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An Algorithm for Constructing the Local Coordinate System of Teeth Using Standard Model Library

A technology of local coordinate system and standard model, applied in the field of orthodontics, can solve problems such as monotony and being easily affected by human error, and achieve the effect of improving accuracy, fast and efficient establishment, and reducing time complexity.

Active Publication Date: 2020-07-28
HANGZHOU MEIQI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this is a tedious and time-consuming process that is susceptible to human error

Method used

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  • An Algorithm for Constructing the Local Coordinate System of Teeth Using Standard Model Library
  • An Algorithm for Constructing the Local Coordinate System of Teeth Using Standard Model Library
  • An Algorithm for Constructing the Local Coordinate System of Teeth Using Standard Model Library

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Embodiment Construction

[0049] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0050] Embodiments of the present invention and concrete process are as follows:

[0051] 1) Input the tooth standard model and its local coordinate system, and input the tooth model to be processed;

[0052] Such as figure 2 As shown, the local coordinate system of the tooth standard model is established: the X-axis direction is from the lingual side to the buccal side, perpendicular to the tooth surface, and the Z-axis direction is from the tooth root to the crown, which is consistent with the growth direction of the tooth. The X-axis and Z After the axis is determined, the Y axis is also determined, that is, transversely through the teeth. The representation of local coordinates in relevant configuration files is as follows:

[0053] m 22.9851 5.91364 -1.47456

[0054] x 0.970064 0.139679 -0.198659

[0055] y -0.123819 0.988192 0.0902538

[0056] z ...

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Abstract

The invention discloses an algorithm for constructing a local coordinate system of teeth by utilizing a standard model library. The algorithm comprises the steps of inputting a tooth standard model and a local coordinate system thereof, and inputting a to-be-processed tooth model; then calculating a curvature of each vertex of the surfaces of the to-be-processed tooth model and the tooth standard model; screening and reserving the vertexes with relatively high vertex curvatures as feature points; and performing matching on feature point sets, obtained by screening and reserving, of the to-be-processed tooth model and the tooth standard model by using a specific four-point quick matching algorithm. According to the algorithm, a standard database is used as a reference to assist in constructing the local coordinate system of the teeth, so that later repair and tooth arrangement work can be facilitated and human errors are greatly reduced to a certain extent while the time is saved.

Description

technical field [0001] The invention relates to the technical field of orthodontics, in particular to an algorithm for constructing a local coordinate system of teeth by using a standard model library. Background technique [0002] In recent years, digital oral technology has developed rapidly, and invisible orthodontics have gradually become popular. The job to be done by the digital treatment assistant system is to establish a tooth model and provide data support for the design of the treatment plan. To establish an accurate tooth model, it is first necessary to scan the plaster model by optical methods to obtain three-dimensional data of the teeth and jaws, and then use digital geometric processing technology to separate the data of the teeth and gums, and repair the missing parts of the teeth to establish a movable tooth model. On, the doctor designs the orthodontic path of the teeth. [0003] Planning a course of treatment for teeth often involves various orthodontic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/00
CPCG06T17/00
Inventor 汤德衍姜嘉琦宣梦洁宋雷
Owner HANGZHOU MEIQI TECH CO LTD
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