阅读说明：本技术 计算机同步设计牙齿桩核、冠的全数字化设计方法 (Full-digital design method for synchronously designing tooth post core and tooth crown by computer ) 是由 张玮 谢雯静 李林 张宇航 明先庆 于 2021-08-30 设计创作，主要内容包括：本发明提供一种计算机同步设计牙齿桩核、冠的全数字化设计方法,对患牙同步完成桩道预备和全冠基牙预备,获得包括患牙的桩道和全冠基牙形态的硅橡胶印模；对印模扫描件建模；设计个性化桩核,参照STL文件切削制作数字化桩核；回到桩核设计之初改变桩核粘结剂间隙为负值,使设计输出的新桩核能够顺利穿入剩余牙体的数字化模型,从而拟合新桩核与剩余牙体为一体；设计全冠,实现牙齿桩核、冠的全数字化同步设计。该方法,能够实现计算机设计完成数字化桩核之后,在此基础上立刻设计全冠,在计算机水平,达到了桩核、牙体、全冠三者的密合,改善现有数字化桩核技术的不足,力求达到优化设计步骤,缩短患者桩核冠修复的周期,简化技师制作流程的目的。(The invention provides a full-digital design method for synchronously designing a tooth post core and a tooth crown by a computer, which is used for synchronously completing preparation of a post channel and preparation of a full crown abutment for an affected tooth to obtain a silicone rubber impression comprising the post channel of the affected tooth and the form of the full crown abutment; modeling the impression scan; designing an individualized pile core, and cutting and manufacturing a digital pile core according to the STL file; returning to the initial stage of pile core design, changing the gap of the pile core binder to be a negative value, so that the new pile core output by design can smoothly penetrate into the digital model of the residual tooth body, and the new pile core and the residual tooth body are fitted into a whole; and designing a full crown to realize the full-digital synchronous design of the tooth post core and the crown. The method can realize that the full crown is designed immediately on the basis after the digital pile core is designed by the computer, and the aims of achieving the close fit of the pile core, the tooth body and the full crown at the computer level, improving the defects of the existing digital pile core technology, striving to achieve the purposes of optimizing the design steps, shortening the period of repairing the pile core crown of a patient and simplifying the manufacturing process of a technician are fulfilled.)

1. A full-digital design method for synchronously designing tooth post cores and crowns by a computer comprises the following steps,

s1, synchronously completing the preparation of a pile path and the preparation of a full crown abutment for the affected tooth, and synchronously completing the mould taking of the affected tooth pile path and the full crown abutment by using a silicon rubber impression material to obtain a silicon rubber impression comprising the affected tooth pile path and the full crown abutment;

s2, scanning the silicon rubber impression obtained in the step S1 by using a three-dimensional scanner, modeling a scanned impression by using three-dimensional dental design software, and obtaining a digital negative model of the affected dental stump channel and the full crown abutment;

s3, selecting an impression scanning mode by three-dimensional dental design software to obtain a positive model of the residual tooth body of the affected tooth and the form of a post channel in the tooth root, then selecting a post core crown edge line by using the three-dimensional dental design software, selecting a post core positioning channel, designing a digital post core by referring to the form of the tooth root, storing a current post core design file and exporting the current post core design file to be an STL file;

s4, cutting and manufacturing the digital pile core by referring to the STL file;

the method is characterized in that: further comprising the steps of:

s5, returning to the step S3, the three-dimensional dental design software enters a model interface at the beginning of the post core design, changes the adhesive gap between the post core and the digital model of the residual tooth body into a negative value, commands the three-dimensional dental design software to automatically design and output a new designed post core on the residual tooth body, and the new post core penetrates into the digital model of the residual tooth body;

s6, verifying that the new pile core of S5 is completely consistent with the crown shape of the designed pile core in the step S3;

s7, merging and modeling the new post core and the residual tooth body obtained in the step S5 by using three-dimensional dental design software, lubricating the edge line at the model connection part of the digital post core and the residual tooth body, removing the undercut at the connection part of the prosthesis and the tooth body, smoothing the connection interface, providing a basis for designing the full crown prosthesis on the basis, and entering the next step;

s8, selecting crown margin lines for the tooth model combined and modeled in the step S7 by using three-dimensional dental design software, designing a full crown by referring to the shapes of adjacent teeth and contralateral teeth and considering occlusion of an adjacent surface and the contralateral teeth, and realizing full digital synchronous design of a tooth post core and a tooth crown.

