唇舌侧托槽伸出压入力学性能的有限元分析

A comparative assessment of extrusion and intrusion capabilities between lingual and labial brackets using three-dimension finite element

摘要:

摘要：目的  分析不同尺寸材质弓丝对唇舌侧托槽伸出压入性能的影响规律。方法  建立上前牙唇舌侧托槽，3种材质（不锈钢、β钛、镍钛），2种尺寸（0.43 mm×0.64 mm、0.41 mm×0.64 mm）弓丝有限元模型，模拟左上颌中切牙伸出压入位移加载1 mm。结果  随着位移的增大，唇舌侧托槽力矩值逐渐增大；相同位移下，舌侧托槽压入力矩值约为唇侧托槽的3～4倍，伸出力矩值为2～3倍；弓丝尺寸越大，力矩值也越大；弓丝尺寸对两种托槽力矩值的影响小于弓丝材质，更小于两者协同。结论  相同位移时，唇舌侧托槽伸出压入力值存在倍数关系，弓丝尺寸及材质对两种托槽力矩值均有影响，临床应根据所需力值大小，对两种托槽及匹配的弓丝组合进行选择。

关键词:

 ;唇舌侧托槽;伸出;压入;三维有限元;力学性能

Abstract:

Abstract: Objective To analyze the difference of extrusion and intrusion performance between lingual and labial brackets as well as the influence pattern of arch wires with different materials and sizes. Methods The three-dimensional (3D) finite element models of lingual and labial brackets from the right upper canine to the left upper canine were constructed, including three kinds of materials (stainless steel, beta-titanium and nickel-titanium) and two sizes (0.43 mm × 0.64 mm, 0.41 mm × 0.64 mm) of arch wires, so as to compare and analyze their mechanical properties after the extrusion and intrusion load on the left maxillary central incisor with displacement of 1 mm. Results With the increase of displacement, force moment of both lingual and labial brackets gradually increased in each operating condition. Under the same displacement, the intrusion force moment of the lingual orthodontic bracket was about 3 to 4 times of the labial bracket and the extrusion force moment was about 2 to 3 times. Force moments of lingual and labial brackets was affected by the characteristics of arch wires. The effect of arch wire dimension was less than the type of wire alloy. The synergic effect of the size and material was the biggest. Conclusions The lingual and labial brackets have multiple relationships in the same displacement, and different dimensions and materials of arch wires will have different mechanical behaviors. In clinical application, dimensions and materials of arch wires of lingual and labial brackets should be adjusted properly according to the required value of force.

Key words:

lingual and labial brackets; extrusion; intrusion; three-dimensional finite element; mechanical property