54例正常人双侧颞下颌关节CBCT测量值分析

目的：探讨应用CBCT（cone-beamcomputedtomography）对成年人两侧颞下颌关节进行多项指标数据测量分析。方法：在TMJ成像与测量技术的基础上，筛选出正常成人54例，通过严格的TMJ临床检查确定为健康关节，利用Newtom9000CBCT对其ICP位颞下颌关节进行成像后测量分析。结果：在轴位测得髁状突水平角以及单侧髁状突距矢状中线的距离；平行于髁状突长轴的斜位，测髁状突长轴径，垂直角度，沿髁状突长轴顶内外极间任意角间隙宽度；垂直于髁状突长轴的斜位测量关节髁状突前中后任意角间隙宽度，关节凹深度和前斜面角度关节颈厚度；矢状位测关节髁状突前中后任意角间隙宽度，关节凹深度和前斜面角度关节颈厚度。结论：正常成人双侧髁状突位置及关节窝形态性别差异不明显，双髁状突位置及关节窝形态基本对称。

The measurement technique of skeletal structure of temporomandibular joint with dental volumetric computerized tomography

Objective:To analyze the measurements of bilateral reconstruction of temporomandibular joint(TMJ) by dental cone beam computed tomography(CBCT).Methods:To evaluate the clinical value of this method in healthy adults:54 healthy subjects were selected and scanned by CBCT.Choose the interested region to reconstruct the image of bony structure of TMJ at axial view,coronal position,sagittal position which were commonly used in clinic and oblique position parallelled to the long axis of condyle,oblique position vertical to the long axis of condyle,contour section of condyle which were specially used in this study.Results:54 patients were all acquired satisfactory reconstruction image.The TMJ morphous were clearly demonstrated at oblique position parallelled to the long axis of condyle and oblique position vertical to the long axis of condyle.The section of long axis or minor axis of bilateral condyle were reconstructed in the same image at contour section of condyle,which made the contrast of bilateral condyle convenient.Conclusions:There was no gender difference in terms of condyle positions and shapes.The positions of bilateral condyle were relatively symmetry.