不同尺寸、不同摇椅曲度不锈钢方丝在Empower自锁托槽内摩擦力的实验分析  

An experimental study on frictional resistance of stainless steel archwires with different sizes and rocking chair curvature in Empower self-ligating brackets

作　　者：郭婧芳[1] 张千依 张楠[2] 唐冠群[1] 王秋玉[1] 朱宪春[1] 毛智[1] 

机构地区：[1]吉林大学口腔医院正畸科,吉林长春130061 [2]西安交通大学第一附属医院口腔科,陕西西安710061

出　　处：《口腔医学》2015年第5期333-337,共5页Stomatology

基　　金：吉林省卫生厅科研计划(2013Z053)

摘　　要：目的研究不同尺寸、不同摇椅曲度(rocking chair curvature,RCC)不锈钢方丝(stainless steel,SS)在Empower自锁托槽(Empower self-ligating brackets,Empower SLB)内所产生的摩擦力差异。方法选用由标准石膏模型翻制的标准牙牙合模型,并于干燥条件下在其上粘结Empower SLB及颊面管,分别测量按照在电镜下确定弓丝拉拔方向的两种尺寸SS(0.46 mm×0.64 mm、0.48 mm×0.64 mm),4种不同RCC(0°、5°、10°、15°),共8种弓丝-摇椅工况组合在滑动法关闭拔牙间隙时在Empower SLB内产生的摩擦力。结果两种尺寸弓丝分别在尖牙至第二前磨牙区加载0°、5°、10°、15°的RCC,得出以下结果:1所有工况下动摩擦力稍小于最大静摩擦力;2相同RCC下,0.46 mm×0.64 mm SS在自锁托槽内产生的滑动摩擦力小于0.48mm×0.64 mm SS(P<0.05);3相同尺寸弓丝随RCC(0°、5°、10°、15°)增加,滑动摩擦力(0.46 mm×0.64 mm SS:0<0.19 N<0.35 N<0.90 N;0.48 mm×0.64 mm SS:0<0.26 N<0.43 N<1.00 N)逐渐增大(P<0.05)。结论 SS在Empower SLB内的滑动摩擦力稍小于最大静摩擦力,弓丝尺寸越大、摇椅曲曲度越大,SS在自锁托槽内产生的摩擦力也越大。Objectives To study the friction forces of stainless steel（SS） archwires with different sizes and rocking chair curvature （RCC） in Empower self-ligating brackets （ Empower SLB） so as to guide the orthodontists＇ choice of the brackets and archwires. Meth- ods The standard occlusal plaster model was selected as the study model,and it was bonded with the Empower SLB and buccal tubes in a dry condition. Then the frictional forces of two rectangular SS archwire sizes （0.46 mm× 0.64 mm and 0.48 mm × 0.64 mm） with four RCC（0°,5°,10°,and 15°） which made 8 combinations were tested. Results According to the RCC of 0°,5°,10°,and 15° load- ed by 2 rectangular stainless steel（SS） archwire sizes from the canines to the secondary premolar segment, （ 1 ） In all combinations, dy- namic friction was slightly less than the maximum static friction; （2） With the same RCC,0.46 mm × 0.64 mm SS had less frictional force than 0.48 mm × 0.64 mm SS （ P 〈 0.05 ）. （ 3 ） Archwires of the some size increased as RCC （ 0°,5 °, 10°, 15° ） increased, and the frictional force also gradually increased （0.46 mm x 0.64 mm SS ：0 〈 0.19 N 〈 0.35 N 〈 0.90 N ; 0.48 mm ×0.64 mm SS ：0 〈 0. 26 N 〈 0.43 N 〈 1.00 N. P 〈 0.05）. Conclusions The dynamic friction is slightly less than the maximum static friction in Empower SLB. The frictional force gradually increased with the growing of SS sizes and RCC.

关 键 词：摩擦力 摇椅曲曲度 Empower自锁托槽 不锈钢弓丝 

分 类 号：R783.5[医药卫生—口腔医学]