Automatic filling algorithm of a tooth undercut mesh model on the basis of an included angle of normal vectors

A tooth model and automatic filling technology, which is applied in the field of tooth mesh model mesh model construction, can solve the problems of few automatic filling methods, complex control point selection rules, and time-consuming problems

Active Publication Date: 2018-12-07
HANGZHOU MEIQI TECH CO LTD
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Problems solved by technology

They select a group of control points on two adjacent teeth in the undercut area, form a control surface through the control points, and then connect the edges of the two control surfaces to form an undercut mesh. Although this method is digitally formed However, the control points must be manually selected in th

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  • Automatic filling algorithm of a tooth undercut mesh model on the basis of an included angle of normal vectors
  • Automatic filling algorithm of a tooth undercut mesh model on the basis of an included angle of normal vectors
  • Automatic filling algorithm of a tooth undercut mesh model on the basis of an included angle of normal vectors

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Embodiment Construction

[0099] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0100] Embodiments of the present invention and concrete process are as follows:

[0101] 1) Complete the naming of each tooth. The tooth name consists of 2 letters and 1 number. The first letter is U or L, which means upper teeth or lower teeth respectively, and the second letter is L or R, which means On the left or right side of the tooth, the third digit indicates which tooth is on one side of the tooth, input the model of the tooth and the local coordinate system, for this embodiment, such as figure 1 As shown, tooth UL1 represents the first tooth on the left side of the upper jaw. Identify undercuts for each interdental undercut region, such as figure 2 It is the front and back of the undercut area between the teeth UR7 and UR6 of the example, where the four points P 1 ~P 4 Indicates virtual gingival boundary points.

[0102] 2) According to the p...

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Abstract

The invention discloses an automatic filling algorithm of a tooth undercut mesh model on the basis of an included angle of normal vectors. The automatic filling algorithm includes: inputting tooth models and virtual gingival boundary points, forming a tooth model pair by the tooth models of two adjacent teeth, identifying an undercut region for each tooth model pair, further identifying initial undercut region boundary points for each tooth model pair, preprocessing the initial undercut region boundary points to obtain final undercut region boundary point cloud, and finally reconstructing thefinal undercut region boundary point cloud of each tooth model pair into an undercut model. The undercut model is determined by means of an angle between a normal vector and a direction vector to realize automatic filling of undercuts, which brings convenience for later-period die molding and mechanical analysis. Moreover, the time is saved while human errors are greatly reduced to a certain extent.

Description

technical field [0001] The invention relates to a grid model construction method of a tooth grid model, in particular to an automatic filling algorithm of a tooth undercut grid model based on the angle between normal vectors. Background technique [0002] In recent years, digital oral technology has developed rapidly, and invisible orthodontics has gradually become popular. The work completed by the digital treatment assistance system is apart from establishing a tooth model to provide data support for the design of the treatment plan. Usually, in order to obtain a tooth model, it is first necessary to scan the plaster model optically to obtain the three-dimensional data of the jaw, then use digital set processing technology to segment the teeth, number the teeth to facilitate later operations, and then perform a series of operations on the digital model. [0003] Specifically, invisible aligners are a set of housings with teeth that allow the teeth to gradually reach the c...

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Application Information

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IPC IPC(8): G06T17/00G06T17/20
CPCG06T17/00G06T17/20G06T2207/30036Y02T90/00
Inventor 王启超宋雷褚玉伟张伟伟宁楠宣梦洁
Owner HANGZHOU MEIQI TECH CO LTD
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