根管预备主要是通过器械切削和药物冲洗等方法,去除根管内的微生物及其代谢产物、感染的牙髓组织及牙本质碎屑,形成与特定根管充填物和充填方法相适应的形态。根管预备是根管治疗中重要且难度较大的步骤之一,其难点主要体现在以下几个方面:工作长度的确定;工作宽度的确定;根管 Root canal preparation is mainly through equipment cutting and drug washing and other methods to remove the root canal microorganisms and their metabolites, infected pulp and dentin debris to form a specific root canal filling and filling methods to adapt to the form . Root canal preparation is one of the most important and difficult steps in root canal therapy. The difficulties are mainly reflected in the following aspects: the determination of working length; the determination of working width; the root canal