design methods to design and generate a shell-shaped tooth appliance digital model;

a preparation module configured to prepare a shell dental appliance based on the shell dental appliance digital model.

The invention also provides a preparation method of the shell-shaped tooth appliance, which comprises the following steps:

acquiring initial dentition model information of a patient, wherein the initial dentition model information at least comprises tooth information, dental arch information and occlusion information;

comparing the initial dentition model information with dentition information of a reference model to obtain dentition characteristic information of a patient, wherein the dentition characteristic information at least comprises characteristic parameter information of a single tooth and characteristic parameter information of a dental arch;

generating a digital tooth correction scheme of the current patient according to the dentition characteristic information;

generating a shell-shaped tooth appliance digital model according to the digital tooth appliance scheme;

and preparing the shell-shaped tooth appliance according to the shell-shaped tooth appliance digital model.

The design method, the preparation system and the preparation method of the shell-shaped tooth appliance provided by the invention have the following beneficial effects:

comparing the initial dentition model information with the dentition information of the reference model, obtaining dentition characteristic information of a patient and designing a digital tooth correcting scheme, thereby obtaining a shell-shaped tooth correcting device digital model; in the process of establishing the shell-shaped tooth appliance digital model, manual intervention is not needed, intelligent design is realized, and visual experience of a patient is improved from the perspective of the patient; the diagnosis and treatment parameters of the patient can be acquired on line in real time from the doctor end, the design time is saved, and the related data of the patient and the doctor can be comprehensively mastered more systematically from the supply end, so that the design of the appliance is more accurate.

Drawings

The above features, technical features, advantages and modes of realisation will be further described in the following detailed description of preferred embodiments of the shell-shaped dental appliance, a method of designing the shell-shaped dental appliance, a system for manufacturing the shell-shaped dental appliance and a method of manufacturing the shell-shaped dental appliance, which will be clearly understood by reference to the accompanying drawings.

FIG. 1 is a flow chart of a method of designing a shell-shaped dental appliance of the present invention;

FIG. 2 is a flow chart of a method of determining a tooth position arrangement of a tooth model to be tested according to the present invention;

FIG. 3 is a schematic view of the tooth arrangement of the tooth model of the present invention;

FIG. 4 is a schematic representation of the tooth arrangement of a further tooth model of the present invention;

FIG. 5 is a schematic view of the tooth arrangement of a further tooth model according to the present invention;

FIG. 6 is a schematic representation of the tooth position arrangement of a further tooth model of the present invention;

FIG. 7 is a flowchart of a digital dental appliance generation procedure according to the present invention;

FIG. 8 is a flowchart illustrating the generation of a digital dental appliance of the present invention;

FIG. 9 is a flowchart illustrating a digital dental appliance verification procedure according to the present invention;

FIG. 10 is a flow chart of interaction between a doctor and a patient in the digital dental appliance design of the present invention;

FIG. 11 is a functional block diagram of a shell dental appliance preparation system of the present invention;

FIG. 12 is a flow chart of a method of making a shell-shaped dental appliance of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.

The invention provides a design method, a preparation system and a preparation method of a shell-shaped tooth appliance, which are used for realizing automatic design and production of the shell-shaped tooth appliance.

First, the present embodiment provides a method for designing a shell-shaped dental appliance, and a flowchart thereof is shown in fig. 1, which specifically includes the following steps.

S110: initial dentition model information is obtained for a patient.

Specifically, intraoral data of the patient is first acquired based on the intraoral scanner, and then initial dentition model information of the patient is acquired based on the intraoral data.

Since the intraoral data acquired by the intraoral scanner is intraoral image information, it is necessary to perform an analysis process on the intraoral image information to obtain initial dentition model information of the patient, the initial dentition model information including at least tooth information, arch information, and bite information.

The specific analysis processing comprises the following steps:

acquiring an initial dentition model of a patient based on intraoral data, identifying the dentition arrangement of the initial dentition model, and determining the tooth label of each single tooth in the initial dentition model through the dentition arrangement;

acquiring relative position parameters of dental arches based on the dental position arrangement and the tooth labels, and measuring and establishing parameters of the dental arches;

and acquiring occlusion parameters of the maxillofacial region.

