患儿，王某、女、9岁．因在上后牙龋齿疼痛在外院治疗．诊断为左上颌第一、第二乳磨牙牙历炎，封失活剂两天后因疼痛，牙齿松动到我院儿科就诊．口腔检查：IK“V一邻面＄、丁氧育暂封药完好．叩（＋），松动回·．第一乳磨牙半脱位．颇腔恻牙＠红肿、少许糜烂．取出封药为失活 Children, Wang, female, 9 years old. Because of the dental caries in the back pain treatment. Diagnosis of the first left maxillary second molar teeth inflammation, seal deactivator two days after the pain, loose teeth to our pediatric clinic. Oral examination: IK "V Adjacent to the $, butochow incubation temporary closure intact. Knock (+), loose back · first molars dislocation. Quite caviar @ swelling, a little erosion. live