成人Angle Ⅱ~2错畸形患者髁突位置及颞下颌关节形态的CBCT观察研究

Anatomy feature of TMJ in adult patients with Class Ⅱ Division 2 malocclusions: Assesment by CBCT

目的:利用锥形束CT(CBCT)评估成人Angle Ⅰ与Angle Ⅱ2错畸形患者颞下颌关节的形态特征及与颞下颌关节窝的关系。方法:通过对30例Angle Ⅰ与30例Angle Ⅱ2类错畸形成人患者行TMJ的CBCT扫描,在GALILEOS工作站分析测量颞下颌关节窝间隙、髁突相关指标,进行统计学分析,比较Angle Ⅰ与Angle Ⅱ2TMJ形态学之间的差异。结果:①Angle Ⅰ、An-gle Ⅱ2类左右两侧髁突在各自颞下颌关节窝内的位置均无明显差异(P>0.05)。②Angle Ⅱ2组颞下颌关节窝深度、前间隙、上间隙均大于Angle Ⅰ组,后间隙小于Angle Ⅰ组(P<0.05)。结论:Angle Ⅰ与Angle Ⅱ2患者两侧髁突在颞下颌关节窝内位置对称,Angle Ⅱ2颞下颌关节窝深度,上间隙及前间隙比Angle Ⅰ大,后间隙比Angle Ⅰ小。

Objective： To compare the anatomy and condyle-fossa relationship difference between adult patients with AngleⅠ maloc- clusion and those with Angle Ⅱ2 malocclusions by 3-dimensional cone-beam volumetric scans（CBCT）. Methods： 30 patients with An- gle Ⅰ malocclusion, and 30 with Angle Ⅱ2 malocclusion underwent CBCT examination. The images of temporomandibular joints obtained from fixed sagittal slices were used to assess the condyle-fossa relationship. The difference between Angle Ⅰand Angle Ⅱ2 patients was analyzed by a paired-samples t-test, and an independent-sample t-test. Results： ①The position of condyle in the TMJ fossa was not significantly different between the 2 groups （P 〉 0.05 ）. ②In AngleⅡ2 samples, the mandibular fossa depth, anterior joint space and the superior joint space were bigger, but the posterior joint space was smaller than those in Angle Ⅰ. Conclusion： The condyles in their mandibular fossae are symmitrical but the joint space is different in the 2 groups.