Method for automatically repairing adjacent surface of three-dimensional dental crown grid model based on adjacent information

Abstract

The invention discloses a three-dimensional dental crown grid model adjacent surface automatic repairing method based on adjacent information. The method comprises the following steps: 1, inputting a dental crown mesh model without an adjacent surface, and extracting left and right original shared adjacent boundaries of the dental crown mesh model from a complete dental model; 2, operation is executed on the original shared adjacent boundaries in sequence; 3, calculating the centroid of an adjacent boundary point set V of the current dental crown grid model, and projecting the centroid to a plane P obtained by fitting as an adjacent region center point o; 4, based on the adjacent boundary point set V and the central point o of the current dental crown grid model, generating triangular patches by using different strategies according to the sizes of adjacent areas; 5, reconstructing and generating a regional topological structure by using an isotropic heavy grid method; and 6, optimizing the form of the dental crown grid model by combining the curvature information of the vertexes in the generation region and the adjacency information, and obtaining a final dental crown grid model. According to the method, the trueness of the repaired dental crown grid model can be effectively improved, and the tooth state and the tooth slit condition of the patient can be accurately reflected.

Description

technical field [0001] The invention relates to the field of computer-aided design, in particular to a method for automatically repairing the adjacent surface of a three-dimensional tooth crown mesh model based on adjacent information. Background technique [0002] In recent years, with the rapid development of computer technology, the combination of computer-aided design (CAD) technology and stomatology has become an important method for orthodontic research. Through the visual display of the patient's oral cavity by CAD software, the doctor can intuitively understand the patient's oral information, and design a targeted orthodontic plan for the patient through direct interaction. At the same time, it allows patients to preview the virtual treatment effect before treatment, which is more conducive to the communication between patients and doctors on the target effect. However, the crown mesh model extracted based on the original oral scan and jaw model has the problem of m...

AI Technical Summary

Problems solved by technology

However, the crown mesh model extracted based on the original oral scan and jaw model has the problem of missing adjacent areas, which will affect the front-end display effect of CAD software

[0003]The currently commonly used 3D crown mesh model proximal surface repair method needs to manually select the contour of each tooth repair area, and then generate mesh information, which is labor-intensive and labor-intensive. Repair efficiency is low

And when the accuracy of the segmentation effect is insufficient, it is necessary to optimize and delete some areas, which will lead to the problem that the gap between the teeth of the repaired crown mesh model is larger than the gap between the teeth of the actual patient when displayed on the front end

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