患者:杨某,男,42岁,左面部阵发性剧烈疼痛一年,疼痛发作时持续一分钟左右,触摸下唇或进食,说话时诱发疼病,口腔及面部检查未见异常。X线检查,见左下颌骨颜孔前有一类似牙状密度增高区。以2％利多卡因5ml行下牙槽神经阻滞麻醉,左下颌龈颊淘切口,在颜孔前见一金属异物完全嵌入骨 Patient: Yang, male, 42 years old, with severe paroxysmal pain on the left side for one year, pain lasting for about a minute, touching the lower lip or eating, pain when speaking, no abnormal oral and facial examination. X-ray examination, see the left mandibular face before a similar density of odontoid area. 2ml lidocaine 5ml line alveolar nerve block anesthesia, left jaw gingival buccal incision, in front of the color hole see a metal foreign body completely embedded in the bone