Department of Orthodontics, Sri Sankara Dental College, Varkala, Trivandrum, Kerala, India.
Angle Orthod. 2012 Jan;82(1):22-9. doi: 10.2319/040811-251.1. Epub 2011 Jul 12.
To determine in vitro the frictional properties, surface morphology, and load deflection rate with looped designs of two newly developed titanium aluminum nitride (TiAlN) and tungsten carbide/carbon (WC/C) physical vapor deposition (PVD) coated beta titanium orthodontic archwires coated with PVD.
Frictional properties with Tidy's protocol, surface evaluation before and after friction testing with the help of scanning electron microscopy (ESEM), and load deflection rate with different orthodontic loops on Instron universal testing machine were evaluated.
The results clearly indicate reduced frictional properties for WC/C coated archwires when compared with uncoated and TiAlN coated archwires. There were no significant surface alterations upon ESEM evaluation of friction tested archwires. Low load deflection rate was exhibited by both coated archwires, the difference in load deflection rate between the coated and uncoated archwires was statistically significant.
WC/C coated wires can be recommended for even sliding mechanics due to reduced frictional properties, better surface characteristics, and low load deflection rate compared with TiAlN coated and uncoated archwires.
通过对两种新开发的钛铝氮（TiAlN）和碳化钨/碳（WC/C）物理气相沉积（PVD）涂层β钛正畸弓丝的环设计，在体外确定其摩擦性能、表面形貌和负载挠度率。
采用 Tidy 方案评估摩擦性能，借助扫描电子显微镜（ESEM）评估摩擦试验前后的表面评估，以及在 Instron 万能试验机上用不同正畸环评估负载挠度率。
结果清楚地表明，与未涂层和 TiAlN 涂层弓丝相比，WC/C 涂层弓丝的摩擦性能降低。ESEM 评估摩擦试验后的弓丝，未见明显表面变化。两种涂层弓丝的负载挠度率均较低，涂层弓丝和未涂层弓丝之间的负载挠度率差异具有统计学意义。
与 TiAlN 涂层和未涂层弓丝相比，WC/C 涂层丝由于摩擦性能降低、表面特性更好、负载挠度率低，因此可推荐用于更顺畅的滑动力学。
