Abstract: Pit and fissure sealant has been proved to be an effective method for caries prevention which is without pain，harm or damage to teeth. The procedures of pit and fissure sealant are as follows：cleaning，etching，washing and drying，sealant painting，solidification and inspection. The efficiency of caries prevention by pit and fissure sealant is associated with the retention of sealant，which is related to the clinical procedures，sealant materials and the techniques.

Key words: pit and fissure sealant, caries prevention

摘要： 窝沟封闭作为一种无痛、无害、无创伤的技术，是预防窝沟龋的有效方法。操作步骤包括：清洁、酸蚀、冲洗和干燥、涂布封闭剂、固化、检查。窝沟封闭的防龋效果与封闭剂的保留率直接相关，窝沟封闭的相关操作技术、材料的性能都是与窝沟封闭效果密切相关的因素。

关键词: 窝沟封闭, 龋病预防