根管充填料超出根尖孔,轻者能引起炎症,重者则产生一系列神经毒性反应。在治疗下颌后牙时,尤可发生下齿槽神经及其分支颏神经等并发症。作者报告1例42岁患者,因左下颌第一磨牙根管治疗后,左下中切牙到左下第二前磨牙颊侧龈组织区感觉丧失。经抗生素、止痛药治疗不见好转。拍片显示左下 Root canal filling material beyond the apical foramen, light can cause inflammation, severe cases have a series of neurotoxic reactions. In the treatment of mandibular posterior teeth, especially in the occurrence of lower alveolar nerve and its branches, such as mental complications. The authors report a case of 42-year-old patient with a loss of sensation in the buccal gingival tissue area of ​​the second premolar lower left lower incisor after root canal treatment of the first mandibular first molar. After antibiotics, painkillers did not improve treatment. Film shows bottom left