下颌神经管结构、位置与分支的CBCT影像研究

The study on the structure,position and bifid of the mandibular canal by CBCT image

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。

Objective： To study the structure, position and bifid of the mandibular canal by CBCT image. Methods： CBCT data of 160 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.