Wherein, recognizing the dentition arrangement of the initial dentition model specifically includes the steps, the flow chart of which is shown in fig. 2:

s1111: establishing a first prior model; the method comprises the steps of collecting the distance between every two adjacent teeth in an existing dentition model in a database and the number of missing teeth corresponding to the distance, and calculating probability distribution function values for the distances of different numbers of missing teeth;

s1112: acquiring the distance between two adjacent teeth in the initial dentition model;

s1113: the dentition of the initial dentition model is determined based on a hidden markov model.

In S1111, constructing a tooth state sequence vector of an existing dentition model, wherein the tooth state sequence vector is expressed by K; the tooth state sequenceColumn is vector K, K ═ K₁，k₂，k₃，...，k_2n-1]N is the number of teeth included in the existing tooth model; the vector K comprises 2n-1 elements, the odd elements take the tooth number, and the even elements take the missing tooth number between two adjacent teeth. The tooth state sequence K has 16! /[ n! X (16-n)!]A seed value, wherein! Represents a factorial operation, n is an integer from 0 to 16; each value of the tooth state sequence K respectively corresponds to a tooth position arrangement condition of the tooth model.

As an example, the tooth number is: suppose the tooth does not have the disappearance, and the upper right wisdom tooth is numbered 1 to 16 in proper order towards the upper left wisdom tooth direction, and the wisdom tooth is numbered 17 to 32 in proper order towards the lower left wisdom tooth direction under the right side. According to the tooth numbering, different tooth positions of the upper row of tooth models are arranged according to the tooth numbering modes shown in the figures 3 to 6. The circles in the figure represent actual remaining teeth, and the numbers in the circles are tooth numbers. The boxes in the figure represent the gaps between two adjacent remaining teeth, and the numbers in the boxes represent the number of missing teeth between two adjacent remaining teeth.

In S1112, a tooth observation sequence vector of the initial dentition model is constructed, where the tooth observation sequence is a vector B, B ═ X₁，b₁，X₂，b₂，X₃，b₃，...，b_n-1，X_n](ii) a Wherein X_iRepresenting the ith tooth, and expressed by a constant, wherein i is an integer from 1 to n; b_jRepresents the spacing value between two adjacent teeth, and j is an integer from 1 to n-1; and n is the number of teeth contained in the tooth model to be tested.

In S1111, a plurality of other prior models may be added to improve the calculation accuracy. If a second prior model is further added, the characteristic quantity of the characteristic position of each tooth in the existing tooth model can be collected, and the probability distribution function value is calculated for the characteristic quantity of at least the characteristic position of the tooth with the same number. Optionally, the second prior model further includes any one or more of characteristic quantities of characteristic area, volume and shape size of each tooth in the existing tooth model, and the characteristic quantities are of the same formatAnd respectively calculating probability distribution function values of the characteristic quantities of the characteristic area, the characteristic volume and the characteristic shape and the characteristic size of the tooth of the number. Then, at this time, X_iThe characteristic quantity of the ith tooth is expressed.

S1113, determining the dentition of the initial dentition model based on the hidden Markov model.

The determination of the dentition of the model of the dentition to be initialized based on the hidden Markov model is as follows: and calculating a probability value of each value of the tooth state sequence and the tooth observation sequence appearing at the same time based on the established one or more prior models, and taking the tooth position arrangement condition represented by the value of the tooth state sequence corresponding to the calculated maximum probability value as the tooth position of the initial dentition model.

Specifically, the probability P (B | K) of generating the tooth observation sequence B under each value of the tooth state sequence K and the state transition probability P (K) of forming the tooth state sequence K are calculated, and then the probability P (B | K) P (K) of simultaneously appearing each value of the tooth observation sequence B and the tooth state sequence K is calculated; and taking the tooth position arrangement condition represented by the value of the tooth state sequence K corresponding to the maximum probability value P (B, K) as the tooth position of the initial dentition model.

For example, P (B | K) is calculated using the following formula;

wherein [ ] represents the multiplication number, P (X)_i|k_2i-1) The expression number is k_2i-1Tooth appearance characteristic quantity X of_iThe probability of (d); p (b)_j|k_2j) Indicates that the number of missing teeth is k_2jWhen the distance between two adjacent teeth is b_jProbability of (A), P (X)_i|k_2i-1) A uniform distribution may be used.

For example, p (k) is calculated using the following formula;

wherein | < pi > represents a tandem multiplication number，P(k_2i+1|k_2i-1) The representative tooth number is k_2i-1The number of teeth appearing behind the teeth is k_2i+1The probability of tooth arrangement of teeth, P (k)_2i+1|k_2i-1) A uniform distribution may be used.

