自從1960年代第一部雷射，紅寶石雷射，發明以來，雷射就被建議使用在口腔軟組織的處理。鉺雅鉻雷射在1997年被美國食品與藥物管理局認可運用在硬組織的處理。鉺雅鉻雷射可以較低的傷害下切割軟組織與硬組織，甚至有較好的癒合情況。此外，雷射照射也具有殺菌的效應，可以在低溫度傷害及組織破壞的情況下進行消毒，同時也對植體的維護有良好的效果。本文藉由了解鉺雅鉻雷射的基本性質與組織反應，以文獻回顧的方式，來了解鉺雅鉻在各種牙科治療中 扮演的角色與優缺點。

Since the first laser device Ruby laser was created in 1960s, lasers have been introduced to the management of soft tissue. The erbium-doped yttrium aluminium garnet (Er:YAG) laser was approved for the hard tissue management in dentistry by Food and Drug Administration in 1997. Recently, it has demonstrated for the effective elimination of soft and hard tissue with minimal damage and even or faster wound healing. In addition, the irradiation with Er:YAG laser has a bactericidal effect which can be used to sterilize gingival pocket with low thermal damage and be effective for the maintenance of dental implant. This review reveals the basic character of high absorption coefficients of water and the clinical dental management of Er:YAG laser.