阅读说明：本技术 一种上颌骨缺损赝复体的制作方法及系统 (Method and system for manufacturing maxillary defect prosthesis ) 是由 周永胜 叶红强 孙玉春 刘云松 王子轩 于 2020-05-09 设计创作，主要内容包括：本申请公开了一种上颌骨缺损赝复体的全数字化设计和制作方法及系统,用以提高制作精度、质量和效率,缩短赝复体的制作周期,包括：获取上颌骨缺损三维数字模型；根据所述三维数字模型,进行模型观测并确定基牙的倒凹深度；根据所述基牙的倒凹深度,确定固位体；根据所述三维数字模型,确定大连接体和小连接体；根据所述三维数字模型,从数据库中选择人工牙,排列所述人工牙并确定所述人工牙的位置；根据所述人工牙、所述固位体、所述大连接体和所述小连接体确定所述上颌骨缺损赝复体的设计；根据所述上颌骨缺损赝复体的设计,通过增材制造法或者减材制造法,制作所述上颌骨缺损赝复体。本申请还公开了一种上颌骨缺损赝复体的全数字化设计和制作系统。(The application discloses full digital design and manufacturing method and system of maxillary defect prosthesis, which are used for improving manufacturing precision, quality and efficiency and shortening the manufacturing period of prosthesis and comprise the following steps: obtaining a maxilla defect three-dimensional digital model; according to the three-dimensional digital model, carrying out model observation and determining the undercut depth of the abutment; determining a retainer according to the undercut depth of the abutment; determining a large connector and a small connector according to the three-dimensional digital model; selecting artificial teeth from a database according to the three-dimensional digital model, arranging the artificial teeth and determining the positions of the artificial teeth; determining the design of the maxillary defect prosthesis according to the artificial tooth, the retainer, the large connector and the small connector; and manufacturing the maxillary defect prosthesis by an additive manufacturing method or a subtractive manufacturing method according to the design of the maxillary defect prosthesis. The application also discloses a full-digital design and manufacturing system of the maxillary defect prosthesis.)

1. A full-digital design and manufacturing method of a maxillary defect prosthesis is characterized by comprising the following steps:

obtaining a maxilla defect three-dimensional digital model;

determining the undercut depth of the abutment according to the three-dimensional digital model;

determining a retainer according to the undercut depth of the abutment;

determining a large connector and a small connector according to the three-dimensional digital model;

selecting artificial teeth from a database according to the three-dimensional digital model, arranging the artificial teeth and determining the positions of the artificial teeth;

determining the design of the maxillary defect prosthesis according to the artificial tooth, the retainer, the large connector and the small connector;

and manufacturing the maxillary defect prosthesis by an additive manufacturing method or a subtractive manufacturing method according to the design of the maxillary defect prosthesis.

2. The method of claim 1, wherein said obtaining a three-dimensional digital model of a maxillary defect comprises:

obtaining three-dimensional data of a maxillary defective cavity and a maxillary dentition through spiral CT scanning, and obtaining three-dimensional data of the maxillary dentition and a maxillary mucous membrane through intraoral scanning; obtaining a maxillary defect three-dimensional digital model through data registration and fusion according to the three-dimensional data of the maxillary defect cavity and dentition and the three-dimensional data of the maxillary dentition and the palatal mucosa; or

And (3) preparing a maxilla defect impression by a tray impression method, pouring a plaster model, and obtaining a maxilla defect three-dimensional digital model by a model scanner.

3. The method of claim 1, wherein said performing model observations from said three-dimensional digital model to determine undercut depths of abutments comprises:

introducing the three-dimensional digital model into dental Computer Aided Design (CAD) software, and establishing a design list of the upper jaw removable partial denture stent and/or the dental crown bridge;

and determining the undercut depth of the abutment by an average undercut method or an adjusted undercut method according to the three-dimensional digital model.

4. The method of claim 3, further comprising:

determining a clamping ring support table;

determining the undercut depth of the card arm tip according to the material made of the prosthesis;

the depth of the undercut reserved at the defect cavity part is determined according to whether the prosthesis needs to enter the tissue undercut.