For example, P (B, K) is calculated using the following formula;

where max represents the maximum value, and Q represents the set of all values of the vector K.

The accurate calculation of the tooth position arrangement and the determination of the mark number are the basis for realizing the comparison of a single tooth with a corresponding tooth in a reference model subsequently, the reliable and correct guarantee of the subsequent tooth characteristic parameter information, and further the basis for calculating the dental arch parameter and the dental arch characteristic parameter and acquiring the occlusion parameter based on the tooth position arrangement on the tooth mark number.

S120: and comparing the initial dentition model information with the dentition information of the reference model to acquire the dentition characteristic information of the patient.

Wherein the reference model comprises at least one of a standard model, a big data fitting model and a classification model.

The standard model can be an Angle ideal normal dental model, namely a model which stores a whole set of teeth, wherein the teeth are orderly arranged in the upper dental arch and the lower dental arch, the relationship between the upper dental arch and the lower dental arch is completely correct, and the relationship between the upper dental arch and the lower dental arch is very ideal. The initial dentition of the patient can be compared and calculated using the ideal normal dental standard as a reference.

In a general orthodontic process, a big data fitting model can be used as a reference standard, the big data fitting model is fitted by taking individual normal dental jaws of modern people as a data source after being based on huge data statistics, and the fitting model can be continuously iterated and updated in the data process, so that the method has practical reference significance.

The classification model can adopt the standard of age and gender as the basis of classification to establish a corresponding model. For example, in the age stage of 7-13 years, because the stage is in the tooth replacement stage of children/adolescents, the ideal normal dental model is slightly deficient and cannot truly reflect the specific conditions of deciduous teeth and permanent teeth, the states of the teeth and the dental jaws of the children/adolescents in the age stage can be adopted to carry out big data fitting and calculation, and the reference standard suitable for the patients in the age stage is established; further, the states of the teeth and the dental jaw in the age stage of 13-19 years can be counted and fitted and calculated, and a reference standard suitable for the patient in the age stage is established; and analogy is carried out in sequence, an adult model is built, and the like. Furthermore, the reference standard suitable for the population can be established by dividing according to gender or performing tooth dental jaw statistics by combining age and gender, and then fitting and calculating.

In a specific implementation mode, the adaptive reference model can be selected according to age information, sex information and the like in the personal information of the patient, so that the reference standard is more pertinent, and the reference standard is more suitable for designing the subsequent appliance.

Correspondingly, the database in the invention can also be correspondingly set according to the classification of the reference model, and candidate data are selectively screened in the corresponding database in the digital appliance scheme generation, so that the appliance scheme design is more scientific.

Wherein, the dentition characteristic information at least comprises single tooth characteristic parameter information and dental arch characteristic parameter information.

Comparing the initial dentition model information with the dentition information of the reference model, specifically comparing the initial dentition model information with the single tooth information at the corresponding position in the reference model dentition information, and acquiring the characteristic parameter information of the single tooth of the patient; the characteristic parameter information of the single tooth at least comprises: and acquiring a distance deviation value of a single tooth along the direction of an arch line, a distance deviation value along the direction of a perpendicular line of the arch line in the plane of the arch and an angle deviation value of the tooth axis of each tooth and the tooth axis of the reference model along the direction of a normal line of the plane of the arch according to the tooth marks.

In order to facilitate the subsequent description of the characteristic parameter information of a single tooth, in this embodiment, the distance deviation value of the single tooth along the direction of the dental arch line is represented by c, the distance deviation value of the single tooth along the direction of the perpendicular line of the dental arch line in the dental arch plane is represented by d, and the angle deviation value of the tooth axis of the single tooth and the tooth axis of the reference model along the direction of the normal line of the dental arch plane is represented by e. Taking the above jaw permanent teeth as an example, the comparison with the standard model can be performed by using a difference value, and the positive and negative of the difference value further can represent the deviation direction of the reference model in the mesial-distal direction, the buccal direction, or the rotation direction of the tooth axis, which can be schematically recorded as follows:

table 1:

tooth marking	1	2	3	……	15	16
							c/mm	0	5	6	……	-9	-
d/mm	0	-8	4	……	5.2	-
							e/°	0	20	-7	……	15	-

Tooth number 1 is the third molar on the upper right with a deviation of 0, indicating that the tooth is substantially free of deviation from the reference model tooth number 1; as shown in the above table, if no data is found in number 16, it indicates that the third upper left molar is missing, where there is no wisdom tooth; referring to data for tooth # 2, which is deviated 5mm far in the arch plane in the direction of the arch line, 8mm to the lingual side in the direction of the perpendicular to the arch line in the arch plane, and the tooth axis is deviated 20 ° clockwise in the direction of the normal to the arch plane as compared with the reference model, each tooth can be identified by its reference number and three comparative coordinate deviation values; similarly, the comparison data of the whole single tooth can be obtained by performing corresponding comparison analysis on each tooth.