2. The fully digital design method for synchronously designing the tooth post core and the tooth crown by the computer as claimed in claim 1, wherein the method comprises the following steps: in step S1, the silicone rubber impression material impression taking obtains impressions of the whole dentition including impressions of adjacent teeth, contralateral teeth and contra jaw teeth, in addition to impressions of post-preparation tunnels and full crown base teeth of the affected teeth.

3. The fully digital design method for synchronously designing the tooth post core and the tooth crown by the computer as claimed in claim 1, wherein the method comprises the following steps: in step S5, the pile-core binder gap is changed to a negative value: -0.005mm, -0.01 to-0.10 mm.

4. The fully digital design method for synchronously designing the tooth post core and the tooth crown by the computer as claimed in claim 1, wherein the method comprises the following steps: in step S5, the cement gap between the post-core and the digital model of the remaining tooth body is changed to a negative value, specifically, the cement gap between the post-core and the digital model of the remaining tooth body except the portion in contact with the dental crown is changed to a negative value, that is, the cement gap between the post-core and the lateral portion of the tooth root and the apical portion of the tooth root in the digital model of the remaining tooth body is changed to a negative value, and the cement gap value is changed without involving the crown surface of the post-core.

5. The fully digital design method for synchronously designing the tooth post core and the tooth crown by the computer according to any one of claims 1 to 4, which is characterized in that: in step S5, the output new core does not completely match the root contour of the core in step S3.

6. The fully digital design method for synchronously designing the tooth post core and the tooth crown by the computer as claimed in claim 5, wherein the method comprises the following steps: in step S6, after the designed new pile-core is output in step S5, the external form of the new pile-core is superimposed on the external form of the pile-core in step S3, and then the crown forms of the new pile-core and the pile-core in step S3 are verified to be completely superimposed, and the root external forms are not completely superimposed, so that the crown forms of the new pile-core and the pile-core are completely coincident.

7. The fully digital design method for synchronously designing the tooth post core and the tooth crown by the computer according to any one of claims 1 to 4, which is characterized in that: and step S9, outputting the STL file for cutting after the full crown design is finished.

Technical Field

The invention relates to a full-digital design method for synchronously designing a tooth post core and a tooth crown by a computer, belonging to the field of manufacturing of dental restorations.

Background

The digital method is a hotspot of research of oral clinicians in the field of oral repair at present, and has the following advantages: the method has the advantages of high precision, short processing time, individuation, digitalization and the like, and particularly, the CAD/CAM repairing mode is widely applied to clinic, such as the manufacture of restorations, such as full crown, veneering, inlays, metal supports, individualized implants and the like.

Compared with the traditional preformed glass fiber pile and resin core, the CAD/CAM pile core has the obvious advantages of better root canal adaptability and fracture resistance, and doctors do not need to stack the resin core clinically, thereby reducing the operation difficulty and saving the operation time. But the existing CAD/CAM pile core can not be directly processed and manufactured beside a chair, compared with a method for pre-forming a pile resin core, the frequency of the patient's return visit is increased, the period of the patient's pile core crown repair is prolonged, a technician can also waste some resources due to the repeated manufacture, the diagnosis and treatment steps of a clinician are complicated, and a lot of inconvenience is brought to the doctor and the patient.

The prior art realizes the manufacture of CAD/CAM pile cores and full crowns, but the prior technical scheme is manufactured in a plurality of times, and patients need to have a double-diagnosis at least, which is inconvenient. For example, chinese patent CN201210554467.1 discloses a method for preparing a dental personalized integrated all-ceramic post-core, which mainly includes directly scanning a damaged tooth after root canal preparation in the mouth by using a high-precision short-wavelength visible light scanner, designing and repairing a crown in computer aided design and manufacturing (CAD/CAM), firstly completing the design of the post-core integration, then designing and completing the design of the integrated all-ceramic post-core by using a crown back-cutting method, and completing the manufacturing of the integrated all-ceramic post-core by processing through a numerical control processing device. Although this patent has realized the preparation of digital stake core, still has equally, digital stake core design preparation wear in the mouth in, must redesign again and make full crown, the problem of stake core, full crown manufacturing in grades promptly: after the preparation of the post channel, the digital post core is designed and manufactured by scanning, after the cutting is finished, the post core is put into the mouth of the patient, the tooth body preparation is carried out, the tooth body is rescanned, the full crown prosthesis is designed and manufactured, and the full crown is put into the mouth of the patient, so that the number of times of the return visits is more.

