成人高角骨性Ⅲ类错颞下颌关节锥体束CT测量分析

CBCT Analysis for the Skeletal Structure of Temporomandibular Joint of Adults in High-angle of Skeletal Malocclusion ClassⅢ

目的:应用锥形束CT(CBCT),分析成人高角骨性Ⅲ类颞下颌关节(TMJ)的骨性结构。方法:分别对30名成人高角骨性Ⅲ类患者和30名成人正常在牙尖交错位进行CBCT扫描,使用Ez3D2009软件对重建影像进行比较分析。结果:Ⅲ类高角组中,双侧TMJ形态无显著统计学差异;与正常组相比,Ⅲ类高角组TMJ骨性结构具有显著的统计学差异(P<0.01)。结论:成人高角骨性Ⅲ类双侧TMJ结构基本对称;Ⅲ类高角组髁突在关节凹中的位置更为靠前;Ⅲ类高角组TMJ的骨性结构与正常组相比有显著不同。

Objective： To analyse the skeletal structure of temporomandibular joint （TMJ） of adults in high-angle of skeletal malocclusion ClassⅢ by using cone beam computed tomography （CBCT）. Methods： Thirty normal oc- clusion adults （60 joints）and thirty adults（60 joints） in high-angle of skeletal malocclusion Class Ⅲ were undergone CBCT in the intereuspal position. Reconstructed images of TMJ were analysed statistically with Ez3D 2009 soft- ware. Results： In the ClassⅢ sample, there was no statistically significant between sides, but statistically signifi- cant difference （P〈0.01） was observed between normal occlusion group and the Class Ill group. Conclusion： The structures of bilateral TMJs are relatively symmetry. There are significantly differences of skeletal structure of TMJ between normal occlusion group and the Class Ⅲ group.