正畸托槽与弓丝间摩擦力性能的实验研究

摘要

目的 探讨正畸托槽与弓丝间摩擦力大小的影响因素.方法 选取2种尖牙托槽与2种尺寸不锈钢弓丝组成6组"托槽-弓丝"组合,测试不同托槽-弓丝成角下摩擦力值大小,并进一步计算出临界角值.结果 托槽-弓丝成角小于临界角时,摩擦力值保持平稳,随角度的增加变化不大;成角大于临界角后,摩擦力随角度的增加出现上升,并基本保持线性上升.各组托槽与弓丝间的摩擦力值不相同,临界角的大小也有差异.结论 临界角对托槽与弓丝间摩擦力大小影响显著,角度值与托槽的结构设计和弓丝尺寸相关.%Objective To study the friction between brackets and archwires and the influential factors. Methods To test the friction of six combinations of canine bracket and stainless steel archwire, and to calculate the critical contact angles for each combination. Results The friction maintains stability with slight changes when the contact angle is smaller than the critical contact angle. The friction increases linearly when the contact angle is larger than the critical contact angle. The friction of different combinations of bracket-archwire are different and the critical contact angles are also different. Conclusion The critical contact angle influences the friction between bracket and archwire significantly. The critical contact angle is relevant to both the structure of the bracket and the size of the archwire.