Multi-reference point system aligned edentulous jaw model centric relation position three-dimensional reconstruction method

Abstract

The invention relates to a multi-reference point system aligned edentulous jaw model centric relation position three-dimensional reconstruction method. The method comprises steps of adhering three positioning columns with equal sizes on the axial surfaces of a pedestal of an upper edentulous jaw alveolar crest plaster model and a pedestal of a lower edentulous jaw alveolar crest plaster model; fixing the upper and lower jaw models to a centric relation position via an occlusion bearer, directly measuring center point coordinates of bottom surfaces of the six positioning columns via a contact type three coordinate measuring instrument and naming the center point coordinates as contact center point, scanning the upper and lower edentulous jaw digital model via a jaw model 3D scanner, introducing 3D reverse engineering software, fitting center points of the bottom surfaces of each positioning columns and naming the center point as a fitting center point, making the acquired positioning column bottom surface center points acquired via the above two methods as paired registering mark points, registering an order for the multi-referent point system via the 3D reverse engineering software, registering the upper and lower jaw digital models to the contact center point, and finishing three-dimensional reconstruction for the edentulous jaw model centric relation position. By the use of the method, three-dimensional reconstruction of the three-dimensional scanning data centric relation position of the edentulous jaw alveolar crest plaster model can be quickly achieved.

Description

technical field [0001] The invention relates to a method for three-dimensional reconstruction of the spatial relationship of a digital model of an edentulous jaw, in particular to a method for three-dimensional reconstruction of a central relationship position of an edentulous jaw model based on multi-reference point system alignment. Background technique [0002] When performing occlusal reconstruction and restoration treatment for edentulous patients such as complete dentures, it is necessary to accurately reproduce the physiological jaw position relationship, that is, the vertical distance and horizontal relationship, in vitro with the help of edentulous plaster models and occlusal trays. The main basis for designing and making personalized and suitable artificial dentition. [0003] When using computer-aided design and manufacturing technology to design and manufacture complete dentures, it is necessary to perform three-dimensional virtual reconstruction of the edentulou...

AI Technical Summary

Problems solved by technology

Different from plaster models with dentition, the alveolar ridge surface of edentulous jaws lacks geometric features with obvious curvature changes, which will inevitably affect the accuracy of the ICP registration algorithm in realizing the three-dimensional reconstruction of the jaw relationship

At the same time, when completing the reconstruction of the jaw position of the edentulous jaw model based on the ICP algorithm of the common area of ​​the lips and cheeks, it is necessary to complete the upper jaw model, upper jaw | A total of 5 scanning operations are performed on the lip and buccal surface, and the model needs to be installed on the mechanical | occlusal | rack, transfer |

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