A Measuring Method of Form and Position Parameters of Digital Denture

Abstract

The invention discloses a position and configuration parameter measuring method of a digital denture. The method comprises the following steps: introducing a denture model; adjusting a coordinate system of the denture model, so that a coordinate direction dir of the denture model, wherein the coordinate direction dir satisfies the following relations that an z axle is parallel to the direction ofa long axis, an x axle is parallel to a far-middle-near direction, a y axle is parallel to a buccolingual or labiolingual direction, and the directions of the x axle, the y axle and the z axle conforms to a right-hand rule; in accordance with the coordinate direction dir, recognizing five appearance high points of a denture within an h height range in a mode of calculating coordinate extreme values, wherein the h is a preset height threshold and the h is used for predicting a distance from a dental cusp to a gingival margin; and in accordance with the five appearance high points of the denture, calculating two appearance dimensions and three datum planes. According to the method provided by the invent, by adding the height threshold h, the method not only has the property of being strong in operability but also guarantees the reliability of a recognition result; the method, which calculates the two appearance dimensions and the three datum planes in accordance with the five appearancehigh points of the denture, is more convenient. The method provided by the invention can be widely applied to the denture repair field.

Description

technical field [0001] The invention relates to the field of oral restoration, in particular to a method for measuring shape and position parameters of digital dentures. Background technique [0002] In the dental restoration CAD / CAM system, the acquisition of denture shape parameters (including position parameters and shape parameters) is the basis for the restoration work such as denture crown design and tooth arrangement: the determination and adjustment of the spatial position and posture of the denture depends on the position parameters , the scaling and morphological adjustment of dentures depend on the shape parameters. [0003] The mesial-distal diameter of the crown and the buccal / labiolingual diameter are relatively common size parameters. To obtain the size parameters, it is necessary to accurately identify the high point of the shape of the denture. The shape high point refers to the most prominent part on each axial surface of the tooth body, generally includin...

AI Technical Summary

Problems solved by technology

[0007] (1) The existing identification methods of shape high points are either not operable or not reliable enough, which is not conducive to the measurement of tooth shape parameters

[0008] (2) The existing technology does not define uniform shape and position parameters for dentures, especially does not establish a reasonable reference plane for dentures, which is not conducive to the design work such as scaling, positioning and matching of dentures in the dental restoration CAD / CAM system, which is not enough convenient

Images