Anterior tooth layered resin filling repair method based on digital guide plate guiding

Abstract

The invention belongs to the field of dental restoration digitalization, and particularly relates to an anterior tooth layered resin filling restoration method based on the guidance of a digital guide plate. Comprising the following steps: S1, obtaining a three-dimensional digital model of an abutment tooth preparation body; s2, generating a digital model of the dentin form of the defect part layer by layer by using oral cavity computer-aided design software; s3, completing the design of the enamel layer form on the digital model of the dentin form of the last layer of tooth defect part; s4, cover shell type guide plates covering adjacent teeth of the defective teeth are designed, and the cover shell type guide plates are numbered; s5, performing 3D printing on each layer of model and the guide plate, and checking the in-place condition of the guide plate; and S6, filling corresponding dentin resin and enamel resin in each stage of guide plate, resetting the guide plate filled with the resin to the oral dentition, and completing layered resin filling through illumination curing. According to the method, the process is optimized, the operation is simplified, and the operation precision is ensured by fully utilizing the advantages of the digital technology.

Description

Technical Field

[0001] The present invention belongs to the field of digital oral restoration, and particularly relates to a method for anterior tooth layered resin filling restoration guided by a digital guide plate. Background Art

[0002] It is relatively common for anterior teeth in the oral cavity to have partial tooth defects due to trauma, caries, or developmental deformities. Currently, the commonly used methods in clinical practice include resin filling, veneers, or full crown restorations. Resin filling is generally the first choice for clinicians, and among them, layered resin filling can achieve precise restoration of teeth. For layered resin filling, it is necessary to first take an impression of the affected tooth and pour a plaster model. On the plaster model, after restoring the shape of the affected tooth with wax, a silicone rubber lingual backplate is made. Subsequently, the doctor uses this silicone rubber backplate to stack resin layer by layer in the patient's mouth and finally complete the filling. Traditional layered resin filling techniques have disadvantages such as cumbersome operation processes, long time consumption, low strength of resin stacking and shaping, and high technical sensitivity, which limit their wide application in clinical practice.

[0003] With the application of computer technology in clinical practice, currently, after the shape of the defective tooth is designed by computer-aided design, a silicone rubber guide plate is made after 3D printing the model or a transparent film made of TUP material is pressed to make a guide plate. The guide plates made by this type of technology have problems such as poor accuracy and easy deformation.

[0004] In the Chinese patent website, a patent named "A resin restoration guide plate for anterior tooth defects and a method for making the guide plate" (CN202310533451.0) was retrieved. It describes that after obtaining the anterior tooth defect data through intraoral scanning, designing the shape and then printing the model, and using a laminating machine to press a transparent film guide plate made of TUP material. This patent avoids the problems of guide plate pressing accuracy, resin filling method, and restoration of the proximal contact relationship. Its directly pressed guide plate for restoring the shape of the affected tooth is used for manual layered resin filling after being seated in the mouth, ignoring the problem of layered resin filling space control, and does not solve the whole-process digital restoration and precise control of resin filling. Another patent named "A digital preparation method for an anterior tooth diagnostic veneer flipping guide plate" (CN202210413810.4) was also retrieved. It describes a method for making a guide plate using a transparent material, but this guide plate is used for flipping the anterior tooth diagnostic veneer. After flowing resin is injected into the guide plate at one time and then placed in the mouth, rather than using resin filling after being seated in the mouth, its structure is different from that of the anterior tooth resin filling body guide plate, so it cannot be used for layered resin filling restoration. In summary, there is an urgent need to design a method for anterior tooth layered resin filling restoration guided by a digital guide plate. Summary of the Invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention proposes a method for anterior tooth layered resin filling restoration guided by a digital guide plate, and specifically discloses the following technical solutions:

[0006] A method for layered resin filling restoration of anterior teeth guided by a digital guide plate, comprising the following steps:

