下唇麻木是下齿槽神经麻醉或受损时的临床表现,其病因较复杂,临床常有误诊。我科近年收治两例下唇麻木患者,现报告如下。病例一:男性,43岁,因左下唇麻木3天就诊。门诊检查:一般情况良好,颜面对称无畸形。面部皮肤无异常。牙列完整。咬合关系正常,口腔粘膜无异常,左下7合面银汞补,牙体变色,无松动、无叩痛,左下唇痛觉及温觉消失(颏神经分布区)。追问病史,患者曾于2年前因左下牙疼痛而在外院行牙髓治疗。左下7X 片示髓腔呈充填改变。根管未予充填,远中根尖有一0.8×0.6cm阴影。形态 Lower lip numbness is the clinical manifestations of the lower alveolar nerve anesthesia or damage, its etiology is more complicated, often misdiagnosed clinically. In recent years, our department admitted two cases of lower lip numbness, are as follows. Case 1: Male, 43 years old, numb for 3 days due to left lower extremity treatment. Out-patient examination: generally good, facial symmetry without deformity. No abnormal facial skin. Complete dentition. Occlusal relationship is normal, no abnormal oral mucosa, the lower left 7 meet silver-mercury fill, tooth discoloration, no looseness, no percussion pain, left lower lip pain and temperature sensation disappeared (mental nerve distribution). Asked about the medical history, the patient had dental pulp treatment in the lower hospital two years ago because of pain in the left lower quadrant. The lower left 7X shows the filling cavity changes. Root canal was not filled, distal root tip a shadow of 0.8 × 0.6cm. form