A digital generation method for a bridge body of a crown bridge

Abstract

The invention discloses a digitalized generation method for pontic of a full crown bridge. According to a gingival model, a gingival end surface model obtained by utilizing implicit surface isometricoffset based on radial basis function has extremely high smoothness, and no wrinkles or local self-intersection occurs. A proper transition gap is arranged between the pontic and the gingiva, so thatit is avoided that food is stuck in teeth and it is also guaranteed that the pontic has a sufficient bearing capacity. According to the position relationship between a standard crown and a gingival end surface, the standard crown is dynamically cut to create a good boundary position relation for transition between the standard crown and the gingival end surface, and the generation quality of transition surfaces is significantly improved. Meanwhile, according to a whole set of standard crowns with regular forms, the method of transition surface generation based on skin subdivision is adopted incombination with particular forms of the standard crowns, the generation efficiency of the transition surfaces is greatly improved, the real-time effect of the pontic can be shown in the edit state,which is beneficial for editing operation in the next step. The digitalized generation method for the pontic of the full crown bridge can be widely used in the field of dental prosthesis.

Description

technical field [0001] The invention relates to the field of denture restoration, in particular to a method for digitally generating a full crown bridge body. Background technique [0002] In recent years, the application of CAD / CAM technology in the field of oral restoration has achieved rapid development. Compared with traditional manual restoration methods, oral CAD / CAM technology has significantly reduced the labor intensity of dental technicians and greatly improved restoration efficiency. , with better restoration quality, and at the same time meet the design requirements of personalized restorations. In oral clinical restoration, when one or more adjacent teeth are completely missing, it is impossible to prepare the missing teeth, and a full crown bridge is required for restoration. A full crown bridge generally consists of 3 parts: retainer, pontic and connector. The pontic, also known as the artificial tooth, is connected to the retainer at both ends or one end, a...

AI Technical Summary

Problems solved by technology

[0008] Sun Yuchun et al. "Computer Aided Design of Porcelain Fixed Denture Base Bracket Based on Reverse Engineering Technology": This design uses general reverse engineering software rather than professional oral restoration software. The operation process is relatively complicated, and the designer is required to have a certain degree of computer graphics. Knowledge, especially the editing and modification of spline curves and surfaces, limits the popularization and application of the algorithm

[0009] An Tao's "Digital Design Technology Research and Application of Oral Basal Bridge", Song Yali's "Dental CAD Key Technology Research and Development": Summary of shortcomings: (1) The generation effect of the gingiva end surface is affected by the quality of the gingiva model. If the quality of the gingiva model is poor, the generated There are folds on the gingival end surface of the bridge, and even self-intersection occurs locally; (2) the smoothness of the transition at the gingival end surface of the bridge body is poor; (3) when the shape of the generated bridge body does not meet the design requirements, it is necessary to modify the standard crown. Edit position and size

Due to the high complexity of the bridge body generation algorithm, after adjusting the standard crown, the generation effect of the bridge body cannot be displayed constantly, which affects the continuity of editing, and the execution efficiency of the algorithm is low

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