患者,男,46岁,农民。1月前8~(1/2)牙龈肿胀,疼痛,经用青链霉素肌注数日后肿胀消退,要求拔除患牙于1986年10月22日来我科就诊。查:张口略受限,8~(1/2)舌向水平阻生,牙冠约1/4外露,牙龈略充血,无盲袋形成,牙周无脓性分泌物,余无异常。左下颌骨侧位片显示:8~(1/2)舌向水平阻生,融合冠影像,7~(1/2)单根,远中牙槽骨垂直吸收2/8,近中牙槽骨水平吸收1/3 Patient, male, 46 years old, farmer. 1 month ago 8 ~ (1/2) swollen gums, pain, swollen with streptomycin intramuscular injection after a few days to regain, requiring the removal of teeth in October 22, 1986 to our department. Check: Zhang mouth slightly limited, 8 ~ (1/2) tongue impacted to the level of about 1/4 of the crown exposed, slightly gingival hyperemia, no blind pocket formation, no purulent periodontal secretions, I was no exception. The left mandibular lateral radiographs showed that the level of 8 ~ (1/2) tongue was impacted, the coronal images were fused, the single root was 7 ~ (1/2), vertical absorption of distal alveolar bone was 2/8, Bone level absorption 1/3