结论：甲硝唑在感染根管治疗中有明显疗效。
CONCLUSION: Met shows obvious therapeutic effects on infectious root canal.
目的观察氢氧化钙对感染根管消毒的抗菌效果。
Objective To observe the antibacterial effect of calcium hydroxide in sterilization of infected root canals.
结论：氢氧化钙可以明显降低感染根管中的内毒素含量。
CONCLUSION: Contents of bacterial endotoxin in the infections root canals can be cut down obviously with calcium hydroxide treatment.
目的为临床应用敏感药物治疗感染根管提供细菌学依据。
Objective To provide bacteriological basis for curing infected root canals with sensitive drugs.
结果：对照组：感染根管牙本质小管形态不规则，排列紊乱。
Results: Control group: the dentinal tubules lined up in disorder and irregularity.
方法对5 6例感染根管进行细菌培养，并用琼脂稀释法，对细菌进行药敏试验。
Methods We have made bacterial cultivation for 56 cases with infected root canals and drug sensitive test with agar dilution.
补了以后就可以把根管封住，不再受到感染。
The filling will seal the canal and prevent it from becoming infected again. .
结果根管治疗失败的主要原因为根管继发感染、根尖超填及根尖周机械损伤。
Results Secondary infection of the root tubes , apex overfilled and peripheral mechanical injury were main failure factors in the treatment of root tubes .
粪肠球菌是顽固性和继发性根管感染中最易分离到的细菌，其主要致病机制之一是形成生物膜。
Enterococcus faecalis (E. faecalis) is most frequent isolated from teeth with failed endodontic treatment. Biofilm-formation is one of the most important pathogenic mechanisms in post-treatment teeth.
粪肠球菌是顽固性和继发性根管感染中最易分离到的细菌，其主要致病机制之一是形成生物膜。
Enterococcus faecalis (E. faecalis) is most frequent isolated from teeth with failed endodontic treatment. Biofilm-formation is one of the most important pathogenic mechanisms in post-treatment teeth.
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