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CN-122005117-A - Orthodontic tooth movement data measuring method, equipment and storage medium

CN122005117ACN 122005117 ACN122005117 ACN 122005117ACN-122005117-A

Abstract

The application provides a measuring method, equipment and a storage medium of orthodontic tooth movement data, which comprise the steps of constructing a unified measurement coordinate system, adjusting a pre-treatment tooth digital model and a post-treatment tooth digital model to be under the unified measurement coordinate system, extracting characteristic points of target teeth, calculating multidimensional movement data, calculating centroid movement vectors of curved surfaces formed by characteristic point movement vectors and characteristic points based on coordinates of corresponding characteristic points on the pre-treatment model and the post-treatment model, and angle differences of centroid normal lines and angular bisectors in YZ planes and XZ planes, outputting multidimensional movement data in batches, visually displaying position changes of the characteristic points before and after treatment, breaking through the limitation that the prior art only measures the integral gravity center movement of teeth, accurately capturing the movement of local characteristics such as dental cusps, dental sockets and the like, reflecting the change of tooth inclination angles, and meeting the evaluation requirements of clinical fine adjustment.

Inventors

  • ZHANG XINZE
  • ZHANG JIACHAO
  • CHENG XIAOHUI
  • WANG XIAOYAN
  • SU YINGYING
  • WU RUIQING

Assignees

  • 首都医科大学附属北京天坛医院

Dates

Publication Date
20260512
Application Date
20260227

Claims (10)

  1. 1. A method for measuring orthodontic tooth movement data, comprising the steps of: step 10, constructing a unified measurement coordinate system, namely adjusting the pre-treatment tooth digital model and the post-treatment tooth digital model to be under the unified measurement coordinate system; Step 20, extracting characteristic points of target teeth, wherein the target teeth comprise teeth of an upper jaw No. 1, a lower jaw No. 3, a lower jaw No. 6 and teeth of a No. 6, 29 characteristic points are extracted from the upper jaw teeth, and 16 characteristic points are extracted from the lower jaw teeth; Step 30, calculating multidimensional movement data, namely calculating a characteristic point movement vector, a centroid movement vector of a curved surface formed by the characteristic points and an angle difference value of a key reference line in a YZ plane and an XZ plane based on coordinates of corresponding characteristic points on a model before and after treatment; And step 40, outputting the multi-dimensional movement data in batches, and visually displaying the position change of the characteristic points before and after treatment.
  2. 2. The method according to claim 1, wherein an origin of the unified measurement coordinate system is set to be a midpoint of a line connecting points of cusps of mandibular incisors, an X axis extends in a left-right direction of an oral cavity and points to the left as a positive direction, a Y axis extends in a front-rear direction of the oral cavity and is far from a molar area as a positive direction, and a Z axis extends in a vertical direction of teeth and points to an occlusal surface as a positive direction.
  3. 3. The method according to claim 2, wherein in the step 20, the characteristic points of the teeth of the upper jaw include characteristic points 6, 16, 28 of teeth of the upper jaw 1, characteristic points 5,15, 27 of teeth of the upper jaw 3, characteristic points 3, 4, 14, 22, 23 of teeth of the upper jaw 6, and characteristic points 1,2, 13, 21 of teeth of the upper jaw 7, and the characteristic points of the teeth of the lower jaw include characteristic points 3, 8, 15 of teeth of the lower jaw 1, and characteristic points 1,2, 7, 11, 12 of teeth of the lower jaw 6.
  4. 4. The method according to claim 1, wherein in step 30, the characteristic point movement vector is calculated by calculating a difference between the post-treatment characteristic point coordinates and the pre-treatment characteristic point coordinates according to the coordinate values of each pair of pre-treatment and post-treatment corresponding characteristic points to obtain the characteristic point movement vector = (X 2 -x 1 ,y 2 -y 1 ,z 2 -z 1 ), wherein (x 1 ,y 1 ,z 1 ) is the pre-treatment feature point coordinates, (x 2 ,y 2 ,z 2 ) is the post-treatment feature point coordinates, the modulo length of the motion vector represents the feature point movement distance, and the direction represents the feature point movement direction.
  5. 5. The method according to claim 1, wherein the curved surface comprises a triangular surface and a quadrangular curved surface, wherein the characteristic points 1, 2, 21 of the teeth of the upper jaw 7 form the triangular surface, the characteristic points 3, 4, 22, 23 of the teeth of the upper jaw 6 form the quadrangular curved surface, and the characteristic points 1, 2, 11, 12 of the teeth of the lower jaw 6 form the quadrangular curved surface.
  6. 6. The method according to claim 5, wherein the centroid movement vector is calculated by calculating centroid coordinates of the front and back curved surfaces, respectively, and calculating a difference between the centroid coordinates after treatment and the centroid coordinates before treatment.
  7. 7. The method for measuring orthodontic tooth movement data according to claim 1, wherein: in step 30, the key reference line includes a centroid normal line of the curved surface and an angular bisector of a connecting line of three feature points, and the calculation mode of the angular difference value of the centroid normal line is as follows: 1) Extracting a normal L 1 of the treatment front curved surface and a normal L 2 of the treatment back curved surface; 2) Projecting L 1 and L 2 to a YZ plane and an XZ plane respectively to obtain plane projection lines; 3) Calculating the included angle between the plane projection lines of each projection plane to obtain the angle difference value in the YZ plane Angle difference Δq Method of Xz in Δq Method of yz and XZ plane; the calculation mode of the angle difference value of the angle bisector is as follows: 1) Extracting an angular bisector L 3 formed by connecting the three characteristic points before treatment and an angular bisector L 4 formed by connecting the corresponding characteristic points after treatment; 2) Projecting L 3 and L 4 to a YZ plane and an XZ plane respectively to obtain plane projection lines; 3) Calculating the included angle between the plane projection lines of each projection plane to obtain the angle difference value in the YZ plane Angle difference Δq Flat plate yz and XZ plane Δq Flat plate Xz .
  8. 8. The method for measuring orthodontic tooth movement data according to claim 1, wherein, Before the step 10, the method further comprises: And 09, constructing a tooth digital model, namely acquiring intraoral three-dimensional data before and after orthodontic treatment by using an open source intraoral scanning device, and generating the tooth digital model before treatment and the tooth digital model after treatment without shooting CT.
  9. 9. An electronic device comprising a memory and a processor, the memory having stored thereon a computer program, characterized in that the processor, when executing the computer program, implements the method according to any of claims 1-8.
  10. 10. A computer readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the method according to any one of claims 1 to 8, the computer program supporting batch data processing.