Comparing the initial dentition model information with the dentition information of the reference model, specifically comparing the initial dentition model information with the dental arch information in the reference model to obtain dental arch characteristic parameter information representing the dental arch of the patient; the arch characteristic parameter information includes an arch index, an arch length, an arch width, an arch curvature in the initial dentition model information, and at least one of an arch length, an arch width, and a deviation value of an arch curvature corresponding to the reference model in the initial dentition model information.

Based on the obtained intraoral data, the overall dentition condition is identified, the tooth position arrangement and the tooth labels are analyzed, and the initial dental arch information is further calculated. There may be various characteristic values for the calculation and acquisition of the basic comparison information, and this embodiment adopts: the length of the dental arch is recorded from the third molar (namely, the No. 1 tooth, if the No. 1 tooth is lost, the No. 2 tooth) of the first quadrant to the incisors (the No. 8 tooth) as the length in the first quadrant, the length in the second quadrant is calculated in the same way, the sum of the two lengths is the length of the upper dental arch, and the length in the same way is the length of the lower dental arch; the dental arch width can record a plurality of width values, in the embodiment, the distance value between the second molar (tooth No. 2) in the first quadrant and the second molar (tooth No. 15) in the second quadrant is used for calculation, and the distance value between corresponding cuspids or other teeth can be added for the data accuracy; further, the curvature r of the curve at the center point of the tooth corresponding to the center point of the arch curvature curve and the curve of the maxillary arch curve is calculated and recognized_xx(xx is a tooth mark), and selecting a point with the maximum curvature change as a characteristic point r of the curvature of the dentition_xx. Further, the present embodiment uses the curvature change of the cuspid as the reference for feature comparison.

The dental arch length in the initial dental array model information includes a maxillary dental arch length, a mandibular dental arch length, and dental arch widths, a maxillary dental arch width and a mandibular dental arch width, wherein for convenience of subsequently describing dental arch characteristic parameter information, in the embodiment, the maxillary dental arch length in the initial dental array model information is represented by S, the mandibular dental arch length is represented by T, the maxillary dental arch width is represented by U, the mandibular dental arch width is represented by V, and the dental arch curvature is represented by W. Further, the length, width and curvature of the dental arch corresponding to the reference model are compared to obtain the deviation degree value, and the dental arch characteristic parameter information can be represented by the deviation degree, that is, the deviation value of the length of the maxillary dental arch is represented by s, the deviation value of the length of the mandibular dental arch is represented by t, the deviation value of the width of the maxillary dental arch is represented by u, the deviation value of the width of the mandibular dental arch is represented by v, and the deviation value of the curvature of the dental arch is represented by w. That is, the parameters of the arch characteristics can be characterized by (s, t, u, v, w), as shown in Table 2 below.

Table 2:

dental arch characteristic parameters	Dentition 1	Dentition 2	Dentition 3	……
					Deviation value s of maxillary dental arch length	1	1.2	0.95	……
Mandibular dental arch length deviation value t	1	1.18	0.89	……
					Deviation value u of maxillary dental arch width	1	1.06	1.05	……
Mandibular dental arch width deviation value v	1	1.05	1.0	……
					Curvature feature point w	1	1.04	1.05	……

In the above table, the ratio of the corresponding parameter of the patient's dental arch to the corresponding parameter of the reference dental arch is used to characterize the salt work characteristic parameter. A deviation value closer to 1 indicates a closer dental arch to the reference model, a ratio greater than 1 indicates a greater length or width than the reference model, and a ratio less than 1 indicates a lesser width.

Various distance deviation values of the single tooth in the single tooth characteristic parameter information and the single tooth in the reference model, length, width and the like in the dental arch characteristic parameter information and deviation values of corresponding parameters in the reference model can adopt a ratio form, a difference form or other calculated comparison values. Through calculation, each tooth and the information of the dental arch where the tooth is located can have a group of numerical information on the mathematical model, and further the numerical information can be fed back to a large database for comparison.

