比较其根管充填物去除率、根管治疗期间的急症(EIAE)发生率。结果：根管充填物去除率方面，手用器械法和其他2法有统计学意义(P<0．001)，化学法与超声法之间无统计学意义。
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结果氢氧化钙封药后根管治疗期间急症的发生率最低，与传统药物相比，其差异有统计学意义。
Results A significant lower IAE frequency was recorded in calcium hydroxide group, when compared to those in CP and FC groups.
目的：探讨替硝唑复合糊剂和甲醛甲酚液对慢性根尖周炎根管治疗期间急症的疗效差异。
Objective: To observe the effects of tinidazole composite cataplasm and formaldehyde cresol solution on the incidence of acute inflammation in root canal treatment of chronic periodontitis patients.
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