Ghadirian Hannaneh, Geramy Allahyar, Keshvad Mohammad Ali, Heidari Soolmaz, Chiniforush Nasim
Assistant Professor of Orthodontics, Department of Orthodontics, Tehran University of Medical Sciences, Tehran, Iran.
Professor of Orthodontics, Department of Orthodontics, Tehran University of Medical Sciences, Tehran, Iran.
J Lasers Med Sci. 2021 Mar 14;12:e13. doi: 10.34172/jlms.2021.13. eCollection 2021.
Ceramic brackets have gained increasing popularity among dental clinicians and orthodontic patients but friction is a major concern when using them. This study sought to assess the effects of diode and Nd:YAG (neodymium-doped yttrium aluminum garnet) laser irradiation on friction forces between two types of ceramic brackets and rhodium-coated esthetic archwires. Thirty polycrystalline and 30 poly-sapphire brackets were divided into 6 groups (n=10) as follows: (I) control polycrystalline brackets (no laser irradiation), (II) polycrystalline brackets subjected to diode laser irradiation, (III) polycrystalline brackets subjected to Nd:YAG laser irradiation, (IV) control poly-sapphire brackets (no laser irradiation), (V) poly-sapphire brackets subjected to diode laser irradiation, and (VI) poly-sapphire brackets subjected to Nd:YAG laser irradiation. The bracket slots were laser-irradiated on a custom-made table. Sixty 5-cm pieces of rhodium-coated archwires were used for the friction test in a universal testing machine at a speed of 10 mm/min. Ten brackets from the six groups underwent scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX). The frictional resistance value of polycrystalline brackets was significantly higher than that of poly-sapphire brackets, irrespective of laser type ( <0.05). Irradiation of diode and Nd:YAG lasers, compared with the control group, had no significant effect on friction, irrespective of bracket type ( >0.05). It appears that diode and Nd:YAG laser irradiation cannot significantly decrease the friction. Future studies are warranted on different laser types with variable exposure.
陶瓷托槽在牙科临床医生和正畸患者中越来越受欢迎，但使用时摩擦力是一个主要问题。本研究旨在评估二极管激光和钕钇铝石榴石（Nd:YAG）激光照射对两种类型陶瓷托槽与镀铑美观弓丝之间摩擦力的影响。将30个多晶托槽和30个多蓝宝石托槽分为6组（n = 10），如下：（I）对照多晶托槽（无激光照射），（II）接受二极管激光照射的多晶托槽，（III）接受Nd:YAG激光照射的多晶托槽，（IV）对照多蓝宝石托槽（无激光照射），（V）接受二极管激光照射的多蓝宝石托槽，以及（VI）接受Nd:YAG激光照射的多蓝宝石托槽。托槽槽沟在定制台上进行激光照射。60根5厘米长的镀铑弓丝用于在万能试验机中以10毫米/分钟的速度进行摩擦测试。对6组中的10个托槽进行扫描电子显微镜（SEM）、X射线衍射（XRD）和能量色散X射线光谱（EDX）分析。无论激光类型如何，多晶托槽的摩擦阻力值均显著高于多蓝宝石托槽（<0.05）。与对照组相比，二极管激光和Nd:YAG激光照射对摩擦力均无显著影响，无论托槽类型如何（>0.05）。看来二极管激光和Nd:YAG激光照射不能显著降低摩擦力。有必要对不同类型的激光和可变照射进行进一步研究。
