不同垂直骨面型安氏Ⅰ类成年患者颞下颌关节形态特征的锥形束CT研究

Cone beam computed tomography analysis of temporomandibular joint morphology in adult Angle's Class Ⅰmalocclusions with different vertical skeletal features

目的使用锥形束CT(CBCT)研究不同垂直骨面型安氏Ⅰ类成年患者颞下颌关节的形态特征。方法将安氏Ⅰ类成年患者分为高角、均角、低角3组,分别接受CBCT扫描,对颞下颌关节的重建影像进行分析测量,并进行统计学分析,比较不同垂直骨面型安氏Ⅰ类成年患者颞下颌关节形态特征。结果不同垂直骨面型安氏Ⅰ类成年患者双侧颞下颌关节形态特征无明显差异(P>0.05)。高角组、均角组、低角组患者的髁突在关节窝中位置变异较大。在髁突高度、髁突角这两个分析项目上,高角组和均角组及低角组患者之间的差异均存在统计学意义(P<0.05)。结论不同垂直骨面型安氏Ⅰ类成年患者双侧颞下颌关节形态结构基本对称。高角组、均角组、低角组患者的关节窝中的髁突位置变异较大。高角组患者相较于其余2组患者,其髁突高度较低,髁突角较大。

Objective This study used cone beam computed tomography（CBCT） to investigate the morphology of temporomandibular joint（TMJ） in adult Angle＇s Class I malocclusion with different vertical skeletal features. Methods Adult patients with Angle＇s Class I malocclusions were divided into three groups： high angle, normal angle, and low angle. The patients underwent CBCT separately. The reconstructed images of TMJ were analyzed statistically by NNT software. Results Statistically significant differences were not observed between two sides of the TMJ in adult Angle＇s Class I malocclusion with different vertical skeletal features（P〉0.05）. No definite position of the condylar processes was observed in the three groups. Statistically significant differences in the height of condylar process and the angle of condylar process were observed between the high angle group and the other groups（P〈0.05）. Conclusion The two sides of TMJ in adult Angle＇s Class I malocclusion with different vertical skeletal features were mainly symmetrical. The condylar processes had no definite position in the three groups. Compared with the other groups, the height of the condylar processes was lower and the angle of the condylar processes was larger in the high angle group.