Institute of Oral Biology and Biomaterial, College of Oral Medicine, Chung Shan Medical University, Taichung, Taiwan, ROC.
Am J Orthod Dentofacial Orthop. 2011 May;139(5):594-600. doi: 10.1016/j.ajodo.2009.06.034.
Titanium nitride (TiN) plating is a method to prevent metal corrosion and can increase the surface smoothness. The purpose of this study was to evaluate the friction forces between the orthodontic bracket, with or without TiN plating, and stainless steel wire after it was corroded in fluoride-containing solution.
In total, 540 metal brackets were divided into a control group and a TiN-coated experimental group. The electrochemical corrosion was performed in artificial saliva with 1.23% acidulated phosphate fluoride (APF) as the electrolytes. Static and kinetic friction were measured by an EZ-test machine (Shimadazu, Tokyo, Japan) with a crosshead speed of 10 mm per minute over a 5-mm stretch of stainless steel archwire. The data were analyzed by using unpaired t test and analysis of variance (ANOVA).
Both the control and TiN-coated groups' corrosion potential was higher with 1.23% APF solution than with artificial solution (P <0.05). In brackets without corrosion, both the static and kinetic friction force between the control and TiN-coated brackets groups showed a statistically significant difference (P <0.05). In brackets with corrosion, the control group showed no statistical difference on kinetic or static friction. The TiN-coated brackets showed a statistical difference (P <0.05) on kinetic and static friction in different solutions.
TiN-coated metal brackets, with corrosion or without corrosion, cannot reduce the frictional force.
氮化钛（TiN）镀层是一种防止金属腐蚀的方法，同时可以提高表面的光滑度。本研究的目的是评估正畸托槽在腐蚀性氟化物溶液中腐蚀前后与不锈钢丝之间的摩擦力，其中托槽有的进行了氮化钛镀膜处理，有的则没有。
共有 540 个金属托槽被分为对照组和氮化钛镀膜实验组。电化学腐蚀在含有 1.23%酸性磷酸氟（APF）的人工唾液中进行，作为电解质。用 EZ-test 机器（日本岛津）以 10 毫米/分钟的十字头速度对不锈钢弓丝进行 5 毫米的拉伸，测量静态和动态摩擦力。数据通过配对 t 检验和方差分析（ANOVA）进行分析。
对照组和氮化钛镀膜组在 1.23% APF 溶液中的腐蚀电位均高于人工唾液（P<0.05）。在未腐蚀的托槽中，对照组和氮化钛镀膜组之间的静态和动态摩擦力均有统计学差异（P<0.05）。在腐蚀的托槽中，对照组在动力学或静态摩擦力方面没有统计学差异。而氮化钛镀膜组在不同溶液中的动力学和静态摩擦力均有统计学差异（P<0.05）。
无论是否有腐蚀，氮化钛镀膜金属托槽都不能降低摩擦力。
