【作者】 潘盛波；

【导师】 梁甲兴；

【作者基本信息】 福建医科大学 ， 口腔临床医学， 2008， 硕士

【摘要】 目的:通过测试不同结扎力下托槽弓丝间的摩擦力,测试Free-edge托槽、传统托槽与弓丝分别组合的摩擦力,测试不同表面粗糙度托槽弓丝组合的摩擦力,分析托槽与弓丝间摩擦力的影响因素,为临床合理选用托槽弓丝、合理选用结扎方式提供参考。方法:在干燥条件下,1、测试四种托槽和四种弓丝分别组合在四种结扎方式下的动、静摩擦力。2、测试两种Free-edge托槽、两种传统托槽和四种弓丝分别组合的动、静摩擦力。3、测试国产和进口托槽、弓丝分别组合的动、静摩擦力。结果:1、不同结扎力下托槽弓丝间的摩擦力有显著性差异(P<0.01),托槽弓丝组合的摩擦力随结扎力的增大而增大;橡皮圈结扎的摩擦力大于300g等效结扎力结扎的摩擦力,0.25mm不锈钢结扎丝紧结扎的摩擦力最大;橡皮圈结扎的等效结扎力值约为300g-500g,0.25mm不锈钢结扎丝紧结扎的等效结扎力值约为1500g-1800g。2、Free-edge托槽中间翼结扎的摩擦力极小,几乎为零,与Free-edge托槽六翼结扎和传统托槽四翼结扎均有统计学差异(P<0.01);Free-edge托槽六翼结扎的摩擦力大于传统托槽四翼结扎,在统计学上有显著性差异(P<0.01)。3、国产弓丝与国产托槽组合的摩擦力大于国产弓丝与进口托槽组合的摩擦力,在统计学上有显著性差异(P<0.01);进口弓丝与国产托槽组合的摩擦力小于进口弓丝与进口托槽的摩擦力,在统计学上有显著性差异(P<0.01)。结论:1、托槽弓丝组合的摩擦力随结扎力的增大而增大,橡皮圈结扎的等效结扎力值约为300g-500g,0.25mm不锈钢结扎丝紧结扎的等效结扎力值约为1500g-1800g。2、Free-edge托槽独特的六翼结构设计,即可结扎中间翼,实现低摩擦力,又可结扎六翼,产生高摩擦力,解决了低摩擦力与高牙齿控制能力的矛盾。Free-edge托槽改进了方丝弓系列固定矫正器的性能,该托槽的应用有利于临床矫正疗效的提高。。3、国产弓丝与国产托槽组合的摩擦力大于国产弓丝与进口托槽组合的摩擦力,而进口弓丝与国产托槽组合的摩擦力小于进口弓丝与进口托槽组合的摩擦力。更多还原

【Abstract】 Objectives: Through testing frictional force of combinations of brackets and archwires with different ligature force, testing frictional force of Free-edge brackets and conventional brackets coupled with different archwires, testing frictional force of combinations of brackets and archwires with different roughness, influencing factor of frictional force of combinations of brackets and archwires was analyzed, which could provide reference to select brackets、archwires and the type of ligation reasonably.Methods: In the dry states, the static and kinetic frictional force of combinations of 4 kinds of brackets and 4 kinds of archwires with 4 different kinds of ligature forces was tested, the static and kinetic frictional force of combinations of 2 kinds of Free-edge brackets and 2 kinds of conventional brackets coupled with 4 kinds of archwires were tested, the static and kinetic frictional force of combinations of Chinese made brackets and archwires coupled with imported brackets and archwires was tested.Results: 1. The frictional force of combinations of brackets and archwires had statistical significant difference among different ligature force(p<0.01), the frictional force of combinations of brackets and archwires increased with ligature force, the couples ligated with elastomeric O-rings had greater frictional force than those tied with the equivalent normal force of 300g, the couples ligated with 0.25mm stainless steel ligature wires had greatest frictional force, when the brackets were ligated with elastomeric O-rings ,the equivalent normal force was approximately 300g-500g, when the brackets were ligated with 0.25mm stainless steel ligature wires, the equivalent normal force was approximately 1500g-1800g. 2. The frictional force of Free-edge bracket ligated with middle wings was small to zero, there were statistical significant difference compared with both Free-edge bracket ligated with six wings and conventional bracket ligated with four wings(p<0.01); Free-edge bracket ligated with six wings had greater frictional force than conventional bracket ligated with four wings, there were statistical significant difference between them(p<0.01). 3. The combinations of Chinese made archwires coupled with Chinese made brackets had greater frictional force than those of Chinese made archwires coupled with imported brackets, there were statistical significant difference between them(p<0.01);but the combinations of imported archwires coupled with Chinese made brackets had lower frictional force than those of imported archwires coupled with imported brackets, there were statistical significant difference between them(p<0.01).Conclusions: 1. The frictional force of combinations of brackets and archwires increased with ligature force, when the brackets were ligated with elastomeric O-rings ,the equivalent normal force was approximately 300g-500g, when the brackets were ligated with 0.25mm stainless steel ligature wires, the equivalent normal force was approximately 1500g-1800g. 2. Free-edge bracket had unique ligature structure with six wings, which not only could be ligated with middle wings generating low frictional force, but also be ligated with six wings generating great frictional force, it solved the contradiction between less frictional force and better tooth control, it improved the capability of the series of edgewise fixed appliance, the application of it would increase the effectiveness of orthodontic treatment. 3. The combinations of Chinese made archwires coupled with Chinese made brackets had greater frictional force than those of Chinese made archwires coupled with imported brackets, the combinations of imported archwires coupled with Chinese made brackets had lower frictional force than those of imported archwires coupled with imported brackets.更多还原