[0007] S1. Scan the prepared abutment tooth with the marginal line trimmed by an oral scanner to obtain a three-dimensional digital model of the prepared abutment tooth;

[0008] S2. Import the three-dimensional digital model of the prepared abutment tooth into oral computer-aided design software, use the oral computer-aided design software to design the dentin morphology of the defective part, keep the dentin morphology of the defective part consistent with the abutment tooth, and then generate a digital model of the dentin morphology of the defective part layer by layer;

[0009] S3. Complete the design of the enamel layer morphology on the digital model of the dentin morphology of the last completed layer of tooth defect part;

[0010] S4. Import the digital model of the restored dentin morphology and the digital model of the restored enamel layer morphology into the oral computer-aided design software again, design a shell-type guide plate covering the adjacent tooth of the defective tooth, and number each shell-type guide plate;

[0011] S5. Complete the printing of each layer of model and guide plate on a digital 3D printing device, and check the seating condition of the guide plate on the printed resin model;

[0012] S6. Fill the corresponding dentin resin and enamel resin in the numbered guide plates at all levels, reset the guide plate filled with resin to the oral dentition, and complete the layered resin filling by light curing.

[0013] Further, in step S1, before the oral scanner obtains the three-dimensional digital model of the prepared abutment tooth, the edge of the tooth defect part is ground into an inclined plane, and the width of the inclined plane is 2 mm ± 0.5 mm.

[0014] Further, in step S3, the thickness of the enamel layer is designed to be 2 mm.

[0015] Further, in step S4, the shell-type guide plate is provided with a seating observation window, and the designed thickness of the shell-type guide plate is less than 2 mm.

[0016] Further, in step S5, the printing of each layer of model and guide plate adopts a light-curing additive manufacturing method or a subtractive cutting method.

[0017] Further, in step S5, the guide plate is made of a resin material with a light transmittance ≥ 85%.

[0018] Further, in step S2, the number of layers of the digital model of the dentin morphology of the defective part is determined according to the natural color of the tooth and the characteristics of the selected layered resin brand.

[0019] Further, in step S6, a transparent thin film is used to isolate the guide plate from the resin. The resin is filled in portions and then shaped by a pressing tool. Subsequently, the guide plate is removed and the excess resin that has overflowed is removed until the filling is completely compacted.

[0020] Further, in step S6, after the current layer of resin is cured by light under the guidance of the guide plate, the next guide plate is placed in the order of the numbers, and it is confirmed that it is in place completely before the operation.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. The present invention realizes the anterior tooth layered resin filling and restoration through the whole-process digital technology. The guide plate is printed layer by layer by 3D printing to accurately control the filling range and shape. During the filling process of each layer of resin, pressure filling and shaping are implemented, changing the traditional plastic forming, and effectively improving the bonding strength between the resin and the tooth body and the restoration efficiency.

[0023] 2. Compared with the currently applied semi-process digital technology, the present invention optimizes the process, simplifies the operation, and fully utilizes the advantages of the digital technology to ensure the operation accuracy.

[0024] 3. The guide plate in the present invention can be designed by a doctor with rich experience in layered resin filling, and then the restoration can be completed by a doctor without clinical resin filling, achieving the filling effect of the design doctor and reducing the technical sensitivity of the layered resin filling and restoration. Description of the Drawings

[0025] Figure 1 It is a flowchart of the implementation steps of the anterior tooth layered resin filling and restoration method based on the digital guide plate of the present invention. Detailed Embodiment

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Refer to Figure 1 , an anterior tooth layered resin filling and restoration method based on digital guide plate guidance, comprising the following steps:

[0028] S1. Scan the prepared abutment tooth with the marginal line trimmed by an oral scanner to obtain a three-dimensional digital model of the prepared abutment tooth;

[0029] S2. Import the three-dimensional digital model of the abutment preparation into oral computer-aided design software, use the oral computer-aided design software to design the dentin morphology of the defective part, keep the dentin morphology of the defective part consistent with the abutment, and then generate the digital model of the dentin morphology of the defective part layer by layer;

