Dental model generation method based on oral scan data and cbct data

Abstract

The present invention discloses a dentition model generation method based on oral cavity scanning data and CBCT (Cone Beam Computed Tomography) data. The method comprises: reading a three-dimensional multi-source data model of an oral cavity; setting and registering a fixed model and a floating model, wherein the fixed model is a triangular mesh model created by means of CBCT, and the floating model is a triangular mesh model of intraoral scanning; manually picking up feature point pairs of the models on the fixed model and the floating model, correcting the feature point pairs according to point cloud curvature of the models, moving feature points to a point with the largest curvature in a surrounding neighborhood, and performing preliminary registration on the feature point pairs by using a point-to-point ICP (Iterative Closest Point) algorithm; calculating a point cloud error of the models after preliminary registration, and by combination with medical parameter requirements, setting a parameter of precise registration; performing precise registration by using an optimized point-to-surface ICP algorithm; and fusing the CBCT data and intraoral scanning data after registration, and outputting tooth root and crown models after registration and fusion. Rapid and precise registration and fusion of data of different devices or data of different postures of patients are implemented.

Description

technical field

[0001] The invention relates to the field of three-dimensional digitization, in particular to a method for generating a digital tooth or dentition model based on oral scan data and CBCT data, which is mainly used in clinical medicine such as orthodontics, oral restoration, and oral implantation. Background technique

[0002] In the field of stomatology, a single data cannot meet clinical needs. In orthodontics, prosthodontics, and implantology departments, complete tooth or dentition models are often required. Intraoral scanners can obtain accurate crown data, and medical imaging equipment can collect invisible bone and root data, but with low precision. Clinically, the precision requirements for dental crowns are relatively high.

[0003] Dental scanners can obtain accurate triangular grid data of visible crowns, medical imaging equipment can collect CBCT (Cone Beam Computed Tomography, cone beam CT) image data of invisible bones and teeth, after three-dim...

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