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Method for measuring transverse and longitudinal inclinations of teeth

A technology of inclination angle and measurement method, used in dentistry, dental radiology diagnosis, medical science and other directions, can solve the problems of large influence on the results, increase of unstable factors, and the angles of bending steel wires are not similar, and achieve high accuracy of results. Effect

Active Publication Date: 2015-11-11
SOUTHERN MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the use of sticking brackets or placing bent steel wires in the grooves, the unstable factors in the operation process are artificially increased, such as the directions and positions of different operators sticking brackets are not uniform, and the direction and angle of bent steel wires are different. similar
The steps of the indirect measurement method are too cumbersome, and the human operation factors in the process have a great influence on the results, and the accuracy of the results cannot be guaranteed

Method used

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  • Method for measuring transverse and longitudinal inclinations of teeth
  • Method for measuring transverse and longitudinal inclinations of teeth
  • Method for measuring transverse and longitudinal inclinations of teeth

Examples

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Embodiment 1

[0041] A method for measuring the transverse and longitudinal inclination angles of teeth is carried out through the following steps:

[0042] (1) 3D simulation model reconstruction

[0043] The pyramidal beam computed tomography data of the skull of the target object are collected, and a three-dimensional simulation model of the mandible and lower dentition corresponding to the target object is established according to the obtained pyramidal beam computed tomography data.

[0044] (2) Reference point selection

[0045] Reference points include dental arch reference points and base bone arch reference points. The FA point of the dental arch reference point, also known as the face axis point, is the clinical position for placing orthodontic brackets. The FA point from the lower right first premolar to the lower left first premolar is defined as the clinical crown center point. The first and second The FA point of the molar was defined as the most convex point of the clinical ...

Embodiment 2

[0063] A method for measuring the transverse and longitudinal inclination angles of teeth according to the present invention will be described with a specific embodiment. The method of the present invention is carried out through the following steps.

[0064] A total of 104 cases of skeletal Ⅰ, Ⅱ, Ⅲ malocclusion patients and individual normal occlusions were selected from the Department of Orthodontics. All subjects collected CBCT data before treatment, and underwent three-dimensional reconstruction of the mandibular model. Use the software Mimics and GeomagicStudio to establish a coordinate system and draw up reference points on the virtual model, and obtain the coordinate values ​​of the FA and AP points of each tooth position and their projection points 2FA and 2AP on the xy plane. Import the coordinates of the reference points of the dental arch and base bone arch from the left lower canine to the right lower canine into the software Matlab, and use the calculation formula...

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Abstract

A method for measuring transverse and longitudinal inclinations of teeth includes the steps of 1, performing three-dimensional simulation model reconstruction; 2, selecting reference points, for a simulation model, drawing dental arch reference points FA and basal bone reference points AP at incisor teeth and first molars in left and right lower jaws in the simulation model, respectively; 3, establishing a coordinate system, defining a midpoint among four points FA31', AP31', FA41' and AP41' as an origin O of the coordinate system, defining a midpoint among four points FA36', AP36', FA46' and AP46' as a point Y, defining a line OY as an axis y, using a plane formed by a mesial contact point connecting to the incisor teeth in the lower jaw and mesial buccal cusps of the left and right first molars, as a plane xy, namely an occlusal plane; and 4, measuring transverse and longitudinal inclinations of teeth. The method has the advantages that observation is direct, detection is convenient and results are accurate.

Description

technical field [0001] The invention relates to the technical field of orthodontics, in particular to a measurement method for measuring the transverse and longitudinal inclination angles of teeth by establishing a new coordinate system on a three-dimensional virtual model and drawing up reference points. Background technique [0002] Tooth inclination measurement is one of the key factors to ensure orthodontics. One of the most commonly used methods for measuring the inclination of teeth is to use a metal protractor or various combinations of metal measuring instruments to measure the inclination angle of the labial and buccal surfaces of the crown on the plaster model of the tooth and jaw. The specific method is to grind and fix the base of the dental and jaw plaster model, so that the plane of the base is kept parallel to the reference plane, and mark the reference point on the lip and buccal surface of the tooth to be measured as the position and position of the metal pr...

Claims

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Application Information

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IPC IPC(8): A61C19/04A61B6/14
Inventor 黄文华林思豆
Owner SOUTHERN MEDICAL UNIVERSITY
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