镍钛矫正弓丝机械性能随临床使用时间变化的研究  

The changes of mechanical properties of nickel-titanium wires after being used in vivo for different duration

作　　者：任超超[1] 白玉兴[1] 王红梅[1] 秦晓桐[2] 厉松[1] 

机构地区：[1]首都医科大学附属北京口腔医院正畸科,100050 [2]北京理工大学理学院力学系

出　　处：《北京口腔医学》2008年第2期87-90,共4页Beijing Journal of Stomatology

基　　金：首都医学发展科研基金(2005-2018)

摘　　要：目的比较常用镍钛矫正弓丝在临床使用不同时间后机械性能改变。方法采用模拟口腔温度(37℃)三点弯曲试验装置,分别检测临床使用1个月、2个月、3个月以及未经使用镍钛矫正弓丝变形程度(位移)与弓丝产生的回复力(载荷)之间的关系,分析和评价镍钛矫正弓丝临床使用不同时间后的机械性能改变。结果滞后值随着临床使用时间的增加而减少,未经临床使用的镍钛矫正弓丝滞后值明显低于经临床使用1个月后的镍钛丝,平台期载荷值随着临床使用时间的延长呈总体下降趋势。超弹性性能并没有随着临床治疗时间的增加而有改变。结论随着临床使用的增加,镍钛矫正弓丝的机械性能产生明显的变化,性能有所衰减,使用2个月后其衰减更显著。超弹性的特性没有改变,仍然符合临床治疗的需要。Objective To study the changes of mechanical properties of nickel-titanium wires after being used in vivo for different duration. Methods after being used in patients＇ mouth for l month , 2 months and 3 months, the0.016 inch nickel-titanium arch wires were then tested using 3-point bending test method under 37℃ to investigate the loaddeflection characteristics. Results The value of hysteresis of new wires was significantly smaller than that of the wires which were used for 1 month. The load value during plateau was decreasing with time. The superelastic characteristic did not change with time. Conclusion There was a significant change of the mechanical properties of nickel-titanium arch wires after being used for different duration, which attenuated more markedly after 2 months of use, but superelastic characteristic still remained.

关 键 词：镍钛 机械性能 衰减 三点弯曲 超弹性 

分 类 号：R783.1[医药卫生—口腔医学]