摘要
目的 探讨切牙转矩定量的控制规律。方法 使用转矩测量仪 ,对横截面积为 0 4 6mm× 0 6 3mm的平直不锈钢丝与钛镍丝 ,7 0mm高垂直曲不锈钢丝 ,3 0mm长和 6 0mm长L形水平曲不锈钢丝 ,在单个 0 5 6mm中切牙托槽内的转矩力矩与扭转角度进行测量与分析。结果 (1)这些弓丝的抗扭刚度分别为 4 90 9、1 32 5、4 137、3 4 4 8和 3 0 2 4N·mm/度 ;(2 )转矩力矩达到2 0N·mm时 ,上述弓丝将分别扭转 19 14 3、36 832、19 85 1、2 1 812和 2 2 4 18度 ;(3)不锈钢丝和钛镍丝的转矩余隙角分别为 15 0 7度和 2 1 73度 ;(4)曲能起到降低不锈钢丝的抗扭刚度、增加弓丝弹性范围的作用 ,其中以水平曲的效用更优。结论 平直不锈钢丝不是控制切牙转矩的理想选择。曲 ,特别是水平曲 ,能显著降低弓丝的转矩刚度。
Objective To evaluate the properties of orthodontic rectangular arch wires in torsion Methods To measure and analyze the torsional moments and angles of 0.46 mm×0.63 mm rectangular orthodontic arch wires in single 0.022 inch bracket of the maxillary central incisor with a torsion measurement apparatus. Results (1) The torsional stiffness of stainless steel arch wires, Chinese nitinol arch wires,7.0 mm vertical loop arch wires, 3.0 mm and 6.0 mm horizontal loop arch wires is 4.909, 1.325, 4.137, 3.448 and 3.024 Nmm per degree, respectively. (2) The arch wires will be twisted 19.143, 36.832, 19.851, 21.812 and 22.418 degrees; respectively to obtain optimal force. (3) Vertical and horizontal loop decreased the torsional stiffness of the rectangular stainless steel arch wire. Conclusion The straight rectangular stainless steel arch wire is not well suitable for the torque control of the incisor. Loop design in arch wire is capable of decreasing torsional stiffness. The horizontal loop is more effective than vertical loop.
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2004年第2期104-107,共4页
Chinese Journal of Stomatology
