CAJ | 학술논문

目的对四种托槽和两种弓丝滑动前后进行外貌和槽沟微观形貌的分析,探讨影响托槽与弓丝间摩擦力大小的因素.方法对四种托槽用立体显微镜对外观形貌及其与两种弓丝滑动前后扫描电镜的微观形貌进行观察,用微硬度测量仪测量四种托槽槽沟、托槽体部位的硬度.结果四种托槽形貌及滑动前后槽沟部位的微观形貌不同,硬度也有差异,硬度由小到大分别为A托槽的金属槽沟部位(F)213.72±57.33HV,D托槽305.76±46.65HV,B托槽1 087.12±139.86HV,A托槽体部1 111.26±182.52HV,C托槽1 309.81±225.56HV.结论硬度和表面粗糙度是影响托槽与弓丝间摩擦力的因素.陶瓷托槽硬度大,表面粗糙,与金属弓丝间的摩擦力大.
목적 대사충탁조화량충궁사활동전후진행외모화조구미관형모적분석,탐토영향탁조여궁사간마찰력대소적인소.방법 대사충탁조용입체현미경대외관형모급기여량충궁사활동전후소묘전경적미관형모진행관찰,용미경도측량의측량사충탁조조구、탁조체부위적경도.결과 사충탁조형모급활동전후조구부위적미관형모불동,경도야유차이,경도유소도대분별위A탁조적금속조구부위(F)213.72±57.33HV,D탁조305.76±46.65HV,B탁조1 087.12±139.86HV,A탁조체부1 111.26±182.52HV,C탁조1 309.81±225.56HV.결론 경도화표면조조도시영향탁조여궁사간마찰력적인소.도자탁조경도대,표면조조,여금속궁사간적마찰력대.
Objective To study the structure factors influencing the frictional characteristics of the brackets and archwire.Methods Observation of the morphology of bracket and microstructure of the brackets' slots were conducted with stereo microscope and scanning electron microscope (SEM) before and after sliding along the archwires.Hardness measurement of four brackets were done with microhardness tester.The results were statistically analyzed with one-way analysis of variance and Student-Newman-Keuls multiple comparison test at the 0.05 level of significance.Results Morphological observations showed a great variability in the bracket and bracket slot microstructure among the brackets tested,as well as before and after sliding.Vickers hardness of the brackets were as follows,metal slot of A(F) 213.72±57.33,D 305.76±46.65,B 1087.12±139.86,A 1111.26±182.52,C 1309.81±225.56,which showed great variations among the brackets.Conclusions There were significant differences in the morphology,microstructure,and microhardness among the brackets tested,which might anticipate that hardness and roughness were two influencing factor for the friction between bracket and archwire.The rougher surface and higher hardness of the ceramic bracket caused the higher friction force.