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

A technology of grid model and extraction method, applied in the field of dental prosthesis, which can solve the problems of low degree of intelligence and lack of noise elimination methods.

Active Publication Date: 2015-04-08
FOSHAN NUOWEI TECH
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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.

Method used

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

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Embodiment Construction

[0076] refer to figure 1 , a cervical margin line extraction method based on a mesh model of a simple denture crown restoration, including:

[0077] S1. Scan the tooth model, and generate the corresponding triangular mesh model and point cloud model;

[0078] S2. Analyzing the overall tooth model based on the coefficient of curvature change rate analysis method, and calculating the curvature and the curvature change rate coefficient of the curvature calculation point through the method of fitting the surface with a local quadratic function;

[0079] S3, performing feature point screening on the singular triangles and regular triangles of the triangular mesh model, and then generating feature lines according to the screened feature points;

[0080] S4. Obtain the central axis of the tooth, and automatically set the initial point of the cervical margin line through the central axis of the tooth, and then use the average direction automatic iteration method to filter out the tar...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T17/30G06T7/13
CPCG06T17/30G06T2200/04G06T2207/30036
Inventor 王煜张继伟夏鸿建马杰
Owner FOSHAN NUOWEI TECH
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