[0030] S3. Complete the design of the enamel layer morphology on the digital model of the dentin morphology of the last completed tooth defect part;

[0031] S4. Import the digital model of the restored dentin morphology and the digital model of the restored enamel layer morphology into the oral computer-aided design software again, design the shell-type guide plate covering the adjacent teeth of the defective tooth, and number each shell-type guide plate for easy operation in sequence during clinical practice;

[0032] S5. Complete the printing of each layer of model and guide plate on a digital 3D printing device, and check the seating condition of the guide plate on the printed resin model;

[0033] S6. Fill the corresponding dentin resin and enamel resin in the numbered guide plates at all levels, reset the guide plates filled with resin to the oral dentition, and complete the layered resin filling through light curing.

[0034] In this embodiment, in step S1, before the oral scanner obtains the three-dimensional digital model of the abutment preparation, the edge of the tooth defect part is ground into an inclined plane with an inclined plane width of 2 mm ± 0.5 mm to enhance the resin bonding strength.

[0035] In this embodiment, in step S3, the thickness of the enamel layer is designed to be 2 mm.

[0036] In this embodiment, in step S4, the shell-type guide plate is provided with a seating observation window. To ensure that the resin can receive sufficient intensity of light, the designed thickness of the shell-type guide plate is less than 2 mm.

[0037] In this embodiment, in step S5, the printing of each layer of model and guide plate adopts the light-curing additive manufacturing method (such as DLP / SLA) or the subtractive cutting method (such as CNC machining).

[0038] In this embodiment, in step S5, the guide plate is made of a resin material with a light transmittance ≥ 85% to ensure the light-curing effect.

[0039] In this embodiment, in step S2, the number of layers of the digital model of the dentin morphology of the defective part is determined according to the natural color of the tooth and the characteristics of the selected layered resin brand.

[0040] In this embodiment, in step S6, a transparent thin film is used to isolate the guide plate from the resin. The resin is filled in portions and then shaped by a pressing tool. Subsequently, the guide plate is removed and the overflowing excess resin is removed until the filling is completely compacted.

[0041] In this embodiment, in step S6, after the current layer of resin is cured by light under the guidance of the guide plate, the next guide plate is placed in the order of the numbers, and it is confirmed that it is completely in place before the operation.

[0042] In this embodiment, the oral computer-aided design software is 3Shape Dental System.

[0043] The present invention realizes the digital technology for the whole process of anterior tooth layered resin filling and restoration. The guide plates for each layer of filling are 3D printed, and the range and shape of each layer of resin filling are accurately controlled. During the filling process of each layer of resin, pressure filling and shaping are implemented, which changes the traditional plastic forming, effectively improving the bonding strength between the resin and the tooth body and the restoration efficiency.

[0044] Compared with the currently applied semi-digital technology, the present invention optimizes the process, simplifies the operation, and fully utilizes the advantages of digital technology to ensure the accuracy of the operation.

[0045] The guide plate in the present invention can be designed by a doctor with rich experience in layered resin filling, and then the restoration can be completed by a doctor without clinical resin filling, achieving the filling effect of the design doctor and reducing the technical sensitivity of layered resin filling and restoration.

[0046] Clinical application case:

[0047] For a patient who needs anterior tooth layered resin filling and restoration, the distribution of each layer of resin in the affected tooth is analyzed according to the filling principle. When the patient first visits, the tooth body of the affected tooth is prepared according to the resin filling requirements, and the three-dimensional data in the mouth is obtained using an oral scanner. Using software such as 3Shape Dental System, the shapes of each layer are designed layer by layer from the neck to the incisal edge of the affected tooth with reference to the resin distribution, and then the corresponding resin models are generated. Then the guide plates for each layer are designed, numbered and typeset, and then printed. The guide plates for each layer are tried on in the patient's mouth to ensure that each layer of the guide plate is completely in place. Finally, isolation films are placed on the mesial and distal adjacent teeth of the affected tooth. After placing a transparent isolation film in the guide plate, the corresponding resin material is filled in, and after pressing and shaping, the guide plate is removed, the excess resin is removed and the shape is adjusted, and then light curing is carried out. When using the next guide plate according to the number, it is necessary to confirm its placement again. After the guide plate is completely in place, the above steps are implemented until the guide plate is used up, and the layered resin filling is completed.

