Neck-edge line extraction method based on simple crown prosthesis mesh model of false tooth

Abstract

The invention discloses a neck-edge line extraction method based on a simple crown prosthesis mesh model of a false tooth. The neck-edge line extraction method comprises the following steps: scanning a tooth model, and generating a corresponding triangular mesh model and a corresponding point cloud model; analyzing the whole tooth model by adopting an analytical method based on curvature change rate coefficients, and determining the curvature of curvature calculation points and the curvature change rate coefficients through a local quadratic function fitting surface method; carrying out feature point screening on irregular-shaped triangles and regular triangles of the triangular mesh model respectively, and then generating feature lines according to the screened feature points; obtaining a tooth axle wire, automatically setting the initial points of neck-edge lines through the tooth axle wire, and then screening out a target neck-edge line from the feature lines by adopting an automatic iteration method in a mean direction; carrying out fitting and smoothening on the target neck-edge line so as to complete the extraction of the neck-edge line. The neck-edge line extraction method has the advantages of high extraction precision, reliability, high degree of intellectualization and low noise, and can be widely applied to the field of dental prosthesis.

Description

technical field [0001] The invention relates to the field of oral restoration, in particular to a method for extracting a cervical margin line based on a mesh model of a simple denture crown restoration. Background technique [0002] The application of CAD / CAM technology in oral restoration has achieved rapid development. Compared with traditional manual restoration methods, oral CAD / CAM technology not only greatly improves the restoration efficiency, but also has better restoration quality. Dental biometric lines include the cervical margin line of the single crown preparation and the cavity margin line of the inlay preparation model. The extraction of biological characteristic lines of tooth preparations is a key link in the modeling design of digital oral restorations. The quality of the extraction of biological characteristic lines directly affects the modeling accuracy of restorations, which is related to the comfort of patients wearing restorations, and also has an imp...

AI Technical Summary

Problems solved by technology

However, this algorithm uses interactive neckline extraction, which requires the user to set the initial point, which has a low degree of intelligence and lacks an effective noise removal method.

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