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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 ,而上颌则表现出向后移位和发育不足的趋势
Objective To investigate the relationship between orthognal orthognal skeletal Class III malocclusion and orthodontic skeletal malocclusion in malondial phase and the mechanism of malocclusion. Methods 38 cases of skeletal Angle Ⅲ skeletal malocclusion were selected as experimental samples and 40 cases of normal dentition matched control group of the same age were selected. Shooting a median position of the X-ray skull positioning lateral radiographs. Results There was a significant difference between the two groups for the measured values of hard tissue lineage in 10 men and women. There are significant differences between the 17 measurements. Line spacing ratio of 5 items have significant differences. Conclusion The over-development of the mandible is the main reason for the formation of stage Ⅲ malocclusion. The changes of the mandible and the condyle advance further aggravate the incompatibility between the maxilla and the mandible. Among them, The most common types of cases, while the upper jaw showed a backward shift and underdevelopment trend