Crown root three-dimensional model merging method

Abstract

The invention relates to a crown root three-dimensional model merging method, which comprises the following steps of preparing a denture mold or a dental jaw gypsum mold; performing optical scanning to obtain a three-dimensional digital denture mold; rebuilding a three-dimensional digital denture mold with complete tooth root information through maxillofacial region conical beam CT (Computed Tomography) scanning data extraction; on the basis of an ICP (inductively coupled plasma) algorithm, performing positioning registering on optical scanning and CBCT (cone beam computerized tomography) re-building three-dimensional denture mold according to the dental crown common region; building an occlusion plane modeling coordinate system; creating the crown gingival boundary line by a method of crown gingival boundary line extraction and quantitative bias and projection; on the basis of the crown gingival and crown root boundary line, respectively performing division cutting on the optical scanning and CBCT re-building denture mold; completing the integral fusion of three-dimensional dental crown and tooth root data based on a curvature continuous algorithm. The method provided by the invention has the advantages that the natural transition fusion of the optical scanning dental crown data and CBCT rebuilding tooth root data is realized, so that the crown root three-dimensional fusion model more similar to the real teeth can be obtained.

Description

technical field [0001] The invention relates to a crown and root three-dimensional model fusion method, in particular to a crown and root three-dimensional model fusion method based on a curvature continuation algorithm. Background technique [0002] With the development of digital technology in stomatology, digital impression technology and medical imaging technology are more and more widely used in the diagnosis and analysis of oral diseases, among which cone beam CT (Cone bean computed tomography, CBCT) technology, dental There are many reports on the application of model scanning technology and intraoral scanning technology. CT / CBCT medical image tomography technology can obtain three-dimensional volume data of the soft and hard tissues of the patient's mouth and maxillofacial region, and is the only data acquisition channel for reconstructing the three-dimensional model of the patient's tooth root and jawbone. 200 μm. Digital impression technology is mainly optical sc...

AI Technical Summary

Problems solved by technology

Previous studies on crown-root data fusion have some shortcomings such as poor segmentation of crown-gingiva and crown-root data, loss of some anatomical shape information after fusion, differences with the real anatomical shape, and unnatural transition of the model stitching.

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