CN113813057B - Full-digital design method for synchronously designing tooth post core and tooth crown by computer - Google Patents

Abstract

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 post channel preparation and full crown abutment preparation on an affected tooth to obtain a silicone rubber impression comprising a post channel of the affected tooth and a full crown abutment shape; modeling the impression scanner; 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.

Description

Full digital design method of computer synchronous design of tooth post core and crown

technical field

The invention relates to an all-digital design method for synchronously designing tooth post cores and crowns by a computer, and belongs to the field of dental prosthesis production.

Background technique

Digital methods are currently a hot spot for dental clinicians in the field of oral restoration. They have many advantages: high precision, short processing time, personalization, digitalization, etc., especially the CAD/CAM restoration method, which has been widely used in clinical practice, such as Production of full crowns, veneers, inlays, metal brackets, personalized implants and other restorations.

CAD/CAM post cores have obvious advantages over traditional preformed glass fiber posts + resin cores, such as better root canal adaptability and fracture resistance, and doctors do not need to accumulate resin cores clinically, which reduces the difficulty of operation. Operating time is saved. However, at present, CAD/CAM posts and cores cannot be processed directly at the chairside. Compared with the method of prefabricated resin cores, the number of follow-up visits of patients is increased, and the cycle of post and core crown restorations for patients is prolonged. The waste of resources and the complicated diagnosis and treatment steps of clinicians have brought a lot of inconvenience to doctors, patients, and technicians.

The existing technology has realized the production of CAD/CAM posts and cores and full crowns, but the current technical solutions are all produced in batches, and patients need to return for at least two visits, which is inconvenient. For example, Chinese patent CN201210554467.1 discloses a method for preparing a dental personalized integrated all-ceramic post and core, which mainly uses a high-precision short-wavelength visible light scanner to directly scan the defective teeth after root canal preparation in the mouth, and uses computer-aided design. And production (CAD/CAM) crown restoration design, first complete the design of the post-core integration, and then use the crown back-cutting method to design the integrated all-ceramic post-core design, and complete the integrated all-ceramic post-core through CNC processing equipment production. Although this patent realizes the production of digital post and core, there is also the problem that after the digital post and core are designed and manufactured and worn in the mouth, the full crown must be redesigned and manufactured again, that is, the post and core and the full crown are produced in stages: after the pile road is prepared , scan and design and make a digital post and core. After the cutting is completed, put the post and core in the patient's mouth, and then carry out tooth preparation. After re-scanning the tooth, design and make a full crown restoration, and then put the full crown in the patient's mouth. resulting in more follow-up visits.

The above-mentioned problems should be considered and solved in the design and processing process of the fully digital design method of computer synchronous design of tooth posts, cores and crowns.

Contents of the invention

The purpose of the present invention is to provide a fully digital design method for synchronous design of post-core and crown by computer, to solve the problem of how to realize synchronous design of post-core and full crown for patients, to optimize the doctor's diagnosis and treatment steps, and to shorten the restoration of post-core and crown for patients. cycle, simplify the production process of technicians, avoid the waste of resources caused by batch production, and provide a better foundation for establishing a more harmonious relationship between doctors and patients.

Technical solution of the present invention is:

A fully digital design method for synchronous computer design of tooth posts and crowns, comprising the following steps,

S1. Simultaneously complete post preparation and full crown abutment preparation for the affected tooth, and use silicone rubber impression material to simultaneously complete the impression taking of the post and full crown abutment of the affected tooth, and obtain post and full crown abutment teeth including the affected tooth Morphological silicone rubber impression;

S2. Use a three-dimensional scanner to scan the silicone rubber impression obtained in step S1, use a three-dimensional dental design software to model the scanned copy of the impression, and obtain a digital negative model of the affected tooth post and full crown abutment;

S3. Select the "impression scan" mode in the 3D dental design software to obtain the positive model of the remaining tooth and the internal pile shape of the tooth root, and then use the 3D dental design software to select the edge line of the crown of the post core and the post The core is in place, refer to the shape of the tooth root, design the digital post and core, save the current post and core design file and export it as an STL file;

S4, refer to the STL file to cut and make the digital glass fiber post and core;

Also includes the following steps:

