患者,女,38岁。■被击落40小时后用清水洗净,刮除牙根表面残存牙周膜和污物,置0.25％氯霉素液内浸泡40分钟。根管常规处理后用牙胶尖氧化锌丁香油糊剂充填。再用0.5％可的松液浸泡半小时放入 Patient, female, 38 years old. ■ After being shot down for 40 hours, rinse with water, remove residual periodontal ligament and dirt on the root surface, and soak in 0.25% chloramphenicol solution for 40 minutes. Root canal conventional treatment with gutta-percha point zinc oxide clove oil paste filling. Then 0.5% cortisone solution soak for half an hour into