山东正常牙合少年儿童X线头影测量的Downs分析

Cephalometric study by downs analysis in children with normal occlusion in Shandong province

目的:建立山东省正常牙合少年儿童X线头影测量Downs分析法的均值和标准差,并研究其颅、牙合、面结构的性别、地域差异及增龄性变化。方法:按正常牙合标准选择156名山东籍正常牙合少年儿童,拍摄X线头颅定位侧位片,采用Downs分析法进行定点及测量,进行男女间,替牙期与恒牙初期之间的比较。并与哈尔滨和上海地区恒牙初期儿童正常值比较。结果:得到了山东省正常牙合少年儿童Downs分析法的正常值;男性从替牙期到恒牙初期牙合平面倾斜度变缓,女性下颌骨整体有后缩趋势;与哈尔滨人相比,山东人的上颌相对前突;而与上海人相比,上海人的双颌更加前突。结论:用Downs分析法测得的正常值男女间、替牙期与恒牙期之间均存在差别,不同地区人群头影测量值也存在差别。

Objective： To establish the standard values of Downs cephalometric analysis for children with normal occlusion in Shandong province,and to analyze the craniofacial characteristics in different sexes,areas and ages. Method： Lateral cephalograph was taken in 156 children of Han nationality with normal occlusion in Shandong province,and then Downs analysis and statistics were made. The results between sexes, two dentitions and different areas were compared by t- test. Result：The norms with derivation measured with Downs analysis were established. The mandibular plane of males was getting alleviate during development, and the mandible of female was more retracted than that of male. Children in Shandong province had more protruded maxillary than those in Haerbin, and children in Shanghai had even more protruded jaws. Conclusion： Cephalometric norms are different in sexes, areas and dentitions.