In this embodiment, the teeth and dental arches of the patient are subjected to class-standardized processing by comparison with the reference model, and dentition characteristic information including tooth characteristic parameter information and dental arch characteristic parameter information can be used for representing and/or representing dentition conditions, pose conditions and the like of the patient in a database system. After class standardization processing is carried out, data storage, retrieval and comparison can be carried out more conveniently.

In order to simplify the data calculation and accurately match the reference model, the method can further comprise a step of classifying the occlusion relationship, which specifically comprises the following steps:

acquiring occlusion information in the initial dentition model information;

comparing the occlusion information with the occlusion information of the reference model to obtain occlusion classification information of the initial dentition; specifically, the occlusion relationship of the initial dentition can be roughly classified into an's category, an's category II and an's category III, and further, the classification can be finely performed on the basis of the's classification.

And screening a database of occlusion types corresponding to the initial dentition occlusion relation according to the occlusion classification information, and searching and comparing matched dentitions in the database to obtain equivalent searching and comparing effects after correction. Therefore, the calculation amount in the design scheme calculation process is greatly reduced.

The database used in generating the current patient's digitized dental appliance may be the original large database or the database of the corresponding bite type selected as described above.

S130: and generating a digital tooth correction scheme of the current patient according to the dentition characteristic information.

The present embodiments provide the following ways of generating a digitized dental appliance for a current patient:

a digital dental appliance is generated by the following process, and the flow chart is shown in FIG. 7:

s1311: and acquiring the characteristic parameter information of the dental arch of the patient.

Specifically, obtaining the deviation values of the dental arch length, the dental arch width and the dental arch curvature corresponding to the dental arch length, the dental arch width and the dental arch curvature of the initial dentition model information of the patient: s, t, u, v, w.

S1312: and calculating the characteristic parameter information of the dental arch of the patient.

In this step, a weighted average of the deviation values obtained in step S1311 is calculated, and the degree of deviation and/or deformity of the dental arch is represented by the magnitude of the weighted average.

S1313: and judging whether the calculation result is not larger than a first preset threshold value, if so, executing step S1314, and otherwise, executing step S1315.

The calculation result of S1312 is the degree of deviation of the dental arch, when the degree of deviation is smaller than a specific value, teeth arrangement may be performed with reference to the ideal dental arch, and if the degree of deviation is larger than the specific value, further calculation is required for each piece of dental data of the patient, so in this scheme, the specific value is defined as a first preset threshold, further, when the calculation result is smaller than or equal to the first preset threshold, the orthodontic process of the orthodontic patient that is similar to the patient is selected through step S1314, and if the calculation result is larger than the first preset threshold, the orthodontic target tooth of the patient needs to be selected through steps S1315-S1316.

S1314: and selecting the correction process of the candidate dental arch matched with the calculation result from the database, and designing a digital correction scheme of the tooth to be corrected according to the correction process of the candidate dental arch.

S1315: and acquiring the characteristic parameter information of the single tooth of the patient.

Specifically, a distance deviation value of a single tooth along the direction of an arch line in the initial dentition model information of the patient, a distance deviation value along the direction of a perpendicular line of the arch line in the plane of the arch, and an angle deviation value of a tooth axis of each tooth and a tooth axis of a reference model along the direction of a normal line of the plane of the arch are obtained: c. d, e.

S1316: and calculating the characteristic parameter information of the single tooth and screening out the teeth of the correction target.

For example, the deviation values of the individual teeth are sorted, the deviation degrees of the individual teeth are screened, and correction target teeth are screened, for example, 3 to 5 teeth are screened as correction target teeth.

S1317: calculating and screening out the correction process of the candidate dental arch in the database according to the characteristic parameter information of the correction target tooth, and designing the digital correction scheme of the tooth to be corrected according to the correction process of the candidate dental arch.

Similarly, the deviation values of the teeth to be corrected can be weighted and averaged, and the weighted and averaged deviation values are sequentially arranged in the database to screen out the correction process of the candidate dental arch.

The process of another digital orthodontic scheme is as follows, and the flow chart is shown in fig. 8:

s1321: and acquiring the characteristic parameter information of the single tooth of the patient.

Specifically, a distance deviation value of a single tooth in the direction of an arch line in the initial dentition model information of the patient, a distance deviation value in the direction of a perpendicular line of the arch line in the arch plane, and an angle deviation value of a tooth axis of each tooth from a tooth axis of the reference model in the direction of a normal line of the arch plane are obtained: c. d, e.