5. The method of claim 1, wherein determining the retainers, the large linkers, and the small linkers further comprises:

determining design parameters of the snap ring, the support, the large connector and the small connector according to the manufacturing material of the prosthesis;

and setting the extension range of the large connector according to the extension range of the prosthesis base.

6. The method of claim 1, after determining the large and small connectors, further comprising:

on the polishing surface of the large connector, a closed boundary is created along the edge of the defect cavity, the buccal-lingual side of the alveolar ridge opposite to the artificial tooth and not in contact with the artificial tooth, and triangular grid data in the boundary are deleted;

creating a closed boundary at a gum curve of the artificial tooth and deleting triangular grid data within an artificial tooth cap ridge boundary;

and connecting the closed boundary at the artificial gum curve with the corresponding closed boundary on the large connector to form a prosthesis base, and determining the design of the integrated maxillary defect prosthesis.

7. The method of claim 6, further comprising:

selecting a part with larger volume in the prosthesis to form a new object;

shifting the surface normal of the new stopper object by a distance D1 along the reverse direction, turning the normal, and determining the design of the integrated hollow maxillary defect prosthesis by deleting, filling or smoothing the inner surface of the hollow part of the integrated hollow prosthesis;

wherein the offset distance D1 is determined according to the manufacturing material of the prosthesis stopper.

8. The method of claim 6, further comprising:

setting a line of demarcation between the obturator and the removable denture;

and determining a truncated cone-like structure protruding towards the removable denture part on the boundary line, so that the occluder part and the removable denture are embedded to determine the design of the split type maxillary defect prosthesis.

9. The method of claim 8, further comprising:

selecting a blocker to form a new object;

shifting the surface normal of the new object of the stopper by a distance D2 along the reverse direction, turning the normal, and determining the design of the split type hollow maxillary defect prosthesis by deleting, filling holes or smoothly forming the inner surface of the hollow part of the hollow stopper;

wherein the offset distance D2 is determined according to the manufacturing material of the prosthesis stopper.

10. A fully digital design and manufacturing system for a maxillary defect prosthesis is characterized by comprising:

the three-dimensional digital model acquisition subsystem is used for acquiring a maxillary defect three-dimensional digital model;

the CAD subsystem is used for obtaining the undercut depth according to the three-dimensional digital model, selecting the artificial tooth from a database, and designing the retainer, the large connector, the small connector and the base to obtain the design of the maxillary defect prosthesis;

the prosthesis manufacturing subsystem is used for manufacturing the maxillary defect prosthesis according to the design of the maxillary defect prosthesis;

the production system is used to implement the method according to one of claims 1 to 9.

Technical Field

The application relates to the technical field of oral and maxillofacial prosthesis, in particular to a manufacturing method and a system of a maxillary defect prosthesis.

Background

Maxillary defects often cause simultaneous defects of dentition and maxilla and often cause oral-nasal cavity punch-through, thereby affecting functions of chewing, swallowing, pronunciation and the like of patients. While only a few patients with a defective maxilla can be repaired by surgical reconstruction, most patients still need to be repaired by means of an prosthesis.

The manufacturing method of the maxillary defect prosthesis has the disadvantages of more complicated manufacturing method and flow, long period and larger accumulated error generated by each manufacturing step due to different materials of all components. If the maxillary bone defect is large, in order to reduce the weight of the prosthesis and achieve better retention and stabilization effects, the prosthesis is required to be made into a hollow prosthesis, and the manufacturing process is more complicated. For the split prosthesis, the occluder needs to be manufactured firstly, and after the split prosthesis is tried in the mouth of a patient properly, the impression is made again to manufacture the removable denture part, so that the patient has more times of diagnosis and a longer diagnosis and treatment period.

Disclosure of Invention

In view of the above technical problems, embodiments of the present application provide a fully digital design and manufacturing method and system for a maxillary defect prosthesis, so as to improve manufacturing accuracy, quality and efficiency and shorten the manufacturing period of the prosthesis.

