摘要
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 find the distribution of subdivision of class Ⅱ division Ⅰ maloccousion among Chinese children, and their maxilofacial morphologic features accompanied by high and low mandibular angle. Methods: Cephalometric analysis was performed with 100 cases of calss Ⅱ division Ⅰ. According to the modified measures of SNA, SNB and FH-MP, these patients was divided into two groups: high angle and low angle. Detailed study was performed separately for the two groups. Results: Among all these cases, patients with indeed maxillary protrusion accounted for 23%, those with mandibular retrognathia accounted 65%. 45% cases showed discrepancy. The high angle group exhibited forward and downward rotated palatal plane and backward rotated mandibule. The low angle group showed maxillary prognathia and small mandibular angle.Conclusions: The class Ⅱ division Ⅰ patients showed a maxilofacial morphological feature of versatility. Most patients showed mandibular retrognathia, at the same time we should not overlood the impact of the variation of vertical position of the maxillary.
出处
《口腔医学纵横》
CSCD
1999年第3期151-153,共3页
Journal of Comprehensive Stomatology
关键词
错HE
分型
高平面角
低平面角
class Ⅱ division Ⅰ malocclusion srbtype high angle low angle
