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Tooth resistance center positioning method

A positioning method and tooth technology, applied in the field of oral cavity, to achieve the effect of good repeatability, high accuracy and high automation

Active Publication Date: 2021-12-31
HANGZHOU MEIQI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, root bone information from CBCT data has not yet been used to help calculate a more accurate center of resistance position

Method used

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Experimental program
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Effect test

Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] Step 1) Carry out modeling of the tooth root and alveolar bone according to the patient's oral CBCT data, and obtain an independent three-dimensional model of each tooth and a three-dimensional model of the alveolar bone.

[0038] The present invention is all based on the same three-dimensional space coordinate system.

[0039] Step 2) Determine the tooth long axis of each tooth.

[0040] This step needs to define the long axis of the tooth body of each tooth, the long axis of the tooth body is a directed straight line passing through the center of the crown and the center of the root of the tooth, and the direction of the long axis of the tooth body is the direction from the crown to the root of the tooth.

[0041] Such as figure 1 Shown, the method for determining the long axis of the tooth body in the present invention is:

[0042] 2.1) According...

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Abstract

The invention discloses a tooth resistance center positioning method. The method comprises the following steps: 1) modeling teeth and alveolar bones according to oral cavity CBCT data of a patient; 2) determining a tooth body long axis of each tooth, wherein the tooth body long axis is a directed straight line passing through the tooth crown center and the tooth root center of the tooth; 3) calculating the real tooth root length of each tooth, wherein the real tooth root length is the length of the intersection part of the tooth root model and the alveolar bone model in the long-axis projection direction of the tooth body; and 4) calculating the resistance center of the teeth. According to the method, the tooth root length and the alveolar bone height of the patient are combined, the accurate and effective tooth root length is obtained, then the accurate three-dimensional position of the resistance center is determined, and more personalized resistance center positioning is determined according to the root and bone conditions of the patient. The algorithm is high in automation, high in accuracy and good in repeatability.

Description

technical field [0001] The invention belongs to the field of oral cavity, and in particular relates to a positioning method of a tooth resistance center. [0002] technical background [0003] Center of Resistance (Center of Resistance) is an important concept in the mechanics of tooth movement, which refers to the simplified center of resistance of tooth movement constrained by surrounding tissues during tooth movement. In free space, the center of drag of an object is its center of mass. In a gravitational field, the center of drag of an object is the center. The resistance center of the tooth is inherent in the tooth and surrounding supporting tissues and is not affected by external forces. [0004] When the force line of the tooth subjected to external force passes through the resistance center, the tooth will move as a whole; when the force line of the tooth subject to the external force does not pass through the resistance center, the tooth will move obliquely, so in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61C19/04
CPCA61C19/04A61C19/041Y02T90/00
Inventor 宁楠
Owner HANGZHOU MEIQI TECH CO LTD
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