根管治疗的目的是对整个根管系统严密充填,阻止口腔微生物及其代谢产物再次进入根管,预防根尖周病变和促进根尖周病变愈合。充填后微渗漏的大小是评价根管充填质量好坏的重要指标,目前最常用的评估根管封闭能力的实验方法是染色渗漏法、微生物渗漏法以及流体滤过法。此3种实验方法各有其优缺点,且尚未标准化。 The purpose of root canal therapy is to closely fill the entire root canal system to prevent oral micro-organisms and their metabolites into the root canal again, to prevent periapical lesions and promote periapical lesions heal. The size of the microleakage after filling is an important index to evaluate the quality of the root canal filling. At present, the most commonly used experimental methods for evaluating the sealing ability of the root canal are the dyeing leakage method, the microbial leakage method and the fluid filtration method. The three experimental methods have their own advantages and disadvantages, and has not standardized.