Shape modification method for porcelain-fused-to-metal false tooth

Abstract

The invention discloses a shape modification method for a porcelain-fused-to-metal false tooth. The method comprises the following steps: firstly, determining a central line; secondly, modifying by taking mutually-occlusal teeth and adjacent teeth as references according to radian of dental arch and a most raised abutment tooth to obtain the radian of the false tooth; thirdly, modifying by taking the mutually-occlusal teeth and the adjacent teeth as references to obtain the length of the false tooth, and determining the length of a rear tooth according to an occlusion height; fourthly, modifying protrusions and shapes of lingual and buccal sides of the false tooth according to occlusal surfaces of the adjacent teeth; fifthly, preliminarily carving out developmental groove shapes by a hexagonal needle, and deepening and turning out the developmental grooves by a turning needle, wherein the main development groove is deeper than the auxiliary development groove; finally, turning and modifying the edge of the false tooth by a sharp needle and keeping the surface of the false tooth wet. According to the method, the central line is determined, the overall shape, with the radian, the length and the like, of the false tooth is obtained by modification, a carved tooth surface is subjected to shape modification, and the developmental grooves are carved; the false tooth is modified from coarse to fine and from whole to part; the prepared porcelain-fused-to-metal false tooth is well matched with a genuine tooth and is comfortable to wear and good in user experience.

Description

technical field [0001] The invention relates to the technical field of oral cavity fixed prosthetics, in particular to a method for modifying metal-ceramic dentures. Background technique [0002] Oral fixed restoration is a kind of denture method applied to the restoration of missing teeth. At present, more and more metal-ceramic dentures are used clinically when repairing missing teeth. Porcelain-fused-to-metal denture is a restoration made of porcelain powder sintered at high temperature and fused to the surface of the metal inner crown. It has the advantages of good mechanical strength of cast metal and beautiful appearance of all-ceramic denture. It is an ideal restoration. [0003] However, since the porcelain powder will shrink after sintering at high temperature, it is difficult to precisely control the shape. Therefore, after the completion of porcelain fused to dentures, the shape needs to be trimmed so that its structure and color match the real teeth. However, ...

AI Technical Summary

Problems solved by technology

However, due to the high strength of the ceramic body of the metal-ceramic denture, the matching degree between the finished product and the real tooth is high, and the shape of each denture is also different. It is difficult to automatically complete the trimming of the denture shape by mechanical operation, and only rely on the experience of workers. Morphological modification is often difficult to achieve a perfect match between dentures and real teeth, and it is easy to cause problems such as protrusions and excessive gaps