In order to investigate the clinical efficacy, all the teeth with acute apical periodontitis were divided into two group,one was treated with CRD(22 teeth) , the other was control group (24 teeth)with usual drug ,including oral medication.

• 为了解自制CRD材料的临床疗效，本研究分析了46例龋源性单根管急性根尖周炎的患牙，其中22例用自制材料治疗，24例常规治疗作对照。