Method for automatically extracting gingiva curves of three-dimensional digital dentition model

A dentition model and gingival technology, which is applied in the fields of digital design, computer graphics and biomedical engineering, and can solve problems such as deviation, inability to accurately reflect three-dimensional information of teeth, and a large number of interactive operations.

Inactive Publication Date: 2014-04-02
JIAXING UNIV
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Problems solved by technology

Kondo et al. (Kondo T, Ong SH, Foong KW.Tooth Segmentation of Dental Study Models Using Range Images.IEEE Transactions on Medical Imaging, 2004,23(3):350-362) proposed a gingival line extraction method based on depth images. The method first uses the detected tooth feature points in the plane depth image of the triangular mesh model to fit the dental arch line, and expands the dental arch line to calculate the panoramic depth image, then detects the position of the gum line in the plan view and the panoramic view respectively, and finally The results of the two images are combined to determine the segmentation boundary of

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  • Method for automatically extracting gingiva curves of three-dimensional digital dentition model
  • Method for automatically extracting gingiva curves of three-dimensional digital dentition model
  • Method for automatically extracting gingiva curves of three-dimensional digital dentition model

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[0017] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0018] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0019] Step 1. Model positioning: First select the buccal cusps of the left and right first premolars and the distal buccal cusps of the left and right first molars on the dentition model, use these four reference points to fit the occlusal plane, and then place the The occlusal plane is aligned to the XY plane, the YZ plane passes through the interstices of the two central incisors, and the two distal buccal cusps are positioned on the X axis, so that the triangular mesh dentition model can be positioned in a standard direction, such as figure 2 shown.

[0020] Step 2. Gingiva feature line search:

[0021] (1) Discrete curvature analysis of dentition model

[0022] Since the three-dimensional dentition model is a sliced ​​linea...

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Abstract

The invention discloses a method for automatically extracting gingiva curves on a three-dimensional digital dentition model. The method comprises the steps of model positioning, gingival feature line search, gingival feature line partitioning and inter-tooth space gingival line interference analysis. The method is high in automatic degree, enclosed gingival curves around each tooth on the dentition model can be constructed rapidly and accurately, the problems of low efficiency, poor accuracy and the like existing in the conventional manual design are solved effectively, and the efficiency and attractiveness of oral rehabilitation are improved.

Description

technical field [0001] The invention belongs to the field of digital design, and relates to technical fields such as computer graphics and biomedical engineering. Background technique [0002] How to accurately obtain the gingival curve shape of each tooth on the patient's dentition model is an important prerequisite for successful oral restoration. Traditional restoration methods need to manually carve wax or plaster models to simulate the gingival curves in harmony with adjacent teeth according to aesthetic requirements and expert experience. However, this method has problems in efficiency and accuracy, especially when the patient has multiple This problem is particularly acute in the case of teeth. [0003] With the rapid development of computers, a large number of dental prosthetic CAD / CAM systems have emerged abroad. However, due to factors such as limited measurement accuracy and mesh reconstruction, on the surface of the 3D digital dentition model obtained by optica...

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Application Information

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IPC IPC(8): G06T7/00G06T5/00G06T17/00G06T7/12
Inventor 吴婷张礼兵
Owner JIAXING UNIV
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