A Method for Extracting Characteristic Lines of Tooth Preparation Restoration Model

Abstract

The invention discloses a method for extracting a characteristic line of a repair model of a tooth preparation body. The method comprises the following steps that key characteristic points in a characteristic area of the preparation body are picked up, then according to a comprehensive constrained control function, a heuristic search algorithm is adopted to obtain all optimal candidate nodes between the key characteristic points through searches, and finally, all the optimal candidate nodes are connected in sequence to form an initial characteristic path between the key characteristic points,wherein the distance, the direction and characteristics are regarded as comprehensive constraint conditions of the comprehensive constrained control function; the initial characteristic path between the key characteristic points is edited; by adopting a modified characteristic path smoothing algorithm, form optimization is conducted on the edited initial characteristic path to obtain the characteristic line of the repair model of the tooth preparation body, wherein form optimization of the initial characteristic path is completed in a three-dimensional space by the modified characteristic pathsmoothing algorithm directly according to the spatial topology form of preparation body grids. The method has the advantages that the method is accurate and stable, the efficiency is high, and the extraction quality is guaranteed, so that the method can be widely applied to the field of false tooth repair.

Description

technical field [0001] The invention relates to the field of denture restoration, in particular to a method for extracting characteristic lines of a restoration model of a tooth preparation. Background technique [0002] Glossary: [0003] Triangular mesh: A type of polygonal mesh, which is a data structure used in computer graphics to model various irregular objects. Intuitively, the surface of objects in the real world is composed of curved surfaces; while in the computer world, only discrete structures can be used to simulate continuous things in reality. So the surface in the real world is actually composed of countless small polygonal patches in the computer. [0004] Tooth preparation: In the process of digital production of crowns and inlays, the dentist needs to pre-prepare the affected tooth (referred to as preparation), and the tooth preparation process is performed by the dentist on the affected tooth using a high-speed electric drill based on medical knowledge ...

AI Technical Summary

Problems solved by technology

[0016] (1) The feature line automatic extraction method cannot accurately extract the feature line of the tooth preparation in the local feature interference area, and is easily affected by the quality of the mesh model and is not stable enough

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