Chaturvedi T P, Upadhayay S N
Department of Orthodontics, Faculty of Dental Sciences, Institute of Medical Sciences, Varanasi, UP, India.
Indian J Dent Res. 2010 Apr-Jun;21(2):275-84. doi: 10.4103/0970-9290.66648.
Various types of metallic orthodontic appliances are used in the management of malocclusion. These appliances are placed in oral environment under many stresses and variations such as masticatory forces, appliance loading, temperature fluctuations, varieties of ingested food and saliva. These metals undergo electrochemical reactions with the oral environment resulting in dissolution or formation of chemical compounds. Various microorganisms and many aggressive ions containing oral environment can cause material degradation (corrosion) and its associated problems during long time exposure. Orthodontic alloys must have excellent corrosion resistance to the oral environment, which is highly important for biocompatibility as well as for orthodontic appliance durability. This article reviews various aspects of corrosion (surface degradation) of orthodontic alloys. It explores the emerging research strategies for probing the biocompatibility of materials. During orthodontic treatment, use of nickel free, better corrosion resistance alloys and less use of fluoride containing toothpaste or gel is expected.
各种类型的金属正畸矫治器用于错牙合畸形的治疗。这些矫治器置于口腔环境中，承受着多种应力和变化，如咀嚼力、矫治器负荷、温度波动、摄入食物的种类以及唾液等。这些金属与口腔环境发生电化学反应，导致溶解或形成化合物。在长时间暴露过程中，各种微生物以及许多含有侵蚀性离子的口腔环境会导致材料降解（腐蚀）及其相关问题。正畸合金必须对口腔环境具有优异的耐腐蚀性，这对于生物相容性以及正畸矫治器的耐久性都非常重要。本文综述了正畸合金腐蚀（表面降解）的各个方面。探讨了探究材料生物相容性的新兴研究策略。在正畸治疗期间，预计会使用无镍、耐腐蚀性更好的合金，并减少含氟牙膏或凝胶的使用。
