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根管治疗术被普遍认为是去除根管内炎症牙髓及感染物质的最有效方法，然而初次根管治疗的成功率为85%~90%，再治疗成功率则更低，其失败的原因主要与根管内持续感染的存在有关。因此，有效的完成根管预备与消毒是保证根管治疗成功的关键。 Er：YAG(铒钇铝石榴石)激光是一种波长为2.94μm的固体脉冲激光，其在口腔医学领域的应用开始于1964年，并于2002年被FDA批准用于根管治疗的根管清理和消毒。此后研究进一步证实，用Er：YAG激光进行根管预备和消毒可有效去除根管内感染，具有很好的临床应用前景。本文就Er：YAG激光在根管预备和消毒中的应用及其研究现状作一综述。“,”Root canal therapy is generally considered to be the most effective method for the treatment of in-flammation and infection of root canal, however, its success rate is 85% to 90% and even lower. The main reason of the failure is the existence of persistent infection, thus effectively complete root canal preparation and disinfection are the fundamental steps to a successful treatment. Er:YAG laser ( erbium:yttrium-aluminum-garnet) , first applied to the oral medicine in 1964 and approved for the use of root canal cleaning by FDA in 2002, is a kind of solid pulsed la-ser with a wavelength of 2. 94 microns. Er:YAG laser applied in root canal preparation and disinfection, can effective-ly remove the infection. This review gives the summary of the present researches and applications about Er:YAG laser used in root canal preparation and disinfection.