患者,男,17岁。6年前由于上前牙间隙过大并用橡皮条结扎。结扎后半月发现牙龈肿胀,疼痛。此时家属发现橡皮条不见。经肌注青霉素1周,肿胀消退。后来反复肿胀,多次到医院治疗,诊断为炎症继续抗炎 Patient, male, 17 years old. 6 years ago because the gap between the anterior teeth is too large and lined with rubber strips. Half a month after ligation found swollen gums, pain. At this point the family did not see the eraser. After penicillin for 1 week, the swelling subsided. Repeated swelling later, many times to the hospital for treatment, diagnosis of inflammation continue to be anti-inflammatory