患者，男性，32岁。1992年10月忽感左上前牙疼痛，在我科诊断为“2根尖周炎”，作根管治疗疼痛消失。1995年8月8日左上前牙区肿痛，来我料复诊为“左上颌含牙囊肿并感染”，给予切开排脓引流，抗生素治疗肿痛消失，要求手术。患者1979年因乳牙松动，曾在外院拔除，作活动义齿修 Patient, male, 32 years old. In October 1992, I felt pain in the left upper front tooth. In our department, I was diagnosed as having “2 periapical periodontitis,” and the root canal treatment disappeared. On August 8, 1995, the upper left anterior area was sore and painful. I came back to have the diagnosis of “dental cysts and infections in the upper left jaw.” The patients were treated with incision and drainage, antibiotics to relieve swelling, and surgery. The patient was removed in the outer court in 1979 because of loose teeth.