S1322: and calculating the characteristic parameter information of each single tooth.

Specifically, the deviation values c, d, and e obtained in step S1321 are weighted and averaged.

S1323: and judging whether the calculation result is greater than or equal to a second preset threshold value, if so, executing a step S1324, and if not, ending.

The calculation result of S1322 is the deviation value of each tooth, and accordingly, when the deviation value of each tooth is greater than a specific value, it is determined that the tooth needs to be corrected, so in this scheme, by defining the specific value as a second preset threshold value, and comparing the calculation result with the second preset threshold value, it is determined whether each tooth of the patient needs to be corrected, that is, when the calculation result of the tooth is greater than or equal to the second preset threshold value, it is determined that the tooth needs to be corrected, and when the calculation result of the tooth is less than the second preset threshold value, it is determined that the tooth does not need to be corrected, that is, the tooth is not the target corrected tooth, and when it is determined that each tooth of the patient does not need to be corrected through S1323, the correction process is completed.

S1324: the single tooth is determined to be a correction target tooth, and generally, at least one correction target tooth is determined through the judgment of S1323.

S1325: and selecting at least one tooth corrected candidate tooth data set matched with the correction target tooth from the database.

For example, the candidate tooth data set after one tooth or more matching with the tooth to be corrected is selected in a set value range of the deviation value from the tooth to be corrected, for example, the set value range of c may be [ -10, 10], the set value range of d may be [ -5, 5], the set value range of e may be [ -15, 15], and the candidate tooth data set after one tooth or more matching with the tooth to be corrected is selected in the set value range.

S1326: and acquiring the characteristic parameter information of the dental arch of the patient.

Specifically, deviation values of the maxillary dental arch length, the mandibular dental arch length, the maxillary dental arch width, the mandibular dental arch width and the dental arch curvature in the initial dentition model information of the patient are acquired: s, t, u, v, w.

S1327: and combining the candidate tooth data set with the dental arch characteristic parameter information of the patient to obtain the parameter information of the dental arch of the patient after the dental arch is planned to be corrected.

S1328: and correcting and arranging the corrected target teeth by taking the corrected target teeth as an initial state and taking the dental arch after correction as a target state, and designing a digital correction scheme of the teeth to be corrected.

It should be noted that the weighted average, the deviation maximum, and the like in the calculation are all screening conditions, and may be interchanged with each other, so as to derive various embodiments, which is not limited herein.

Because the first preset threshold and the second preset threshold related to above are different according to the calculation mode or the given parameters, the first preset threshold and the second preset threshold will produce larger changes, and the selection of the first preset threshold and the second preset threshold directly affects the results of the digital correction schemes designed in the above two schemes, further, in order to verify the generated digital correction scheme, the embodiment further includes the step of verifying the digital correction scheme of the tooth to be corrected:

calculating the stress size and/or the moment size and the moment direction of the orthodontic target tooth by adopting a finite element algorithm for the movement amount of each orthodontic target tooth in the digital orthodontic scheme, and judging whether the stress size and/or the moment size and the moment direction are within a preset range; if so, outputting a digital correction scheme of the tooth to be corrected, which comprises the step-by-step information; if not, correcting the first preset threshold value or the second preset threshold value, and screening similar dental arches or similar teeth again in the database for design.

The force applied to each tooth may be preset to be equal to or less than 60g, and the moment is a distance of force, where x represents a multiple, the magnitude of the force is related to the position of the action point, the impedance center, etc., after the distance from the action point to the impedance center is determined, the magnitude range of the moment is also determined, that is, the moment is equal to 60 distance, and the magnitude of the force applied to the orthodontic target tooth is verified by finite element analysis to determine whether the digital tooth orthodontic scheme is optimal, where the flowchart is shown in fig. 9, and specifically includes the following steps:

s1331: simulating a moving process of each correction target tooth in the digital tooth correction scheme from an initial state to a target state in each step;

s1332: determining the stress corresponding to the movement amount of each orthodontic target tooth by using a finite element analysis method;

s1333: judging whether the stress of each correction target tooth is less than or equal to 60g, if not, executing a step S1334, and if so, executing a step S1335;

s1334: correcting the first preset threshold or the second preset threshold, and screening similar dental arches or similar teeth again in the database for design;

s1335: and outputting the digital correction scheme of the teeth to be corrected, which comprises the distribution information.

Through the verification, the optimal digital tooth correcting scheme can be obtained.