The problems are considered and solved in the design and processing process of the full digital design method for synchronously designing the tooth post core and the tooth crown by the computer.

Disclosure of Invention

The invention aims to provide a full-digital design method for synchronously designing a tooth post core and a tooth crown by a computer, which solves the problem of synchronously designing the post core and the tooth crown for a patient, optimizes the diagnosis and treatment steps of a doctor, shortens the period of repairing the post core crown of the patient, simplifies the manufacturing process of a technician, avoids resource waste caused by manufacturing for times, and further provides a better basis for establishing a more harmonious relationship between the doctor and the patient.

The technical solution of the invention is as follows:

a full-digital design method for synchronously designing tooth post cores and crowns by a computer comprises the following steps,

s1, synchronously completing the preparation of a pile path and the preparation of a full crown abutment for the affected tooth, and synchronously completing the mould taking of the affected tooth pile path and the full crown abutment by using a silicon rubber impression material to obtain a silicon rubber impression comprising the affected tooth pile path and the full crown abutment;

s2, scanning the silicon rubber impression obtained in the step S1 by using a three-dimensional scanner, modeling a scanned impression by using three-dimensional dental design software, and obtaining a digital negative model of the affected dental stump channel and the full crown abutment;

s3, selecting an impression scanning mode by three-dimensional dental design software to obtain a positive model of the residual tooth body of the affected tooth and the form of a post channel in the tooth root, then selecting a post core crown edge line by using the three-dimensional dental design software, selecting a post core positioning channel, designing a digital post core by referring to the form of the tooth root, storing a current post core design file and exporting the current post core design file to be an STL file;

s4, cutting and manufacturing the digital glass fiber pile core according to the STL file;

further comprising the steps of:

s5, returning to the step S3, the three-dimensional dental design software enters a model interface at the beginning of the post core design, changes the adhesive gap between the post core and the digital model of the residual tooth body into a negative value, commands the three-dimensional dental design software to automatically design and output a new designed post core on the residual tooth body, and the new post core penetrates into the digital model of the residual tooth body;

s6, verifying that the new pile core of S5 is completely consistent with the crown shape of the designed pile core in the step S3;

s7, merging and modeling the new post core and the residual tooth body obtained in the step S5 by using three-dimensional dental design software, lubricating the edge line at the model connection part of the digital post core and the residual tooth body, removing the undercut at the connection part of the prosthesis and the tooth body, smoothing the connection interface, providing a basis for designing the full crown prosthesis on the basis, and entering the next step;

s8, selecting crown margin lines for the tooth model combined and modeled in the step S7 by using three-dimensional dental design software, designing a full crown by referring to the shapes of adjacent teeth and contralateral teeth and considering occlusion of an adjacent surface and the contralateral teeth, and realizing full digital synchronous design of a tooth post core and a tooth crown.

Further, in step S1, the impression of the silicone rubber impression material is obtained, in addition to the impression of the post-preparation post canal and the full crown abutment configuration of the affected tooth, the impression of the entire dentition is obtained, including the impressions of the adjacent teeth, the contralateral teeth and the contrajaw teeth.

Further, in step S5, the core binder gap is changed to a negative value: -0.005mm, -0.01 to-0.10 mm.

Further, in step S5, the cement gap between the post-core and the digital model of the remaining dental body is changed to a negative value, specifically, the cement gap between the post-core and the digital model of the remaining dental body except the portion in contact with the crown is changed to a negative value, that is, the cement gaps between the post-core and the lateral portion and the apical portion of the tooth root in the digital model of the remaining dental body are changed to a negative value, and the cement gap value is changed without involving the crown surface of the post-core.

Further, in step S6, the new core output in step S5 does not completely conform to the root profile of the core in step S3.

Further, in step S6, after the designed new pile core is output in step S5, the external shape diagram of the new pile core is superimposed on the external shape diagram of the pile core in step S3, and then the comparison verifies that the crown form of the new pile core is completely superimposed on the crown form of the pile core in step S3, and the root external shapes are not completely superimposed, so that the crown forms of the new pile core and the pile core are completely coincident.

