Method for automatically segmenting whole dental triangular mesh model

Abstract

The present invention discloses a method for automatically segmenting a whole dental triangular mesh model. The method comprises: obtaining mean curvature and mean squared deviation curvature of each grid vertex; obtaining boundary feature points and boundary feature regions; separating the dental triangular mesh model into a plurality of independent grid regions, and performing distinction on the grid regions; marking a gum region and a teeth region with different numbers; utilizing a region growing computing method to process the teeth to acquire precise segmentation results; sorting the teeth according to geodesic distances between other teeth and the last one respectively, and cutting the teeth according to the order; and removing burrs of the teeth, deleting eversion patches, processing the teeth by adopting a laplacian smoothing method, then, eliminating narrow triangle patches, thereby finally segmenting the dental triangular mesh model. According to the method disclosed by the present invention, curvature distribution of the triangular mesh model is used for preliminary segmentation on the dental model; the region growing method is used for precise segmentation on the teeth model; and smoothing processing is carried out on a rough boundary and an eversion boundary, so that the purpose of quickly and automatically segmenting the teeth is achieved, and the segmentation is precise and smooth.

Description

technical field [0001] The present invention relates to the grid segmentation technology in the field of digital geometry processing, in particular to a method for automatically segmenting the triangular mesh model of full-jaw teeth, which is suitable for quickly and automatically segmenting the tooth triangular mesh surface from the dental triangular mesh surface . Background technique [0002] In recent years, digital oral technology has developed rapidly, and invisible orthodontics have gradually become popular. The job to be done by the digital treatment assistant system is to establish a tooth model and provide data support for the design of the treatment plan. To establish an accurate tooth model, it is first necessary to scan the plaster model through optical methods to obtain three-dimensional data of the teeth and jaws, and then use digital geometry processing technology to separate the data of the teeth and gums, and repair the missing parts of the teeth to establ...

AI Technical Summary

Problems solved by technology

Although Liao et al. segmented all teeth at once using a consistent harmonic field, the accuracy of the method still relies on human interaction

[0006] In short, the existing methods of segmenting the tooth triangular mesh model from the dental triangular mesh model have various defects in the application, mainly manifested in low precision, low efficiency and complicated interaction

Images