结论一次性根管治疗术是节省时间行之有效的治疗方法。
Conclusion One appointment root canal therapy is a safe, time saving, and economic RCT method.
目的：探讨慢性根尖周炎患者进行一次性根管治疗术的急性发作原因和预防措施。
Objective To evaluate and compare the efficacy of calciun hydroxide or formocresol as an intracanal medicament in root canal therapy of periapical periodontitis teeth.
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