Description

Orthodontic tooth movement data measuring method, equipment and storage medium Technical Field The application relates to the technical field of orthodontic teeth, in particular to a method, equipment and a storage medium for measuring orthodontic tooth movement data, which are particularly suitable for a scene of accurately measuring specific orthodontic tooth movement data in batches and multiple dimensions without CT assistance. Background In orthodontic treatment, accurate measurement of tooth movement data is a core basis for evaluating treatment effects and adjusting treatment schemes. The main current tooth movement data measurement method has the following defects: ① The manual measurement method relies on the experience of doctors to manually mark and measure, has obvious deviation between a predicted value and an actual tooth movement value, has extremely low efficiency, and cannot meet the requirement of batch case treatment. ② Although the traditional three-dimensional data software method can realize digital measurement, the reconstruction efficiency of irregular curved surfaces of teeth is low, a plurality of software cooperative operations are needed to be integrated for processing the three-dimensional digital model, the process is complicated, and the whole movement trend of teeth can be output, so that the movement details of tooth parts such as tooth cusps and tooth sockets can not be accurately reflected. ③ In order to ensure the measurement accuracy, the three-dimensional overlap measurement method needs to assist in shooting CT to acquire deep structure data such as alveolar bone and the like, so that the radiation exposure risk of a patient is increased, and the detection cost and the operation complexity are also improved. In the prior art, as disclosed in chinese patent document CN119454260a, a method for detecting orthodontic correction motion vector has the core thought of performing PCA coordinate system registration-RANSAC global coarse registration-ICP fine registration by using an alveolar bone U-shaped curved surface as a reference through a clipping-correcting-dividing pretreatment model, and finally calculating the motion vector by using the center of gravity offset of the tooth. Although the method improves the degree of automation of registration, the method still has the limitation: firstly, the whole gravity center of the teeth is taken as a measuring object, so that the local movement of key characteristic points such as dental cusps, dental sockets and the like cannot be accurately captured, and the evaluation requirement of clinic on fine angle adjustment of the teeth is difficult to meet; Secondly, the pretreatment is dependent on the segmentation step of the alveolar bone and the teeth, so that the segmentation precision is easily affected for the case of irregular tooth morphology, and further registration errors are caused; Thus, it is highly desirable for those skilled in the art to develop a method for measuring orthodontic tooth movement data that can accurately measure in multiple dimensions and meet the clinical demands for fine adjustment evaluation. Disclosure of Invention In order to solve the technical problems, the embodiment of the application provides an orthodontic tooth movement data measurement method capable of realizing multidimensional accurate measurement and meeting the clinical requirements on fine adjustment and evaluation. To achieve the above object, in a first aspect of the present application, there is provided a method of measuring orthodontic tooth movement data, the method comprising the steps of: Step 10, constructing a unified measurement coordinate system, and adjusting the pre-treatment tooth digital model and the post-treatment tooth digital model to be under the unified measurement coordinate system; Step 20, extracting characteristic points of target teeth, wherein the target teeth comprise teeth of an upper jaw No. 1, a lower jaw No. 3, a lower jaw No. 6 and teeth of a No. 6, 29 characteristic points are extracted from the upper jaw teeth, and 16 characteristic points are extracted from the lower jaw teeth; Step 30, calculating multidimensional movement data, namely calculating a characteristic point movement vector, a centroid movement vector of a curved surface formed by the characteristic points and an angle difference value of a key reference line in a YZ plane and an XZ plane based on coordinates of corresponding characteristic points on a model before and after treatment; And step 40, outputting the multi-dimensional movement data in batches, and visually displaying the position change of the characteristic points before and after treatment. Further, the origin of the unified measurement coordinate system is set as the midpoint of the connection line of the cusps of the incisors of the mandible, the X axis extends along the left-right direction of the oral cavity and points to the left side to be in the positive directio