【摘要】 目的:利用锥形束CT(cone beam computed tomography,CBCT)成像技术,研究下颌神经管的结构、位置及分支。方法:收集160例正常人群的CBCT下颌骨扫描数据,观测下颌神经管在下颌体的位置、下颌神经管在下颌第三磨牙至颏孔之间的分支情况、与下颌后牙的三维位置关系。结果:下颌神经管从第三磨牙到第二前磨牙的直径平均为2.98 mm。9.38%的下颌神经管出现前襻,平均深度在12.86 mm以下。7.5%的第三磨牙与下颌管接触。下颌神经管中分支率为28.44%。结论:CBCT影像有助于确定下颌管的结构、位置及分支,可避免或减少治疗中的下颌神经受损。更多还原

【Abstract】 Objective: To study the structure,position and bifid of the mandibular canal by CBCT image. Methods: CBCT data of160 people were collected,and mandibular canal position in mandible,bifid from third molar to mental foramen,and three dimensional relation with the posterior teeth were analyzed. Results: The average diameter of mandibular canal was 2.98 mm from third molar to second premolar. Anterior loop appeared in 9.38% of the mandibular canals,and the average depth is 12.86 mm. Mandibular canal contacted with 7.5% of the third molars,and the rate is higher when canal located lingually to the third molar. 28.44% of the mandibular canals have bifids. Conclusions: CBCT image can help to observe the structure,position and bifid of the mandibular canal,and avoid or reduce the nerve damage in treatment.更多还原