患者杨×,男,39岁,工人。因左上8龋齿经常疼痛要求拔除。检查:8牙冠大部龋蚀,有点隙穿髓,探痛(+),叩痛(-),不松动,局部牙龈无炎症,全身无慢性病史。临床诊断:8慢性牙髓炎。治疗:8局麻下拔除。麻醉使用2%盐酸普鲁卡因肾上腺素3ml 作左侧上颌结节传导麻醉和左腭大孔浸润麻醉,该牙在拔除过程中比较困难,拔出后发现有4只根。拔牙后当日晚上(约拔牙后2～3小时)出现创口轻度 Patient Yang ×, male, 39 years old, worker. Because of the upper left 8 dental caries often require removal of pain. Check: Most of the coronoid crown, a little gap through the pulp, pain (+), percussion pain (-), no loosening, no inflammation of the local gingival, systemic chronic disease history. Clinical diagnosis: 8 chronic pulpitis. Treatment: 8 under local anesthesia removed. Anesthesia 2% procaine hydrochloride epinephrine 3ml for left maxillary nodule conduction anesthesia and left vena foramen magnum infiltration anesthesia, the tooth extraction process is more difficult to pull out and found four roots. The day after tooth extraction (about 2 to 3 hours after tooth extraction) there is mild wound