摘要目的 探讨不锈钢方丝口腔内应用后表面摩擦力及表面形态变化.方法 在粘结托槽的模具上,分别测量口腔内使用前后不锈钢方丝在整体回收前牙时与托槽间产生的表面摩擦力.电镜观察不锈钢方丝使用前后表面形态的变化.结果 不锈钢方丝表面摩擦力使用3个月比未使用的增大,差异有显著性(P＜0.05),4个月、5个月的增加更大,差异有极显著性(P＜0.01).电镜观察,随着使用时间的增加不锈钢方丝表面光洁度降低,粗糙度明显增加.结论 不锈钢方丝随着使用时间的增加表面光洁度降低,摩擦力增加,提示我们矫治过程中应及时更换弓丝,或增加支抗.

abstractsObjective The purpose of this study was to investigate the changes of surface frictional forces and surface topography of used-stainles steel(ss) archwires. Method On the testing mandibular model,we measured the static and kinetic friction between the used and unused archwires at different time points and they were examined in the space closure phase. Surface topography of each type archwire was assessed by scanning electron microscope(SEM). Results The surfacial friction of ss archwires used three months are greater than the unused one (P＜0. 05), while much greater than that used after four and five months (P＜0. 01). SEM: The surfacial smooth finish of ss archwires were reduced with the longer time of use, whereas surface roughness were increased. Conclusion The roughness changes on the ss archwires' surfacial structure suggested us to change the archwires in time or increase the anchorage.