Automatic extracting method of neck-edge line of preparation body grid model

Abstract

The invention discloses an automatic extracting method of a neck-edge line of a preparation body grid model. The method comprises S1, calculating the average curvature of a vertex of the preparation body grid model, S2, processing an obtained curvature value through adoption of method based on K-means clustering to obtain a characteristic point set F, S3, obtaining a fold line point set F<z> through adoption of an improved fold line growth technology and then generating a characteristic line, S4, optimizing the characteristic line, and S5, taking a point on the characteristic line after optimization as a control point to obtain the neck-edge line through fitting. The method has the advantages of high extraction precision, good robustness and the high automation degree, and can be widely applied to the field of mouth rehabilitation.

Description

technical field [0001] The invention belongs to the field of oral restoration, and relates to computer application technology and biomedical engineering. Background technique [0002] With the development of optical measurement and CAD / CAM technology, from the digital measurement of the patient's dental model to the application of rapid computer-aided design and production, the efficiency and quality of oral restorations have been continuously improved, and the development of oral CAD / CAM restoration technology and corresponding systems become a research hotspot. In the process of oral CAD / CAM restoration, the extraction quality of the cervical margin line of the preparation directly affects the modeling accuracy and product quality of the restoration, and when the denture is in place in the oral cavity, the position and shape of its edge seriously affect the patient's wearing and restoration. body comfort and periodontal health. Therefore, the accurate and flexible extrac...

AI Technical Summary

Problems solved by technology

This method realizes the automatic extraction of cervical margin line, but the extraction accuracy needs to be improved

Moreover, the guiding line of the local structure will be guided by the nearby non-cervical line but conforming to the characteristics, which will cause the extraction of the cervical line of individual teeth to be unable to be completed correctly, which is not reliable enough; Key Technology Research and Implementation" paper uses the "direction tracking" method to generate the initial contour line, and then uses the Snake energy model to evolve the contour line into a feature line. Zhang Changdong et al. A tooth biometric feature line extraction technology based on a heuristic search strategy is proposed, which also realizes the extraction of the cervical margin line, but in the extraction process, it is necessary to manually judge the position of the cervical margin line and pick one or more feature points interactively , this extraction method has certain requirements for the operator, and the extraction efficiency is relatively low

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