论文部分内容阅读
目的：探讨中国儿童安氏Ⅱ１ 错牙合各类型的分布及其高低角错牙合的颅面特征。方法：采用Ｘ线头影测量技术，对１００ 例恒牙初期安氏Ⅱ１ 错牙合进行研究，以修正读数后的ＳＮＡ、ＳＮＢ角和ＦＨ—ＭＰ平面为参照从矢状和垂直方向将上下颌对颅底的变异进行分型统计，并抽出高、低角组进一步测量研究。结果：真性上颌前突只占２３％ ，部分病例上颌后缩，６５％ 的错牙合伴有下颌后缩，４５％ 的存在垂直关系不调；高角组腭平面前部向下倾斜，下颌整体呈后下旋转位，下颌后缩；低角组上颌前突，下颌角缩小。结论：安氏Ⅱ１ 错牙合表现多种类型，以下颌后缩多见，同时不可忽视上颌垂直向变异对其产生的影响。
Objective: To investigate the distribution of various types of malocclusion in children with Angle Ⅱ1 malocclusion in Chinese children. Methods: The clinical data of 100 cases of early malocclusion of Angle Ⅱ1 malocclusion were studied by X-ray cephalometric technique. The sagittal and vertical planes were taken as the references to correct the maxillary and mandibular pairs Stroke variation of the skull base type statistics, and extracted high and low angle group for further measurement studies. Results: True maxillary protrusion only accounted for 23%. In some cases, maxillary retraction, 65% of the malocclusion accompanied by mandibular retrusion, 45% of the existence of vertical relationship does not transfer; high angle group palatal front tilt downward, the whole mandibular After the next spin bit, mandibular retraction; low angle group maxillary protrusion, mandibular angle narrowing. Conclusion: There are many types of malocclusion in Angle Ⅱ 1 malocclusion, which are more common in mandibular retrognathism. Meanwhile, the influence of maxilla vertical variation can not be neglected.