唇舌侧弓丝力学性能差异的三维有限元分析  

A comparative assessment of mechanical property between lingual and labial archwires using three-dimension finite element method

作　　者：何淞 陈周艳[1] 杨四维[1] 黄跃[1] 

机构地区：[1]泸州医学院附属口腔医院正畸科,四川泸州646000

出　　处：《上海口腔医学》2015年第6期660-666,共7页Shanghai Journal of Stomatology

基　　金：国家自然科学基金(81300903);四川省科技厅科技基金[(2010)19号2010JY0127]~~

摘　　要：目的 :根据三托槽弯曲实验原理,应用三维有限元方法研究唇舌侧弓丝力学性能的差异。方法 :建立槽沟均为0.022英寸的上颌切牙水平槽沟的Discovery唇侧托槽、垂直槽沟的第7代Kurz舌侧托槽共3颗,以及相应弓丝、结扎丝的三维有限元模型,分析不同弓丝材质、尺寸以及托槽间距下的唇舌侧弓丝的力学性能。结果:唇舌侧弓丝的载荷形变曲线图变化规律一致,主要由弓丝性质决定。弓丝材质对载荷的影响大于尺寸的影响,但小于两者的协同作用:舌侧弓丝载荷值随弓丝尺寸增大而增加(0.019×0.025英寸不锈钢丝载荷值约为同材质0.017×0.025英寸弓丝的1.46倍),但是该变化小于弓丝材质引起的变化(不锈钢丝载荷值约为同尺寸镍钛丝的2.73倍),更小于弓丝尺寸与材质共同改变所引起的变化(0.019×0.025英寸不锈钢丝的载荷值较0.017×0.025英寸镍钛丝增大约3.5倍)。在相同条件下,舌侧弓丝载荷值大于唇侧。随着托槽间距的增加,唇舌侧弓丝载荷值均减小(10 mm处加载时约为16 mm处的2.42倍,12、14 mm处分别为16 mm处的1.59倍及1.33倍),前期变化幅度较大,后期趋于稳定。结论:在相同条件下,舌侧弓丝载荷值大于唇侧,提示应当选择比唇侧弓丝直径更小、刚度更低的弓丝作为舌侧矫治弓丝。临床上在选择弓丝时,首先应考虑弓丝的材质,其次为尺寸,并注意两者的协同作用,注意托槽间距对弓丝性能的影响。PURPOSE： The purpose of this study was to investigate the mechanical property of lingual and labial archwires by using finite element method.METHODS： A three-dimensional finite element model including three maxillary left incisors of the 0.022-inch Dentaurum Discovery labial and Ormco 7th Generation lingual brackets was constructed and threaded with corresponding labial and lingual archwires.Then the arch wire ＇s mechanical property in different materials,sizes and space between brackets were analyzed.RESULTS： The load deflection curve of lingual archwire was similar to labial archwire at the same distance of brackets and mainly determined by the characters of archwire.The effects of the type of wire alloy were greater than dimension but less than the coordination of the two： the load value of lingual archwire increased when archwire size increased（the load value of 0.019 × 0.025 inch stainless steel wire was about 1.46 times as bigger as 0.017 × 0.025 inch one）,but this change was less than the material of archwire brought（the load value of stainless steel was about 2.73 times as bigger as the same size of titanium-nickel wire）,and was less than the coordination of the two（the load value of 0.019 × 0.025 inch stainless steel wire was about 3.5 times as bigger as 0.017 × 0.025 inch titanium-nickel wire）,the force of the lingual side was larger than the labial side at the same conditions,when the distance of brackets increased,both of them decreased gradually（the force loading on 10 mm,12 mm and 14 mm was about 2.42,1.59 and 1.33 times as bigger as on 16 mm,respectively）,faster in the early,later became stabilized.CONCLUSIONS： Lingual archwire should be in smaller diameter,lower stiffness than labial archwire.In choosing arch wire clinically,the material of arch wire should be considered first,followed by size and coordination of the two,meanwhile the distance of brackets should also be considered.

关 键 词：弓丝 力学性能 三托槽弯曲 三维有限元分析 

分 类 号：R783.5[医药卫生—口腔医学]