各种托槽和弓丝组合的静摩擦力和表面粗糙度。

Static frictional force and surface roughness of various bracket and wire combinations.

机构信息

Department of Orthodontics, Government Dental College and Hospital, Nagpur, Maharashtra, India.

出版信息

Am J Orthod Dentofacial Orthop. 2011 Jan;139(1):74-9. doi: 10.1016/j.ajodo.2009.02.031.

DOI:10.1016/j.ajodo.2009.02.031

PMID:21195280

Abstract

INTRODUCTION

During sliding mechanics, frictional resistance is an important counterforce to orthodontic tooth movement, which must be controlled to allow application of light, continuous forces. We investigated the static frictional resistance between 3 modern orthodontic brackets-ceramic with gold-palladium slot, ceramic, and stainless steel-and 4 archwires (0.019 × 0.025-in)-stainless steel, nickel-titanium, titanium-molybdenum alloy (TMA), and low-friction colored TMA.

METHODS

All tests were carried out in a dry state on a universal testing machine. Surface topography of bracket slots and archwires was studied by using a scanning electron microscope and quantified by using a surface roughness testing machine (profilometer).

RESULTS

In the scanning electron microscope measurements, the smoothest surface was the ceramic gold-palladium bracket and stainless steel wire. The profilometer quantified the surface roughness, which also was lowest for the ceramic gold-palladium bracket and stainless steel wire. The ceramic bracket with the gold-palladium slot showed the least frictional values in all combinations and could be a promising alternative to solve the problem of friction. Frictional values for colored TMA were comparable with stainless steel wires and might be a good alternative during space closure in sliding mechanics.

CONCLUSIONS

Ceramic with gold-palladium slot bracket and colored TMA archwire seem to be a good alternative to stainless steel in space closure with sliding mechanics.

摘要

简介

在滑动机制中，摩擦阻力是正畸牙齿移动的一个重要反作用力，必须加以控制，以允许施加轻力和持续力。我们研究了 3 种现代正畸托槽（带金钯槽的陶瓷、陶瓷和不锈钢）和 4 种弓丝（0.019×0.025 英寸）-不锈钢、镍钛、钛钼合金（TMA）和低摩擦彩色 TMA 之间的静态摩擦阻力。

方法

所有测试均在万能试验机上的干燥状态下进行。使用扫描电子显微镜研究托槽槽和弓丝的表面形貌，并使用表面粗糙度试验机（轮廓仪）对其进行定量分析。

结果

在扫描电子显微镜测量中，表面最光滑的是陶瓷金钯托槽和不锈钢丝。轮廓仪量化了表面粗糙度，陶瓷金钯托槽和不锈钢丝的表面粗糙度也最低。带金钯槽的陶瓷托槽在所有组合中显示出最小的摩擦值，可能是解决摩擦问题的一种有前途的替代方案。彩色 TMA 的摩擦值与不锈钢丝相当，在滑动机制的间隙关闭中可能是一个很好的替代方案。