由于乳磨牙根管形态复杂，根管治疗术的操作步骤多，治疗时间长，且须多次就诊，儿童不易合作。笔者于1992年3月～1995年5月，对儿童乳磨牙急慢性根尖周炎，采用根管药物一次疗法，临床效果满意，报告如下。临床资料1．一般资料：本组病例为4—11岁门诊患儿，共143例146颗牙。 Due to the complex morphology of primary molar root canal, root canal treatment of many steps, the treatment time is long, and must be treated multiple times, children are not easy to cooperate. The author in March 1992 to May 1995, the children of primary molars with acute chronic apical periodontitis, a root canal drug therapy, the clinical results were satisfactory, the report is as follows. Clinical data 1. General Information: This group of patients aged 4-11 out-patient children, a total of 143 cases 146 teeth.