下颌第二磨牙畸形且埋伏阻生,临床上少见,我科遇到1例报告如下:患者王某,男,56岁。以左下后牙急性牙髓炎症状而就诊。检查:颌面部发育正常。牙列整齐,(?)缺如,但无拔牙史,(?)均一萌出。(?)远中牙龈发红,触痛不明显,其远中牙颈部可探及一牙冠样硬物。盲袋中有食物残渣,无脓。未探及龋。余牙正常。处理:摄(?)X 线牙片1张。发现(?)远中根中 Mandibular second molar deformity and ambush impacted, clinically rare, I encountered 1 case report as follows: Patient Wang, male, 56 years old. To lower left anterior teeth acute pulpitis symptoms and treatment. Check: Maxillofacial development is normal. Tooth neat, (?) Shortage, but no history of tooth extraction, (?) Eruption. (?) Gingival redness in the far, tenderness is not obvious, its distal teeth can be explored in the neck and a crown-like hard objects. Blind bags have food residue, no pus. Did not explore and caries. I have normal teeth. Treatment: photo (?) X-ray tooth piece. Found (?) Far in the root