S140: and generating a shell-shaped dental appliance digital model according to the digital dental appliance scheme.

In order to obtain the optimal shell-shaped dental appliance digital model, further, before the shell-shaped dental appliance digital model is generated, the method further includes obtaining confirmation information of the digital dental appliance scheme by the doctor and the patient, and specifically includes the steps, and the flowchart is as shown in fig. 10:

s141: and acquiring personal information of the patient, and generating patient file information containing the information of the demand of the patient on teeth to be corrected.

The patient profile information includes personal information of the patient and may also include specific requirement information of the patient for dental correction. The personal information at least comprises the name, age, sex, contact information and the like of the patient; medical preference information such as distance information, medical preference information, and the like can be further included. Still including the patient in the archives and treating the tooth demand information of correcting, include at least: the patient may take a desired picture through a smartphone, and enter personal information through a personal information entry, and the intraoral data scanning information of the patient may be obtained through an intraoral scanner or a CBCT (3D oral imaging system).

The patient's personal information described above can also be used to select a reference model, database, etc. that matches the personal information when designing the solution. For example, a reference model at a certain age stage may be used to calculate dentition feature information at a certain age stage.

S142: doctor information is called, the doctor information is matched with the archive information of the patient to be treated, and the matched doctor information is pushed to the patient.

The doctor information comprises doctor personal information, qualification information, evaluation information and the like, the doctor personal information comprises regions, languages, sexes and the like, the doctor qualification information comprises working years, qualification certificates, adequacy correction types and the like, and the doctor evaluation information comprises evaluation, industry evaluation, clinic evaluation and the like of corrected users.

Matching calculation and pushing are performed by combining the requirement information of the patient in the patient profile information and the doctor information, for example, the patient can be automatically pushed, and the pushing can be screened according to conditions.

Wherein, the automatic pushing process is as follows: classifying according to the requirement information of the patient according to certain requirement characteristics (such as the type of the orthodontic tooth), calling doctor information, calculating according to the requirement characteristics, and pushing N doctors before the relevancy to the patient.

The process of screening push according to conditions is: inputting requirement conditions, searching matched doctors according to the conditions, and pushing N doctors with the highest relevancy to the patient.

S143: and acquiring confirmation information of doctors and patients on the digital correction scheme.

After the matched doctor is pushed to the patient in step S142, the patient and the doctor can communicate through the interactive interface, and the patient can further provide detailed design requirements, such as whether to receive tooth extraction, whether to receive adjacent surface stripping, whether to receive combined anchorage planting, or some temporal requirements, such as planning an orthodontic cycle, or consultation of other medical problems.

The doctor designs the correction scheme according to the detailed requirement, and presents the scheme to the patient through the corresponding platform for the patient to confirm or select. In the design stage, the treatment plan can be designed subjectively by a doctor, can be designed automatically, and further can be modified by the doctor after the automatic design is carried out, and the platform provides animation demonstration of the whole treatment plan for the patient in a dynamic demonstration mode.

After the confirmation of the patient, a final correction scheme is presented to the patient, and the final correction scheme can include other information, such as correction cost, in addition to the correction scheme (correction method, correction process, correction cycle, and the like).

Based on the automated design method of the shell-shaped tooth appliance provided by the implementation, the communication between the doctor and the patient can be in a remote mode, so that the patient can obtain the tooth appliance scheme without going out of home or nearby, and the design scheme of the appliance can be obtained immediately after confirmation of the doctor and the patient.

The design method of the shell-shaped dental appliance provided by the embodiment at least has the following effects:

1) comparing the initial dentition model information with the dentition information of the reference model, obtaining dentition characteristic information of a patient and designing a digital tooth correcting scheme, thereby obtaining a shell-shaped tooth correcting device digital model; in the process of establishing the shell-shaped tooth appliance digital model, manual intervention is not needed, intelligent design is realized, and visual experience of a patient is improved from the perspective of the patient; the diagnosis and treatment parameters of the patient can be acquired on line in real time from the doctor end, the design time is saved, and the related data of the patient and the doctor can be comprehensively mastered more systematically from the supply end, so that the design of the appliance is more accurate.

2) Comparing the initial dentition model information with the single tooth information of the corresponding label in the reference model dentition information to obtain the characteristic parameter information of the single tooth of the patient and the characteristic parameter information of the dental arch representing the dental arch of the patient; the unified data form not only makes the storage, comparison and retrieval of patient data easier, but also brings convenience for classified statistics, automatic design and the like of cases. Based on statistics and analysis of big data, the shell-shaped tooth appliance digital model is more efficient and more accords with humanized design, and the shell-shaped tooth appliance made by the shell-shaped tooth appliance model enables a patient to have the best wearing comfort level.

