Abstract: Root canal irrigation is considered to be the most effective method for cleaning and disinfecting root canals. In recent years，the theory of kinematic activation irrigation has become a hot topic，with passive ultrasonic irrigation being the most widely used in clinical practice. Passive ultrasonic irrigation is divided into two modes：intermittent ultrasonic irrigation and continuous ultrasonic irrigation. This article introduces the principles of passive ultrasonic root canal irrigation and the advantages and disadvantages of the two modes.

Key words: passive ultrasonic irrigation, continuous ultrasonic irrigation, intermittent ultrasonic irrigation, biofilm, dentine debris

摘要： 根管冲洗被认为是根管清理和消毒最有效的方法。近年来，动能活化冲洗理论成为热点，其中被动超声冲洗在临床上应用最为广泛。被动超声冲洗分为间断超声荡洗和连续超声冲洗两个模式。文章就被动超声冲洗的原理及两种模式做一介绍。

关键词: 被动超声冲洗, 连续超声冲洗, 间断超声荡洗, 生物膜, 牙本质碎屑