弯曲构形对不锈钢圆丝矫治器刚度的影响研究

目的探讨不同的弯曲构形对不锈钢圆丝矫治器刚度的影响规律。方法采用自行研制的微型正畸弓丝测试仪，将直径为0.36、0.41、0.46 mm的不锈钢圆丝按既定的弯曲参数弯制成跨度相同的匣形曲、双水平曲和双垂直曲，行加载实验，研究其载荷形变规律。结果在弓丝尺寸、跨度相同的情况下，直径为0.36、0.41、0.46 mm的匣形曲、双水平曲、双垂直曲相比较，其矫治器刚度递增。结论弯曲的构形对矫治器刚度有显著的影响，匣形曲、双水平曲、双垂直曲三者相比，匣形曲的力学性能最佳。匣形曲能够产生轻而持续的、可控的矫治力，且0.41 mm的匣形曲在产生0.01～0.02 N·m最适力矩时，有合适的激活范围。临床上在矫正个别轻、中度倾斜错位牙时，宜首选0.41 mm的匣形曲不锈钢圆丝。

Effect of loop configuration on appliance stiffness of stainless steel round wire

Objective To investigate the effect of loop configuration on appliance stiffness of stainless steel round wire. Methods Some stainless steel round wires with various cross-sectional dimension(0.36, 0.41, 0.46 mm) were selected. Box loops, double horizontal loops, and double vertical loops were manufactured according to established parameters, and loading experiments were carried out with a micro-orthodontic archwire testing apparatus. Results When the cross-sectional dimension and the span were identical, t...