CBCT观察影像重叠的下颌第三磨牙与下颌管的位置关系

目的:观察在曲面断层片(Orthpantomography,OPG)中表现为重叠影像的下颌第三磨牙和下颌管在CBCT(cone beam CT)中的位置关系。方法:对在OPG上表现为下颌第三磨牙和下颌管影像重叠的116名患者(136颗牙)进行CBCT扫描。利用软件(I-view)对所得图像测量分类。通过SAS软件对所得数据进行x~2检验。结果:136颗牙中,在下颌第三磨牙和下颌管接触方面的概率上与性别无关(P=0.0758);而当OPG中下颌管与第三磨牙重叠时,骨白线的存在与否与两者是否接触是有关的(P=0.0003)。结论:下颌CBCT和OPG相比,可以更准确地反映下颌管和下颌第三磨牙的位置关系。

CBCT Orthopantomography in Assessing Topographic Relationship between the Mandibular Canal and Impacted Third Molars

Objective：To observe the position and relationship of mandibular third molar and mandibular canal which show overlapping image on orthopantomography with CBCT.Methods：116 patients with 136 teeth on orthopantomography were assessed with CBCT.Software（I-view） was used to measure and class the image.All statistical analysis was performed using x~2 test by the SAS statistical package.Results：There was no correlation between the sex and the probability of mandibular third molar contacted with mandibular canal（P=0.07580.05）.Correlation：existed between the white bone line and the probability of mandibular third molar contacted with mandibular canal（P=0.00030.05）.Conclusion：CBCT can predict more exactly the position and relationship of mandibular third molar and mandibular canal,compared with OPG.