S5, back to step S3, the three-dimensional dental design software enters the model interface interface at the beginning of the post-core design, changes the adhesive gap of the digital model of the post-core and the remaining tooth to a negative value, and orders the three-dimensional dental design software Automatically design and output the designed new post and core on the body, and this new post and core penetrates into the digital model of the remaining tooth;

S6, verify that the new post and core of S5 is completely consistent with only the crown portion of the post and core designed in step S3;

S7. Use the three-dimensional dental design software to merge and model the new post core + remaining tooth obtained in step S5, lubricate the edge line of the joint between the digital post core and the remaining tooth model, and make the undercut at the joint between the restoration and the tooth Removed, the connection interface is smooth, providing a basis for designing a full crown restoration on top of this, and entering the next step;

S8. Use the 3D dental design software to select the crown edge line for the tooth model after the combined modeling in step S7, refer to the shape of the adjacent teeth and the contralateral teeth, and consider the occlusion of the adjacent surface and the opposing teeth, design the full crown, and realize the tooth post Full digital synchronous design of core and crown.

Further, in step S1, the silicone rubber impression material is used to obtain impressions of the entire dentition, including adjacent teeth, contralateral Impressions of teeth and opposing teeth.

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

Further, in step S5, change the adhesive gap between the post core and the digital model of the remaining tooth body to a negative value, specifically, change the adhesive gap between the post core and the digital model of the remaining tooth body except for the part in contact with the crown. The cement gap is a negative value, that is, the cement gap between the post core and the tooth root side and root tip in the digital model of the remaining tooth body is a negative value, and the change of the cement gap value does not involve the coronal surface of the post core .

Further, in step S6, the new post and core output in step S5 is not completely consistent with the shape of the root of the post and core in step S3.

Further, in step S6, after outputting the designed new post and core in step S5, after superimposing the outline drawing of the new post and core with the outline drawing of the post and core in step S3, compare and verify the shape of the crown of the new post and core and If the crown shapes of the post and core in step S3 are completely coincident, and the root shapes are not completely coincident, then the crown shapes of the two are completely consistent.

Further, step S9 is also included, after the full crown design is completed, an STL file is output for cutting and manufacturing.

The beneficial effects of the present invention are: the full digital design method of the computer synchronously designing tooth posts and crowns can solve the technical difficulty of fitting the rest of the teeth and the posts and cores by changing the gap between the adhesives, and can realize Full digital synchronous design of post core and crown. This method, at the computer level, achieves the close bonding of the post core, the tooth body, and the full crown, which can overcome the technical difficulty of synchronously designing the post core and the full crown by the computer at one time, and improve the shortcomings of the complicated production process of the existing digital post core technology. , and strive to achieve the purpose of optimizing the design steps, shortening the period of post-core crown restoration for patients, and simplifying the production process of technicians.

Description of drawings

Fig. 1 is a schematic flowchart of a fully digital design method for synchronous computer design of tooth posts and crowns according to an embodiment of the present invention.

Fig. 2 is a schematic illustration of changing the adhesive gap of the digital model of the post core and the remaining tooth body to a negative value in step S5 in the embodiment.

Fig. 3 is an explanatory schematic diagram illustrating that only the coronal shape of the new post core obtained in step S6 verification step S5 is completely consistent with that of the post core designed in step S3 in the embodiment, wherein (a) is a schematic diagram of the buccal-lingual cross-section of the new post core obtained in step S5 , (b) is a schematic diagram of the buccal-lingual section of the post core designed in step S3, and (c) is a schematic diagram of the buccal-lingual section comparison between the new post core obtained in step S5 and the post core designed in step S3.

Fig. 4 is an explanatory schematic diagram of a fully digital design method for synchronously designing tooth post cores and crowns by computer in the embodiment.

Detailed ways

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

Example

A fully digital design method for synchronous computer design of tooth posts and cores and crowns, as shown in Figure 1 and Figure 4, comprising the following steps,

S1. Simultaneously complete the post preparation and full crown abutment preparation of the affected tooth, and use the silicone rubber impression material to simultaneously complete the post preparation and full crown abutment tooth preparation of the affected tooth, and obtain the impression including the post post and full crown abutment of the affected tooth Silicone impression of tooth morphology. In step S1, the silicone rubber impression material is used to obtain an impression of the entire dentition, including adjacent teeth, contralateral teeth, and opposite Impression of jaw teeth.