Further, step S9 is included, after the full crown design is completed, the STL file is output for machining.

The invention has the beneficial effects that: the full-digital design method for synchronously designing the tooth post core and the tooth crown by the computer solves the technical difficulty of integrating fitting of the residual tooth body and the post core by changing the gap of the binder, and can realize full-digital synchronous design of the post core and the tooth crown. The method achieves the close fit of the pile core, the tooth body and the full crown at the computer level, can overcome the technical problem of synchronously designing the pile core and the full crown at one time by the computer, overcomes the defect of complex manufacturing process of the existing digital pile core technology, and strives to achieve the purposes of optimizing the design steps, shortening the period of repairing the pile core crown of a patient and simplifying the manufacturing process of a technician.

Drawings

Fig. 1 is a schematic flow chart of a full digital design method for synchronously designing a tooth post core and a tooth crown by a computer according to an embodiment of the invention.

Fig. 2 is an explanatory diagram of the embodiment in which the clearance between the adhesive of the core and the digitized model of the remaining tooth is changed to a negative value in step S5.

Fig. 3 is a schematic illustration of the embodiment in which step S6 verifies that the new peg core obtained in step S5 completely conforms to the only crown shape of the finished peg core designed in step S3, wherein (a) is a schematic view of the buccal-lingual cross section of the new peg core obtained in step S5, (b) is a schematic view of the buccal-lingual cross section of the peg core designed in step S3, and (c) is a schematic view of the comparison of the buccal-lingual cross section of the new peg core obtained in step S5 with the peg core designed in step S3.

Fig. 4 is an explanatory diagram of the full digital design method for synchronously designing the tooth post core and the tooth crown by the computer in the embodiment.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Examples

A full-digital design method for synchronously designing tooth post core and tooth crown by computer, as shown in figure 1 and figure 4, comprises the following steps,

s1, synchronously completing the preparation of the pile path and the preparation of the full crown abutment for the affected tooth, and synchronously completing the preparation of the pile path and the full crown abutment for the affected tooth by using a silicon rubber impression material and then taking the impression to obtain the silicon rubber impression with the shapes of the pile path and the full crown abutment for the affected tooth. In step S1, the silicone rubber impression material impression taking obtains impressions of the whole dentition including impressions of adjacent teeth, contralateral teeth and contra jaw teeth, in addition to impressions of post-preparation tunnels and full crown base teeth of the affected teeth.

S2, scanning the silicon rubber impression obtained in the step S1 by using a three-dimensional scanner, modeling a scanned impression by using three-dimensional dental design software, and acquiring a digital negative model of the form of the affected dental stump channel and the full crown abutment;

s3, selecting an impression scanning mode by three-dimensional dental design software to obtain a positive model of the residual tooth body of the affected tooth and the form of a post channel in the tooth root, then selecting a post core crown edge line by using the three-dimensional dental design software, selecting a post core positioning channel, designing a digital post core by referring to the form of the tooth root, storing a current post core design file and exporting the current post core design file to be an STL file;

s4, cutting and manufacturing the digital glass fiber pile core according to the STL file;

further comprising the steps of:

referring to fig. 2, S5, the three-dimensional dental design software returning to step S3 enters the interface of the prototype at the beginning of the post-core design, changes the adhesive gap between the post-core and the digital model of the remaining tooth to negative value, and instructs the three-dimensional dental design software to automatically design and output a new post-core designed on the remaining tooth, and the new post-core penetrates into the digital model of the remaining tooth.

In step S5, the negative value of the pile core binder gap is preferably changed as follows: -0.005mm, -0.01 to-0.10 mm, which enables the new core of the design output to penetrate into the digital model of the remaining tooth body. As shown in fig. 2, the cement clearance between the post-core and the digital model of the remaining tooth body is changed to be negative, specifically, the cement clearance between the post-core and the digital model of the remaining tooth body except for the part in contact with the crown is changed to be negative, that is, the cement clearance between the post-core and the lateral part of the tooth root and the apical part of the tooth root in the digital model of the remaining tooth body is changed to be negative, and the cement clearance value is changed without involving the crown surface of the post-core.

