A method and system for automatically generating an orthodontic aligner model

Abstract

Embodiments of the present application disclose a method and system for automatically generating an orthodontic aligner model. The method comprises: acquiring a digitized initial tooth arrangement model; removing a undercut area included in the initial tooth arrangement model to determine an intermediate tooth arrangement model; performing nearest point projection on the initial tooth arrangement model based on the intermediate tooth arrangement model to determine a target tooth arrangement model; and generating the orthodontic aligner model based on the target tooth arrangement model.

Claims

1. A method of automatically generating an orthodontic aligner model, the method comprising: The method includes: Obtain a digital initial tooth arrangement model; The undercut regions included in the initial tooth arrangement model are removed to determine the intermediate tooth arrangement model, including: Based on a preset direction, a layer cutting operation is performed on the initial tooth arrangement model to determine multiple first layer cutting planes; For each of the plurality of first slicing planes, the following processing is performed to obtain a plurality of second slicing planes: Based on the preset direction, the bottom layer reference points of the first cutting plane are filtered out, while the surface layer reference points of the first cutting plane are retained; the bottom layer reference points are related to the inverted concave region. Based on the surface layer reference points, the vertical plane of the first cutting plane is supplemented with additional points to determine the second cutting plane; The intermediate tooth arrangement model is determined based on the plurality of second cutting planes; Based on the intermediate tooth arrangement model, the nearest point projection is performed on the initial tooth arrangement model to determine the target tooth arrangement model, including: Based on the original points of the intermediate tooth arrangement model, the nearest point is projected onto the initial tooth arrangement model to obtain the corresponding paired points, thereby determining the target tooth arrangement model; Based on the target tooth alignment model, an orthodontic braces model is generated.

2. The method of claim 1, wherein, The preset direction is the direction that makes the observed undercut area most evenly distributed on the initial tooth arrangement model.

3. The method of claim 1, wherein, The step of determining the second cutting plane by supplementing points on the vertical plane of the first cutting plane based on the surface layer reference points includes: Based on the surface layer reference point, determine the target surface layer reference point whose vertical distance meets the preset conditions; Based on the target surface layer reference point, the vertical plane of the first cutting layer plane is determined; The vertical plane is supplemented with points to determine the second cutting plane.

4. The method as described in claim 1, characterized in that, The process of determining the target tooth arrangement model by projecting the nearest point onto the initial tooth arrangement model based on the original points of the intermediate tooth arrangement model includes: Based on the projection of the original point of the intermediate tooth arrangement model onto the initial tooth arrangement model, the pairing point of the original point of the intermediate tooth arrangement model on the initial tooth arrangement model is determined; Determine whether the pairing point is a boundary point; the boundary point is a point on the edge of the initial tooth arrangement model. If yes, then obtain the original point corresponding to the paired point; if no, then obtain the paired point. Based on the acquired original point and the paired point, the target tooth arrangement model is determined.

5. The method as described in claim 4, characterized in that, The determination of the target tooth arrangement model based on the acquired original points and paired points includes: Based on the obtained original points and paired points, uniform smoothing and mesh quality optimization processes are performed to determine the target tooth arrangement model.

6. The method as described in claim 4, characterized in that, The process of determining the paired points of the original points of the intermediate tooth arrangement model on the initial tooth arrangement model by projecting the original points of the intermediate tooth arrangement model onto the initial tooth arrangement model includes: Based on the preset direction, the sidewall region of the intermediate tooth arrangement model is determined; Based on the original points of the sidewall region, the nearest point projection is performed on the initial tooth arrangement model to determine the paired points of the original points of the sidewall region on the initial tooth arrangement model.

7. A system for automatically generating orthodontic braces models, characterized in that, The system includes: The acquisition module is used to acquire the initial digitized tooth arrangement model; The removal module is used to remove the undercut areas included in the initial tooth arrangement model to determine the intermediate tooth arrangement model, including: Based on a preset direction, a layer cutting operation is performed on the initial tooth arrangement model to determine multiple first layer cutting planes; For each of the plurality of first slicing planes, the following processing is performed to obtain a plurality of second slicing planes: Based on the preset direction, the bottom layer reference points of the first cutting plane are filtered out, while the surface layer reference points of the first cutting plane are retained; the bottom layer reference points are related to the inverted concave region. Based on the surface layer reference points, the vertical plane of the first cutting plane is supplemented with additional points to determine the second cutting plane; The intermediate tooth arrangement model is determined based on the plurality of second cutting planes; The projection module is used to determine the target tooth arrangement model by performing a nearest-point projection on the initial tooth arrangement model based on the intermediate tooth arrangement model, including: Based on the original points of the intermediate tooth arrangement model, the nearest point is projected onto the initial tooth arrangement model to obtain the corresponding paired points, thereby determining the target tooth arrangement model; The generation module is used to generate an orthodontic braces model based on the target tooth alignment model.

8. An apparatus for automatically generating orthodontic braces models, the apparatus comprising a processor and a memory, the memory being used to store instructions, characterized in that, The processor is used to execute the instructions to implement the operations corresponding to the method for automatically generating orthodontic braces models as described in any one of claims 1 to 6.

9. A computer-readable storage medium storing computer instructions, characterized in that, When the computer instructions are executed by the processor, they implement the operations corresponding to the method for automatically generating orthodontic braces models as described in any one of claims 1 to 6.

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