個性化牙體預備導板離散建模技術研究
[Abstract]:With the development and application of digital technology in the field of dental prosthesis, the clinical preparation of teeth has gradually changed from the traditional manual operation to the operation with the aid of auxiliary devices. The use of digital dental preparation guide device can not only produce a higher accuracy of the preparation, but also greatly improve the efficiency of surgery, which will certainly become the mainstream treatment in the future. According to the clinical application characteristics of dental prefabricated guide plate, this paper studies the key technology of tooth preparation guide plate modeling. The main research contents and results are as follows: (1) for the gingival margin line acquisition on the tooth mesh model, An adaptive extraction algorithm based on curvature feature information is studied. The candidate regions of feature points are determined based on curvature feature information. The search radius is dynamically determined by the correlation coefficient in mathematical statistics. The principal direction of principal component is used as the guide direction, and the feature points are searched adaptively by iteration, and the curve fitting is carried out. A smooth and closed gingival margin line is obtained. (2) A sweeping modeling method based on transition section is proposed for the construction of pre-guide plate support. The transition section is inserted at each node of the sweep path curve, and the contour curve on each section is obtained by projection method, and the swept surface is formed. The closed swept body is obtained by inserting random discrete points and Delaunay triangulation. (3) the discrete parameterized modeling technique of triangular grid axial guide rail model is studied. Based on the analysis of the constraint relationship between the dental needle and the preparatory body, the dimension constraint model of the axial guide rail is determined, and the parametric modeling of the axial guide rail is realized, and the dynamic updating of the guide rail model is realized based on the historical model. On the basis of the above theoretical research results, the digital modeling software module of individualized dental preparatory guide plate is developed on the platform of VS2008 and based on OpenGL graphics library, and the validity and stability of the system are verified by an example.
【學位授予單位】:南京航空航天大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:R783;TP391.7
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