Space variable-radius spherical domain division method for orthodontic arch wire bending sequence planning
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An orthodontic arch wire and variable radius technology, which is applied in the fields of arch wire, orthodontics, medical science, etc., can solve the problem of lack of space orthodontic arch wire curve bending planning and other problems
Active Publication Date: 2020-08-28
HARBIN UNIV OF SCI & TECH
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[0005] Aiming at the above problems, the present invention proposes a spatial variable-radius sphere division method for orthodontic archwire bending sequence planning, which solves the lack of direct bending of spatial orthodontic archwire curves in the current orthodontic archwire bending technology field. In order to obtain a reasonable orthodontic archwire bending sequence, a reasonable division basis is put forward in the process of bending sequence planning, and quantitative constraints are placed on the density of bending points and the complexity of bending
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Embodiment 1
[0043] Embodiment 1: as figure 1 , figure 2 , image 3 As shown, the specific implementation mode adopts the following technical solution: a space variable radius sphere division method for orthodontic archwire bending sequence planning, the specific implementation process of the method is as follows:
[0044] Step 1. Data import of variable radius sphere division:
[0045] According to the orthodontic archwire curve with i bending points of the patient, calculate and input the 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 each orthodontic archwire curve bending point, at each bending point t i The upper robot performs different bending movements, each orthodontic archwire curve bending point t i Each corresponds to a bending point robot bending information unit r i , the robot bending information set of the input bending point is R={r 1 , r 2 , r 3 ,...,r i}, r i =(x i ,y ...
Embodiment 2
[0068] Embodiment 2: as figure 2 , image 3 As shown, in the planning process of orthodontic archwire bending sequence planning for a personalized orthodontic archwire curve containing i=18 bending points to divide the plane variable radius sphere, it is assumed that the number of reasonable bending spheres finally obtained The number is n=6, and the numbers of bending points in each sphere are respectively In step 6, calculate each reasonable curved spherical domain (a 1 , a 2 ,...,a n ) spherical bending point density Obtain the spherical bending point density information set Comparing the bending point density of each reasonable bending sphere, there is Spherical Bending Point Density Arrange the n spheres in descending order as an indicator, so as to obtain the information set of descending reasonable curved spheres as A 1 ={a 5 , a 2 , a 3 , a 4 , a 1 , a 6}, stipulates that in any bending area, the order of bending points corresponding to the angle-to...
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Abstract
The invention discloses a space variable-radius spherical domain division method for orthodontic arch wire bending sequence planning, and relates to the technical field of orthodontic arch wire bending. The space variable-radius spherical domain division method for orthodontic arch wire bending sequence planning is established according to a personalized orthodontic arch wire curve of a patient, based on an orthodontic arch wire curve bending point information set and a bending point robot bending information set, and in combination with the movement characteristics of a robot bending orthodontic arch wire. The technical key points are as follows: variable-radius spherical domain division data is imported; the upper limit value of a spherical domain limiting parameter is set; the radius and the sphere center of a divided spherical domain are determined; a reasonable bending spherical domain is defined; whether spherical domain division is continued or not is judged; and with the density of spherical domain bending points as an index, all spherical domains are arranged in a descending order, the bending point sequence of the spherical domains is specified, and the final bending point bending sequences T1 and R1 are output. According to the method, the space arch wire curve is divided into regions by the variable-radius spherical domains, so that the accuracy of orthodontic archwire bending planning can be improved, and the problem of interference in the process of bending the orthodontic arch wire by the robot is avoided.
Description
technical field [0001] The patent of the present invention relates to a space-variable-radius sphere division method for orthodontic archwire bending sequence planning, 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 the robot, there may be interference b...
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