On one hand, the full-digital design and manufacturing method of the maxillary defect prosthesis provided by the embodiment of the application comprises the following steps:

obtaining a maxilla defect three-dimensional digital model;

determining the undercut depth of the abutment according to the three-dimensional digital model;

determining a retainer according to the undercut depth of the abutment;

determining a large connector and a small connector according to the three-dimensional digital model;

selecting artificial teeth from a database according to the three-dimensional digital model, arranging the artificial teeth and determining the positions of the artificial teeth;

determining the design of the maxillary defect prosthesis according to the artificial tooth, the retainer, the large connector and the small connector;

and manufacturing the maxillary defect prosthesis by an additive manufacturing method or a subtractive manufacturing method according to the design of the maxillary defect prosthesis.

By the method, full-digital design and manufacture are realized, the design and manufacture process of the maxilla defect prosthesis can be simplified, the manufacture precision, quality and efficiency are improved, and the manufacture period of the prosthesis is shortened.

Optionally, the obtaining a three-dimensional digital model of the maxillary defect includes:

obtaining three-dimensional data of a maxillary defective cavity and a maxillary dentition through spiral CT scanning, and obtaining three-dimensional data of the maxillary dentition and a maxillary mucous membrane through intraoral scanning; obtaining a maxillary defect three-dimensional digital model through data registration and fusion according to the three-dimensional data of the maxillary defect cavity and dentition and the three-dimensional data of the maxillary dentition and the palatal mucosa; or preparing a maxillary defect impression by a tray impression method, pouring a plaster model, and obtaining a maxillary defect three-dimensional digital model by a model scanner.

Optionally, the determining the undercut depth of the abutment according to the three-dimensional digital model includes:

introducing the three-dimensional digital model into dental Computer Aided Design (CAD) software, and establishing a design list of the upper jaw removable partial denture stent and/or the dental crown bridge;

and determining the undercut depth of the abutment by an average undercut method or an adjusted undercut method according to the three-dimensional digital model.

Further, the manufacturing method of the maxillary defect prosthesis can further comprise the following steps:

determining a clamping ring support table;

determining the undercut depth of the card arm tip according to the material made of the prosthesis;

the depth of the undercut reserved at the defect cavity part is determined according to whether the prosthesis needs to enter the tissue undercut.

Optionally, after the determining the retainer, the large connecting body, and the small connecting body, the method further includes:

determining design parameters of the snap ring, the support, the large connector and the small connector according to the manufacturing material of the prosthesis;

and setting the extension range of the large connector according to the extension range of the prosthesis base.

Further, after the determining the large connecting body and the small connecting body, the method further includes:

on the polishing surface of the large connector, a closed boundary is created along the edge of the defect cavity, the buccal-lingual side of the alveolar ridge opposite to the artificial tooth and not in contact with the artificial tooth, and triangular grid data in the boundary are deleted;

creating a closed boundary at a gum curve of the artificial tooth and deleting triangular grid data within an artificial tooth cap ridge boundary;

and connecting the closed boundary at the artificial gum curve with the corresponding closed boundary on the large connector to form a prosthesis base, and determining the design of the integrated maxillary defect prosthesis.

Optionally, on the basis of the design of the integrated maxillary defect prosthesis, the prosthesis may further comprise:

selecting a part with larger volume in the prosthesis to form a new object;

shifting the surface normal of the new stopper object by a distance D1 along the reverse direction, turning the normal, and determining the design of the integrated hollow maxillary defect prosthesis by deleting, filling or smoothly forming the inner surface of the hollow part of the integrated hollow prosthesis;

wherein the offset distance D1 is determined according to the manufacturing material of the prosthesis stopper.

Optionally, on the basis of the design of the integrated maxillary defect prosthesis, the prosthesis may further comprise:

setting a line of demarcation between the obturator and the removable denture;

and determining a truncated cone-like structure protruding towards the removable denture part on the boundary line, so that the occluder part and the removable denture are embedded to determine the design of the split type maxillary defect prosthesis.

Optionally, on the basis of the design of the split maxillary defect prosthesis, the method may further include:

selecting a blocker to form a new object;

shifting the surface normal of the stopper by a distance D2 along the reverse direction, turning the normal, and determining the design of the split hollow maxillary defect prosthesis by deleting, filling or smoothly forming the inner surface of the hollow part of the hollow stopper;

wherein the offset distance D2 is determined according to the manufacturing material of the prosthesis stopper.