S2. Use a three-dimensional scanner to scan the silicone rubber impression obtained in step S1, use three-dimensional dental design software to model the scanned copy of the impression, and obtain a digital negative model of the shape of the affected tooth post and full crown abutment;

S3. Select the "impression scan" mode in the 3D dental design software to obtain the positive model of the remaining tooth and the internal pile shape of the tooth root, and then use the 3D dental design software to select the edge line of the crown of the post core and the post The core is in place, refer to the shape of the tooth root, design the digital post and core, save the current post and core design file and export it as an STL file;

S4, refer to the STL file to cut and make the digital glass fiber post and core;

Also includes the following steps:

As shown in Figure 2, S5, back to step S3, the 3D dental design software enters the die interface interface at the beginning of the post core design, changes the adhesive gap of the digital model of the post core and the remaining tooth to a negative value, and commands the 3D dental design The software automatically designs and outputs a new designed post and core on the remaining tooth, and this new post and core penetrates into the digital model of the remaining tooth.

In step S5, the post-core adhesive gap is changed to a negative value, preferably -0.005mm--0.10mm or -0.01--0.10mm, so that the new post-core designed and output can penetrate into the digital model of the remaining tooth body. As shown in Figure 2, change the adhesive gap between the post core and the digital model of the remaining tooth to a negative value, specifically, change the adhesive gap between the post core and the digital model of the remaining tooth except for the part in contact with the crown negative value, that is, the post-core and the gap between the root side and root tip in the digital model of the remaining tooth are negative, and the change of the cement gap value does not involve the coronal surface of the post-core.

As shown in Fig. 3, S6, verify that the new post core in step S5 is exactly the same as only the crown portion of the post core designed in step S3. In step S5, the outputted new post and core are not completely consistent with the shape of the root of the post and core in step S3. In step S5, after outputting the new post and core of design, as shown in Figure 3 (b), the outline drawing of the new post and core and the outline drawing of the post and core in step S3, as shown in Figure 3 (a), are superimposed, and compared To verify that the crown shape of the new post-core is completely coincident with the crown shape of the post-core in step S3, and the root shape is not completely coincident, only the crown shapes of the two are completely consistent, as shown in Figure 3 (c), Figure 3 ( c) is a schematic diagram of the comparison between the new post and core obtained in step S5 and the post and core designed in step S3, using any section crossing the central axis. In Fig. 3, (a) and (b) are respectively buccal and lingual cross-sectional views of the post and core, and Fig. 3 (c) is a buccal and lingual cross-sectional view of the post and core.

In step S6, by verifying that the crown shapes of the two are completely consistent, the only connecting surface between the post core and the full crown is the crown surface of the post core. Since the root gap value of the post core changes in step S5, the root of the new post core The shape of the post and core in step S3 changes, but the coronal surface of the new post and core does not change because it does not involve the adhesive gap value, which can realize the feasibility verification of the synchronous design of the tooth post and core, and ensure that Designed to be effective and usable.

S7. Use the three-dimensional dental design software to merge and model the new post core + remaining tooth obtained in step S5, lubricate the edge line of the joint between the digital post core and the remaining tooth model, and make the undercut at the joint between the restoration and the tooth Removed, the connection interface is smooth, providing a basis for designing a full crown restoration on top of this, and entering the next step;

S8. Use the 3D dental design software to select the crown edge line for the tooth model after the combined modeling in step S7, refer to the shape of the adjacent teeth and the contralateral teeth, and consider the occlusion of the adjacent surface and the opposing teeth, design the full crown, and realize the tooth post Full digital synchronous design of core and crown.

S9. After the crown design is completed, output the STL file for cutting and manufacturing.

In an embodiment, the 3D scanner is preferably a 3shapeD2000 scanner. 3D dental design software is preferably 3shapeDental System software.