3) In the initial dentition analysis, the tooth positions of the initial dentition model are determined by adopting a hidden Markov model, and each tooth is marked based on the tooth positions. Compared with manual numbering in the prior art, the automatic numbering is realized, the efficiency is high, the speed is high, and a good foundation is provided for automatic design. Accurate calculation of tooth position arrangement and determination of the labels provide a data basis for comparison of a single tooth and a corresponding tooth in a reference model, and tooth characteristic parameter information is more reliable when the tooth characteristic parameter information is further acquired.

4) And calculating the stress size and/or the moment size and the moment direction of the orthodontic target tooth by adopting a finite element algorithm for the orthodontic target tooth movement amount in the digital orthodontic scheme, judging whether the stress size and/or the moment size and the moment direction are within a preset range, and if not, adjusting the digital orthodontic scheme, so that the designed shell-shaped tooth appliance digital model is more suitable for individual patients.

5) Before the shell-shaped tooth appliance digital model is generated, confirmation of doctors and patients on the digital tooth appliance scheme is further obtained, the patients can select matched doctors in a remote mode, and the automatic tooth appliance scheme and the shell-shaped tooth appliance design scheme are consulted for the doctors. After the doctor confirms and the patient receives the shell-shaped tooth appliance, the design scheme of the shell-shaped tooth appliance is obtained immediately, the existing medical mode is changed, the conventional medical time is greatly shortened for the patient, and the working efficiency is greatly improved for the doctor. And the interaction and participation of the doctors and the patients can improve the cognition degree and the acceptance degree of the patients to the designed shell-shaped dental appliance.

The invention also provides a preparation system of the shell-shaped dental appliance, a functional block diagram of which is shown in fig. 11, and the preparation system comprises the following components: the device comprises an information acquisition module 1, a shell-shaped tooth appliance design module 2 and a preparation module 3.

The information acquisition module 1 is configured to acquire initial dentition model information of a patient, and may be any form of electronic receiving device; furthermore, it may be configured to acquire intraoral data of a patient, and further acquire initial dentition model information according to the intraoral data, in which case the information acquisition module 1 may be an intraoral scanner, that is, the intraoral data of the patient is acquired by means of intraoral scanning.

The shell-shaped dental appliance design module 2 is configured to obtain initial dentition model information of the patient through the information acquisition module 1, and to design and generate a shell-shaped dental appliance digital model by using the shell-shaped dental appliance design method provided by the present invention, and for a specific design process, please refer to the present invention, which is not described herein again.

The preparation module 3 is configured to prepare a shell-shaped dental appliance based on the shell-shaped dental appliance digital model.

In some embodiments, the preparation module 3 may be a 3D printer, and the preparation module 3 directly and integrally prints the shell-shaped dental appliance based on the digital model of the shell-shaped dental appliance.

In some embodiments, the preparation module 3 may also be a preparation method of hot-pressing film forming, for example, a corresponding dental model is generated based on a digital model of a shell-shaped dental appliance, and then a corresponding shell-shaped dental appliance is prepared based on the dental model by using a traditional hot-pressing film preparation process.

In the invention, a shell-shaped tooth appliance digital model can be generated by adopting a shell-shaped tooth appliance design method, so that the shell-shaped tooth appliance can be directly and quickly generated and prepared.

The invention also provides a preparation method of the shell-shaped dental appliance, and the flow chart is shown in fig. 12, and the preparation method specifically comprises the following steps.

S510: initial dentition model information is obtained for a patient.

The initial dentition model information includes at least tooth information, arch information, and bite information.

S520: and comparing the initial dentition model information with the dentition information of the reference model to acquire the dentition characteristic information of the patient.

The dentition characteristic information at least comprises single tooth characteristic parameter information and dental arch characteristic parameter information.

S530: and generating a digital tooth correction scheme of the current patient according to the dentition characteristic information.

S540: and generating a shell-shaped dental appliance digital model according to the digital dental appliance scheme.

S550: and preparing the shell-shaped tooth appliance according to the shell-shaped tooth appliance digital model.

For the detailed implementation of the steps S510 to S540, please refer to steps S110 to S140 of the present invention, which are not described herein in detail.

The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.