替牙期骨性Ⅲ类高角错牙合颞下颌关节CBCT测量分析

CBCT analysis of the temporomandibular joint in skeletal Class Ⅲ with high-angle in mixed dentition

目的应用CBCT测量分析替牙期骨性Ⅲ类高角错牙合颞下颌关节的骨性结构,探讨替牙期骨性Ⅲ类高角错牙合与正常牙合颞下颌关节的形态结构差异。方法选取符合纳入标准的替牙期骨性Ⅲ类高角错牙合与正常牙合患者各20例,在牙尖交错位拍摄CBCT,使用Invivo 5软件进行图像重建,选取所要研究的颞下颌关节区域进行测量分析。结果替牙期骨性Ⅲ类高角组髁突长轴径、关节窝宽度、髁状突长度大于正常组,而髁突前后径、关节窝深度、关节结节后斜面倾斜角和髁状突高度小于正常组(P<0.05)。结论替牙期骨性Ⅲ类高角错牙合颞下颌关节的髁状突和关节窝形态结构与正常牙合不同。

Objects To analyze the skeletal structure of temporomandibular joint in skeletal class Ⅲ with high-angle in mixed dentition by using CBCT. Methods 20 normal occlusion children in mixed dentition and 20 skeletal class Ⅲ children with high-angle in mixed dentition were included in this study. CBCT was performed in the intercuspal position. Relevant parameter from reconstructed images of TMJ were calculated with Invivo 5 software. Results Compared with the normal occlusion group, the condylar mediolateral diameter, fossa width and condylar length were larger while condylar anteroposterior diameter, fossa depth, Tuberculum articulare angle and condylar height were smaller in the skeletal class Ⅲ group in mixed dentition （P〈0.05）. Conclusion There are statistical differences of skeletal structures between normal occlusion group and the skeletal class Ⅲ group in mixed dentition.