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A radius determination method based on the density of orthodontic archwire bending points for space equal-radius sphere division

A technology for orthodontic archwires and determination methods, applied in archwires, orthodontics, medical science, etc., can solve the problem of digital bending of difficult orthodontic archwires, personalized orthodontic archwires that cannot be applied to clinical treatment, and bending The sequence cannot achieve the desired effect, etc.

Active Publication Date: 2021-05-18
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of bending the personalized orthodontic archwire by the robot, there may be interference between the personalized orthodontic archwire and the robot's bending claw. Afterwards, it will greatly affect the bending accuracy of the personalized orthodontic arch wire, and then affect the correction effect, so that the bent personalized orthodontic arch wire cannot be applied to clinical treatment; In the process of wire bending, the forward bending means that the unbent orthodontic arch wire is bent into a complex shaped arch wire. The interference is often caused by the unreasonable bending sequence of the forming control points, while the reasonable forward bending The bending sequence of forming control points can effectively avoid the occurrence of interference, and obtaining a reasonable bending sequence of forming control points in forward bending is a necessary prerequisite for realizing digital bending of orthodontic archwires. However, the current orthodontic archwire bending technology The field lacks a method for planning the bending sequence of the control points of the forward bending, and it is difficult to realize the digital bending of orthodontic archwires
[0004] For the research on the division field of orthodontic arch wire bending planning, it is proposed in the invention patent "A Method for Dividing Circles for Orthodontic Arch Wire Bending Planning" with the authorized announcement number CN107647925B that the inventor has authorized A method of equal-radius circle domain division, which divides the area on the orthodontic archwire curve, and finally sorts each area, so as to obtain the bending order of the final bending point, although this method has no effect on the orthodontic archwire curve. The system planning has a certain application value, but there are some limitations: firstly, this method needs to convert the spatial orthodontic archwire curve into a plane curve to divide the circular domain of the bending system, and it is inevitable that the space curve will be transformed into a plane curve. There are projection deviations, dislocations, or mutual superposition of individual bending points, so that the distribution of bending points in the circle after the division of the circle cannot be accurately determined. Therefore, the actual bending sequence after the bending plan cannot achieve the desired effect. Secondly, the The method only divides the orthodontic archwire curve with an unfounded uniform standard, and there are usually too many bending points in the divided circle interval, that is, the divided interval does not fully consider the orthodontic curve. The individual characteristics of the distribution information of bending points on the arch wire curve, for example, when there are special functional curves in the spatial distribution on the orthodontic arch wire, when dividing the circular domain of such personalized orthodontic arch wire, the existing common The planar bending planning method cannot give full play to its effectiveness, and the bending sequence planning method of the orthodontic arch wire forming control points is poor in rationality. Unreasonable planning of the bending sequence leads to invalid motion of the bending robot and mutual interference during the bending process, which is not conducive to maximizing the advantages of the bending robot and cannot significantly improve the bending efficiency

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  • A radius determination method based on the density of orthodontic archwire bending points for space equal-radius sphere division
  • A radius determination method based on the density of orthodontic archwire bending points for space equal-radius sphere division
  • A radius determination method based on the density of orthodontic archwire bending points for space equal-radius sphere division

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Embodiment 1

[0037] Embodiment 1: as figure 1 , figure 2 , image 3 , Figure 4 As shown, this specific embodiment adopts the following technical solutions: a method for determining the radius of a space equal-radius sphere division based on the density of orthodontic archwire bending points, and the specific implementation process of the method is:

[0038] Step 1. Determine the sphere division data import with equal radius:

[0039] According to the spatial orthodontic archwire curve with i bending points of the patient, calculate and input the spatial orthodontic archwire curve bending point information set T={t 1 , t 2 , t 3 ,...,t i},t i =(x i ,y i ,z i)' is the coordinates of the bending point of each spatial orthodontic archwire curve, at each bending point t i The upper robot performs different bending movements, and each spatial orthodontic archwire curve bending point t i Each corresponds to a bending point robot bending information unit r i , the robot bending info...

Embodiment 2

[0056] Embodiment 2: as figure 2 As shown, there is a personalized orthodontic archwire curve containing i=19 bending points and a special function curve, and the space equiradius sphere based on the bending point density is performed on this personalized orthodontic archwire curve In the process of determining the domain division radius, such as image 3 As shown, assuming that after the calculation of step 2, it can be known that the first attempt to divide 5 spaces with equal radius to determine the sphere, continue to step 3, define the center and radius of the 5 space equal radius spheres that were first tried to divide, and in the orthodontic Generate 5 spheres with the same radius on the archwire curve to divide the bending points, and proceed to step 4 to verify the results. When n=5, the spheres with equal radii do not meet the requirements of the set sphere limit parameters, and continue to increase The number n of trial divisions of equal-radius spheres, such as ...

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Abstract

The invention discloses a method for determining the radius of space equal-radius spherical domain division based on the density of orthodontic archwire bending points, and relates to the technical field of orthodontic archwire bending. Based on the orthodontic archwire curve bending point information set and the robot bending information set of the bending point, combined with the motion characteristics of the robot bending orthodontic archwire, a space equal radius based on the orthodontic archwire bending point density is established The method for determining the radius of the sphere division. The technical points are: equal radius to determine the spherical domain division data import; calculate the equal radius to determine the initial number of trial divisions of the spherical domain; try to divide the equal radius to determine the spherical domain; find the best number of trial divisions; output a reasonable density equal radius spherical domain division radius r equal . The present invention adopts density determination to adjust the number of trial divisions, and directly determines the division radius of a reasonable equal-radius sphere for the spatial orthodontic archwire curve, thereby improving the efficiency of equal-radius sphere division, and further improving the efficiency of orthodontic archwire bending planning , to avoid the problem of interference in the process of bending orthodontic archwires by robots.

Description

technical field [0001] The patent of the present invention relates to a method for determining the radius of space equal-radius sphere division based on the density of orthodontic archwire bending points, and belongs to the technical field of orthodontic archwire bending. Background technique [0002] Malocclusion is the third largest oral disease that endangers human health, showing a high incidence rate. In modern stomatology, fixed orthodontics is a commonly used and effective orthodontic treatment, and the bending of orthodontic archwires is a fixed In recent years, the key to orthodontic technology has been deeply influenced by digital manufacturing technology. The traditional oral manufacturing process is undergoing revolutionary changes. The field of orthodontics is also benefiting from digital technology. The processing of arch wires in orthodontic appliances is becoming digital. develop. [0003] In the process of bending the personalized orthodontic archwire by th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61C7/02A61C7/20
CPCA61C7/002A61C7/026A61C7/20
Inventor 姜金刚吴殿昊王磊郭亚峰张永德姚亮
Owner HARBIN UNIV OF SCI & TECH