This kind of full digital design method of computer synchronous design of tooth posts, cores and crowns solves the technical difficulty of fitting the remaining teeth and posts and cores by changing the gap between the adhesives, and can realize full digital synchronous design of posts, cores and crowns. . This method, at the computer level, achieves the tight fit of the post-core, the tooth, and the full crown, which can overcome the technical difficulty of synchronously designing the post-core and the full crown at one time by the computer, and improves the patient's follow-up visit in the existing digital fiberglass post-core technology. Insufficient of too many times, strive to achieve the purpose of optimizing the design steps, shortening the period of the patient's post-core crown restoration, and simplifying the technician's production process.

This kind of full digital design method of computer synchronous design of tooth posts, cores and crowns aims at the problem that the 3D dental design software cannot recognize that the digital post and cores designed in S3 and the male mold model of the remaining teeth are integrated as a whole. In the die interface interface at the beginning of the design, the post-core adhesive gap is set to a negative value, so that there will be no gap between the post-core design and the remaining tooth body, and at the same time, it can smoothly penetrate into the tooth body to achieve complete positioning and contact with the remaining tooth body. At this time, the software can recognize the digital post-core and the remaining tooth as a whole, and then design the crown on this basis.

The description of the advantages and disadvantages contrast of table 1 embodiment method and existing method

As shown in Table 1 above, in this fully digital design method of synchronous computer design of tooth post core and crown, it is possible to design the full crown immediately after the computer design completes the digital post core, so that it does not need to be like the traditional method: After the post preparation, scan and design the digital post and core. After the cutting is completed, put the post and core in the patient's mouth, then prepare the tooth, and then re-scan the tooth, design and make a full crown restoration, and then wear it in the patient's mouth. Into the full crown, thus saving the number of follow-up visits for patients.

The above embodiments are only to illustrate the technical ideas of the present invention, and can not limit the protection scope of the present invention with this. All technical ideas proposed according to the present invention, any changes made on the technical solution, all fall within the protection scope of the present invention Inside.

Claims (7)

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 channel and the preparation of a full crown abutment for an affected tooth, and synchronously completing the mould taking of the affected tooth pile channel and the full crown abutment by using a silicon rubber impression material to obtain a silicon rubber impression comprising the affected tooth pile channel 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 part of the impression by using three-dimensional dental design software, and obtaining a digital negative model of a diseased tooth post channel and a 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 shape 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 shape 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 a digital pile core according to the STL file;

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

s5, returning to the step S3, enabling the three-dimensional dental design software to enter a generation interface at the beginning of the post core design, changing the adhesive gap between the post core and the digital model of the residual tooth body into a negative value, commanding the three-dimensional dental design software to automatically design and output a new designed post core on the residual tooth body, and enabling the new post core to penetrate into the digital model of the residual tooth body;

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

s7, carrying out combined modeling on the new post core and the residual tooth body obtained in the step S5 by using three-dimensional dental design software, lubricating edge lines at the model connection part of the digital post core and the residual tooth body, removing undercut at the connection part of the prosthesis and the tooth body, and enabling the connection interface to be smooth, so as to provide a basis for designing a full-crown prosthesis on the connection part, and entering the next step;

and S8, selecting crown margin lines for the tooth model combined and modeled in the step S7 by using three-dimensional dental design software, and designing a full crown by considering the occlusion of the abutment surface and the opposite jaw teeth according to the shapes of the adjacent teeth and the opposite side teeth so as to realize the full-digital synchronous design of the tooth post core and the 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 impression taking of the silicon rubber impression material obtains impressions of post-preparation post canal and full crown base tooth shapes of the affected tooth, and obtains impression taking of the whole dentition including impressions of adjacent teeth, contralateral teeth and contra-jaw 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 the step S5, changing the clearance of the pile core binder into a negative value: -0.005mm to-0.10 mm or-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 binder gap between the post-core and the digital model of the remaining tooth body is changed to a negative value, specifically, the binder gap between the post-core and the digital model of the remaining tooth body except for the portion in contact with the dental crown is changed to a negative value, that is, the binder gap between the post-core and the tooth root side portion and the tooth root tip portion in the digital model of the remaining tooth body is changed to a negative value, and the binder 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 pile core does not completely conform to the root profile of the pile 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 comparison is performed to verify 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, so that the crown forms of the new pile core and the crown form of the pile core in step S3 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 the method also comprises a step S9 of outputting the STL file for cutting and manufacturing after the full crown design is finished.

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