In another aspect, the present invention further provides a fully digital design and fabrication system for a maxillary defect prosthesis, comprising:

the three-dimensional digital model acquisition subsystem is used for acquiring a maxillary defect three-dimensional digital model;

the CAD subsystem is used for obtaining the undercut depth according to the three-dimensional digital model, selecting the artificial tooth from a database, and designing a retainer, a large connector and a small connector to obtain the design of the maxillary defect prosthesis;

the prosthesis manufacturing subsystem is used for manufacturing the maxillary defect prosthesis according to the design of the maxillary defect prosthesis;

the manufacturing system is used for realizing the manufacturing method of the maxillary defect prosthesis.

The method and the system for manufacturing the maxillary defect prosthesis provided by the invention replace the traditional complex, low-efficiency and complex prosthesis manufacturing method with the digital design and manufacturing method, realize the full-flow digital design and manufacture of the maxillary defect prosthesis and improve the manufacturing precision, quality and efficiency of the maxillary defect prosthesis.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic flow chart of a prosthesis manufacturing method in the prior art;

figure 2 is a schematic flow chart of a fully digital design and fabrication method of a maxillary defect prosthesis provided by an embodiment of the present application;

figure 3 is a schematic structural diagram of an integrated prosthesis provided in an embodiment of the present application;

figure 4 is a schematic structural view of another viewing angle of the one-piece prosthesis provided in embodiments of the present application;

figure 5 is a schematic structural diagram of a split prosthesis provided in an embodiment of the present application;

figure 6 is a schematic structural diagram of a fully digital design and fabrication system for a maxillary defect prosthesis according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Some of the words that appear in the text are explained below:

1. the term "and/or" in the embodiments of the present invention describes an association relationship of associated objects, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

2. In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 shows a method for manufacturing a bracket-type maxillary defect prosthesis in the prior art, which comprises the following steps:

s101, a clinician designs a prosthesis;

s102, preparing a tooth body;

s103, preparing a working die;

s104, pouring a gypsum working model and disinfecting;

s105, a technician manufactures a metal bracket, which comprises bracket wax pattern manufacturing, embedding casting, grinding and polishing and the like;

s106, the technician manufactures the constant base, and the method comprises the steps of manufacturing a base wax pattern, filling glue and the like;

s107, a doctor tries to wear the metal support and the constant base support clinically, an occlusion record is made, and an impression is made again and contains the constant base support;

s108, filling a model and disinfecting;

s109, the technician arranges the teeth and manufactures a base wax model;

s110, secondary boxing, glue filling, grinding and polishing;

and S111, disinfecting the prosthesis.

The manufacturing method and the process are complicated, the period is long, and the accumulated error generated in each manufacturing step is large. If the maxillary bone defect is large, the prosthesis needs to be made into a hollow prosthesis in order to reduce the weight of the prosthesis, and the manufacturing process is more complicated. For the split prosthesis, the occluder needs to be manufactured firstly, and after the split prosthesis is tried in the mouth of a patient properly, the impression is made again to manufacture the removable denture part, so that the patient has more times of diagnosis and a longer diagnosis and treatment period.

In view of the above technical problems, embodiments of the present application provide a method and a system for manufacturing a maxillary defect prosthesis, so as to improve manufacturing accuracy, quality and efficiency and shorten a manufacturing period of the prosthesis.

The maxillary defect prosthesis can be divided into an integrated maxillary defect prosthesis and a split maxillary defect prosthesis according to whether the maxillary defect prosthesis is split or not; the prosthesis can be divided into a hollow type maxillary defect prosthesis and a non-hollow type maxillary defect prosthesis according to whether the prosthesis is hollow or not. That is, the integrated maxillary defect prosthesis can be divided into an integrated hollow maxillary defect prosthesis and an integrated non-hollow maxillary defect prosthesis, and the split maxillary defect prosthesis can be divided into a split hollow maxillary defect prosthesis and a split non-hollow maxillary defect prosthesis.

The method and the system are based on the same application concept, and because the principles of solving the problems of the method and the system are similar, the implementation of the system and the method can be mutually referred, and repeated parts are not repeated.

Various embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the display sequence of the embodiment of the present application only represents the sequence of the embodiment, and does not represent the merits of the technical solutions provided by the embodiments.