Abstract：
A 29-year-old male patient reported for replacement of missing teeth. The patient gave history of unerupted right lower posterior teeth and the orthopantomogram revealed transmigrated mandibular second molar to the inferior border of mandible just below the root apices of second premolar associated with enostosis distally toward the ramus of mandible with size of about 21 mm Χ 20 mm. This rare interosseous defect plays a vital role in deciding prosthetic treatment options for missing teeth and utmost care should be taken to preserve the health of the patient during such procedures.
摘要：
一名29岁的男性患者报告更换缺失的牙齿。该患者有右下后牙未萌出的病史，正像图显示下颌第二磨牙向下颌骨下缘的迁移，正好在第二前磨牙的根尖下方，并伴随着内生症向下颌骨的远端，尺寸约为21毫米×20毫米。这种罕见的骨间缺损在决定缺失牙齿的修复治疗方案中起着至关重要的作用，在此类手术期间应格外小心以保护患者的健康。
