下颌神经管三维CT定位在下颌角截骨整形术中的应用

目的 准确定位下颌神经管,以减少下颌角弧形截骨整形术中下齿槽神经血管束损伤的几率.方法 对30例青年女性下颌角肥大患者行下颌骨螺旋CT扫描、三维重建,定点后测量下颌神经管下缘在各点距下颌牙牙冠的距离.术中应用钢尺测量定位其在下颌骨体外表面的投影.指导截骨.术中、术后观察下颌神经管的完整性.结果 30例下颌角截骨术后下颌神经管骨壁均完整,未损伤下颌骨体内神经血管柬.结论 三维CT可以准确定位下颌神经管,指导下颌角截骨整形术的截骨设计与术中操作,减少下齿槽神经血管束损伤的几率.

Significance of location of mandibular canal by 3-dimensional CT in the mandibular angle osteotomy

Objective To decrease the incidence of inferior alveolar neurovascular bundle injury through location of mandibular canal by 3-dimensional(3-D) CT.Methods 30 female cases with prominent mandibular angle underwent 3-D CT before operation.The 3-D images were used to measure the distances between upper points of lower teeth to the inferior border of the canal.Then the esteotomy was designed according to the canal position to avoid the inferior alveolar neurovascular bundle injury.The canal protection was observed intraoperatively and postoperatively.Results The mandibular canal was protected very well in all 30 cases without any injury to the inferior alveolar neurovascular bundle.Conclusions The 3-D CT can accurately locate the mandibular canal to guide the design of the mandibular angle osteotomy for patients with prominent mandibular angle.