成人AngleⅠ、AngleⅡ^1和AngleⅡ^2类错[牙合]畸形髁突形态和位置的CBCT对比研究

Comparison of Condylar Morphology and Position between Angle Class Ⅰ and Class Ⅱ Malocclusion in Adults

目的:应用CBCT对无主观关节症状的成人AngleⅠ类、AngleⅡ~1类和AngleⅡ~2类错牙合畸形患者的髁突形态位置进行对比观察研究。方法:选择AngleⅠ类、AngleⅡ~1类和AngleⅡ~2类错牙合畸形患者各19例行CBCT扫描,应用CBCT专用软件Invivo 5.0分析测量颞下颌关节前间隙、上间隙、后间隙、颞下颌关节窝的深度、髁突最大近远中径和最大内外径等相关参数,并运用SPSS 21.0软件包对3组数据进行统计学分析,比较AngleⅠ类、AngleⅡ~1类和AngleⅡ~2类错牙合畸形患者的髁突形态位置差异。结果:AJS(mm)在AngleⅠ类组与AngleⅡ~1类组间和AngleⅠ类组与AngleⅡ~2类组间差异有统计学意义;PJS(mm)在3组中两两组间差异均有统计学意义;DMF(mm)在AngleⅠ类组与AngleⅡ~1类组间和AngleⅠ类组与AngleⅡ~2类组间差异均有统计学意义;MD(mm)在AngleⅠ类组与AngleⅡ~1类组间差异有统计学意义。髁突在关节窝的位置AngleⅠ类组主要表现居中位,占50%;AngleⅡ~1类组和AngleⅡ~2类组主要表现为髁突后移位,分别占55%、84%。结论:AngleⅡ~1类和AngleⅡ~2类错牙合畸形的颞下颌关节前间隙大于AngleⅠ类;AngleⅡ~2类错牙合畸形的颞下颌关节后间隙小于AngleⅡ~1类,AngleⅡ~1类错牙合畸形的颞下颌关节后间隙小于AngleⅠ类;AngleⅡ类错牙合畸形的颞下颌关节后移位。

Objective：To analyze and compare the difference of condylar morphology and position between Angle ClassⅠ and ClassⅡ malocclusion patients using cone-beam CT（CBCT）.Methods：Nineteen ClassⅠ adults,19 Class Ⅱ division 1 adults and 19 Class Ⅱ division 2 adults were selected in this study.Each patient underwent CBCT.The images in the oblique position perpendicular to the condyloid process were reconstructed by Invivo 5.0（through Exam Vision software）.The condylar morphology and position were measured by Invivio 5.0.The data were processed with SPSS 21.0 software package.Results：There were significant differences in the anterior joint space,in the posterior joint space,and in the depth of glenoid fossa among different malocclusion patients.The length of condyle were significant different between Class Ⅰ and ClassⅡ division 1.Fifty percent of the condylloid process in ClassⅠ was in the middle place.Fifty-five percent in ClassⅡ division 1 and 84% in ClassⅡ division 2 of the condylloid were in the posterior space.Conclusion：The anterior joint space is larger in ClassⅡthan ClassⅠ.The posterior joint space is the lowest in ClassⅡ division 2 among three malocclusions.The condylloid is in the posterior space in ClassⅡ.