[0048] The above is only a preferred embodiment of the present invention, and does not impose any limitation on the technical scope of the present invention. Therefore, any minor modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still belong to the scope of the technical solution of the present invention.

Claims

1. A method for restoring anterior teeth with layered resin filling based on digital guide plate, characterized in that: The following steps are involved: S1. Scanning the abutment tooth preparation after edge trimming with an oral scanner to obtain a three-dimensional digital model of the abutment tooth preparation; S2. Importing the three-dimensional digital model of the abutment preparation into the oral computer-aided design software, designing the dentin morphology of the defective part using the oral computer-aided design software, keeping the dentin morphology of the defective part consistent with that of the abutment, and then generating a digital model of the dentin morphology of the defective part layer by layer; S3, completing the design of the enamel layer morphology on the digital model of the dentin morphology of the last tooth defect; S4, importing the restored digital model of the dentin morphology and the restored digital model of the enamel layer morphology into the oral computer-aided design software again, designing a cover shell guide plate covering the adjacent teeth of the defective tooth, and numbering each cover shell guide plate; S5. Complete the printing of each layer of the model and the guide plate on the digital 3D printing device, and check the position of the guide plate on the printed resin model; S6. Fill the numbered guide plates at each level with corresponding dentin resin and enamel resin, reposition the resin-filled guide plates to the oral dentition, and complete the layered resin filling through light curing.

2. A method for restoring anterior teeth with layered resin filling based on digital guide plate as claimed in claim 1, characterized in that: In step S1, before the oral scanner obtains the three-dimensional digital model of the abutment preparation, the edge of the tooth defect is polished into a bevel with a bevel width of 2 mm ± 0.5 mm.

3. The method for restoring anterior teeth with layered resin filling based on digital guide plate as claimed in claim 1, characterized in that: In step S3, the thickness of the enamel layer is designed to be 2 mm.

4. The method for restoring anterior teeth with layered resin filling based on digital guide plate as claimed in claim 1, characterized in that: In step S4, the cover shell guide plate is provided with an in-situ observation window, and the design thickness of the cover shell guide plate is less than 2 mm.

5. The method for restoring anterior teeth with layered resin filling based on digital guide plate as claimed in claim 1, characterized in that: In step S5, the printing of each layer of the model and the guide plate adopts a light-curing additive manufacturing method or a subtractive cutting method.

6. The method for restoring anterior teeth with layered resin filling based on digital guide plate as claimed in claim 1, characterized in that: In step S5, the guide plate is made of a resin material with a light transmittance of ≥85%.

7. The method for restoring anterior teeth with layered resin filling based on digital guide plate as claimed in claim 1, characterized in that: In step S2, the number of layers of the digital model of the dentin morphology of the defective part is determined according to the color of the tooth itself and the characteristics of the selected layered resin brand.

8. The method for restoring anterior teeth with layered resin filling based on digital guide plate as claimed in claim 1, characterized in that: In step S6, a transparent film is used to separate the guide plate from the resin, and the resin is filled in batches and then shaped by a pressurizing tool. Then, the guide plate is removed and excess resin that overflows is removed until the filling body is completely compacted.

9. The method for restoring anterior teeth with layered resin filling based on digital guide plate as claimed in claim 1, characterized in that: In step S6, after the current layer of resin is cured by light under the guidance of the guide plate, the next guide plate is placed in the order of numbering, and is confirmed to be completely in place before operation.

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