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目的:对比分析下颌神经管在CBCT与曲面体层片上可见性的一致性,探讨影响下颌神经管在图像上可见性的非病变因素。方法:选取2013年12月~2014年2月期间在华西口腔医院同时拍摄了CBCT与曲面体层片的患者92例,由2位放射科医师同时观察患者的CBCT片与曲面体层片。把CBCT及曲面体层片上的下颌神经管从颏孔至下颌升支前缘处平分为1、2、3三个区域,分为0、1、2、3四个等级的分对下颌神经管的可见性进行评分。结果:2位医师间的内部一致性检验符合标准。CBCT上,区域1平均得分为2.120,区域2为2.337,区域3为2.533;曲面体层片上,区域1平均得分为1.772,区域2为1.973,区域3为2.207。越往后区域可见性越高。结论:CBCT对下颌神经管的可见性显著高于曲面体层片,仅有1%的下颌神经管在曲面体层片上可见,在CBCT上不可见。下颌神经管的可见性与年龄呈相关性,年龄越大,可见性越低。
OBJECTIVE: To compare and analyze the consistency of mandibular canal on the CBCT and the surface of the curved body slice, and to explore the non-pathological factors that affect the visualization of the mandibular canal. Methods: From December 2013 to February 2014, 92 patients with both CBCT and curved surface slice were selected at Huaxi Stomatological Hospital. Two radiologists simultaneously observed CBCT and curved body slice. The CBCT and the surface of the mandibular canal on the mandibular canal from the mental foramen to mandibular ascending branch at 1, 2, 3 divided into three regions, divided into 0,1,2,3 four levels of submandibular neural tube The visibility of the score. Results: The internal consistency test between two physicians met the standard. On CBCT, the average score of region 1 was 2.120, region 2 was 2.337, and region 3 was 2.533. The mean score of region 1 was 1.772, the region 2 was 1.973 and the region 3 was 2.207 on the surface of the body. Visibility of the more backward area. CONCLUSIONS: The visibility of CBCT to the mandibular canal is significantly higher than that of the curved body lamina. Only 1% of the mandibular canal is visible on the curved body slice and not visible on CBCT. Visibility of the mandibular canal is related to age, the older the lower the visibility.