摘要
目的 探讨替牙期骨性AngleⅢ类错 牙合颌骨间近远中和垂直方向的关系以及错牙合机制。方法 选择38例替牙期骨性AngleⅢ类错 牙合者为实验样本 ,另选 4 0例相应年龄的替牙期正常牙合作对照组。拍摄正中牙合位的X线头颅定位侧位片。结果 硬组织线距测量值男女各 10项两组间有显著性差异。角度测量值 17项有显著性差异。线距比例值 5项有显著性差异。结论 下颌发育过度是形成替牙期骨性Ⅲ类错牙合的主要原因 ,下颌骨形态改变以及髁突前移又进一步加重了上下颌间关系的不协调 ;其中上颌正常下颌前突的高角型病例为最多见的类型 。
Objective To investigate the difference of mesiodistal and vertical intermaxillary relationship between skeletal Class Ⅲ malocclusion and normal occlusion in mixed dentition and to speculate the etiologic factors of malocclusion.Methods Thirty-eight children with skeletal Class Ⅲ malocclusion in mixed dentition were selected as a sample group,other 40 children at similar mean age with normal occlusion were selected as a control group.Each child took the lateral cephalometric radiograph at central occlusion.Results In linear analysis of hard tissues,10 variables of male and female respectively were significantly different between the sample group and the control group.Five variables in the ratio of linear measurement and 17 variables in angular measurement of hard tissues were also found significantly different between the two groups.Conclusion Mandibular hyperplasia may be mainly responsible for Class Ⅲ malocclusion in mixed dentition.Morphologic changes of mandible and the anterior repositioning of condyle make the intermaxillary discrepancy more serious.The craniofacial type with normal maxilla and high angle protrusive mandible is the most common morphology type.A trend of backward displacement and hypoplasia are found in maxilla.
出处
《现代口腔医学杂志》
CAS
CSCD
2003年第6期533-535,共3页
Journal of Modern Stomatology
