A method for dividing the circular domain of orthodontic archwires with variable radius based on the density of bending points

Abstract

The invention discloses a method for dividing orthodontic archwires with variable radius circles based on the density of bending points, which relates to the technical field of orthodontic archwire bending. Orthodontic archwire curve, based on the orthodontic archwire curve bending point information set, the robot bending information set of the bending point, combined with the motion characteristics of the robot bending orthodontic archwire, an orthodontic curve based on the bending point density is established. Archwire variable radius circle domain division method. The technical points are: converting the orthodontic archwire curve T into a plane curve T′; setting and simplifying the circle limit parameters; determining the radius and center of the circle; defining a reasonable density to bend the circle; judging whether to continue the circle Domain division; using the density of the bending points in the circle as the index, arrange the circles in descending order, specify the order of the bending points in the circle, and output the final bending order T of the bending points 1 and R 1 . The invention divides the area by a circle with variable radius, and takes the density of bending points in the circle as a judgment condition, which can improve the efficiency of orthodontic arch wire bending planning and avoid the problem of interference in the process of robot bending orthodontic arch wire.

Description

technical field [0001] The patent of the present invention relates to a method for dividing circles with variable radius of an orthodontic archwire based on bending point density, 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 int...

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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 method of orthodontic arch wire bending planning, it is proposed in the invention patent "A Method of Circular Domain Division for Orthodontic Arch Wire Bending Planning" authorized by the inventor with the authorization announcement number CN107647925B 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. However, because this method only divides the orthodontic archwire curve with an unfounded uniform standard, there are usually too many or too small bending points in the divided circular area. In some cases, the divided interval does not fully consider the individual characteristics of the distribution information of the bending points on the orthodontic archwire curve. For example, the bending points on the patient's personalized orthodontic archwire often have difficulty in bending each bending point. are relatively small, and the angle-to-angle ratio of each bending point is less than the specified upper limit, that is, the bending point distribution of the arch wire has special properties. When dividing, the existing orthodontic archwire forming control point bending sequence planning method is not reasonable, and it is impossible to realize efficient digital bending for this kind of personalized orthodontic archwire, so that it cannot effectively avoid the failure caused by unreasonable bending sequence planning. The bending robot produces void motions, mutual interference during the bending process, and complex bending movements, which is not conducive to maximizing the advantages of the bending robot and cannot significantly improve the bending efficiency.

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