As shown in fig. 3, S6, the verification step S5 shows that the new core completely conforms to the crown-only form of the designed core in step S3. In step S5, the output new core does not completely match the root contour of the core in step S3. In step S5, after outputting the designed new pile core, as shown in fig. 3(b), the external form of the new pile core is superimposed on the external form of the pile core in step S3, as shown in fig. 3(a), and then the comparison verifies that the crown form of the new pile core is completely superimposed on the crown form of the pile core in step S3, and the root external forms are not completely superimposed, and only the crown forms of the new pile core and the pile core are completely coincident, as shown in fig. 3(c), when the new pile core obtained in step S5 is compared with the pile core designed in step S3, the schematic cross-sectional view passing through any central axis is used for comparison. In fig. 3, (a) and (b) are sectional views showing buccal and lingual directions of the peg core, respectively, and fig. 3(c) is a sectional view showing buccal and lingual directions of the peg core.

In the step S6, by verifying that the shapes of the crown parts of the two are completely consistent, the only connection surface between the post core and the full crown is the crown surface of the post core, and since the root space value of the post core is changed in the step S5, the root shape of the new post core changes relative to the post core in the step S3, but the crown surface of the new post core does not change because the root space value of the post core does not relate to the binder, so that the verification of the real feasibility of the synchronous design of the tooth post core and the crown can be realized, and the effective use of the design can be ensured.

S7, merging and modeling the new post core and the residual tooth body obtained in the step S5 by using three-dimensional dental design software, lubricating the edge line at the model connection part of the digital post core and the residual tooth body, removing the undercut at the connection part of the prosthesis and the tooth body, smoothing the connection interface, providing a basis for designing the full crown prosthesis on the basis, and entering the next step;

s8, selecting crown margin lines for the tooth model combined and modeled in the step S7 by using three-dimensional dental design software, designing a full crown by referring to the shapes of adjacent teeth and contralateral teeth and considering occlusion of an adjacent surface and the contralateral teeth, and realizing full digital synchronous design of a tooth post core and a tooth crown.

And S9, outputting the STL file for cutting after the full crown design is finished.

In an embodiment, the three-dimensional scanner is preferably a 3shape D2000 scanner. The three-dimensional Dental design software is preferably 3shape Dental System software.

The full-digital design method for synchronously designing the tooth post core and the tooth crown by the computer solves the technical difficulty of integrating fitting of the residual tooth body and the post core by changing the gap of the binder, and can realize full-digital synchronous design of the post core and the tooth crown. The method achieves the close fit of the pile core, the tooth body and the full crown at the computer level, can overcome the technical problem of synchronously designing the pile core and the full crown at one time by the computer, overcomes the defect of excessive patient return visit times in the existing digital glass fiber pile core technology, and strives to achieve the purposes of optimizing the design steps, shortening the period of repairing the pile core crown of the patient and simplifying the manufacturing process of a technician.

The full-digital design method for synchronously designing the tooth post core and the tooth crown by the computer aims at the problem that three-dimensional dental design software cannot identify that a male mold model of a digital post core and a residual tooth body which are designed in S3 is integrated, and the gap of a post core binder is set to be a negative value by returning to a generation interface at the beginning of the post core design, so that the post core is not separated from the residual tooth body after being designed, and can smoothly penetrate into the tooth body to be completely in place and be matched with the residual tooth body, at the moment, the software can identify that the digital post core and the residual tooth body are integrated, and then the tooth crown is designed on the basis.

TABLE 1 description of the comparison of the superiority and inferiority of the process of the examples with the prior art process

As shown in the above table 1, in the full-digital design method for synchronously designing the tooth post core and the tooth crown by using the computer, the full crown can be designed immediately after the digital post core is designed by using the computer, so that the conventional method is not required: after the preparation of the post channel, the digital post core is designed and manufactured by scanning, after the cutting is finished, the post core is put into the mouth of the patient, then the tooth body preparation is carried out, then the tooth body is rescanned, the full crown prosthesis is designed and manufactured, and then the full crown is put into the mouth of the patient, thereby saving the number of times of the re-diagnosis of the patient.

The above embodiments are merely illustrative of the technical idea of the present invention, and the technical idea of the present invention is not limited thereto, and any modifications made on the technical scheme according to the technical idea of the present invention fall within the scope of the present invention.