年轻成人安氏I类错牙合亚型的X线头影测量分析(1)
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[摘要]目的：分析年轻成人安氏Ⅰ类错牙合亚型特征。方法：选取101例安氏Ⅰ类错牙合年轻成年患者，拍摄颅颌定位X线片。用头影测量“优选法”的17项测量指标，按水平方向和垂直方向进行聚类分析，并与正常人群进行比较。结果：测量指标按水平方向可聚类为3个亚类，即水平Ⅰ类、Ⅱ类和Ⅲ类，所占比例分别为17.8%、12.9%和65.3%。水平Ⅰ类特征：上颌略偏缩、下颌后缩，Ⅱ类错牙合趋势，上下中切牙唇倾；水平Ⅱ类特征：上颌前凸、下颌后缩，上下中切牙舌倾，上下唇相对于上下切牙突度大；水平Ⅲ类特征：上颌前凸、下颌后缩，上下中切牙唇倾，上下唇相对于上下切牙突度大。按垂直方向聚为Ⅰ类，特征是垂直方向发育不足，尤其是面下1/3为著，下颌呈后旋趋势，上下唇突。结论：年轻成人安氏I类错牙合水平方向分为3个亚类、垂直方向为Ⅰ类。总体趋势是下颌后缩、面下1/3发育不足，但上颌骨、上下前牙和唇位等方面仍有一定的差异，临床应针对性诊治。
[关键词]安氏I类错牙合；牙颌面特征；头影测量优选法；亚型
[中图分类号]R783.5 [文献标识码]A [文章编号]1008-6455(2012)03-0462-03
Cephalometric analysis of the subdivision characteristic of Angle's ClassⅠmalocclusion in the young adults
CAI Liu-yi1,LIU lin-bo1,DING Yin2
(1.Department of Plastic Surgery,The First Affiliated Hospital,Zhengzhou University,Zhengzhou 450052,Henan,China;2.Department of Orthodontics,Stomatological Hospital,the Fourth Military Medical University)
Abstract: Objective To analyse the subdivision characteristic of Angle's ClassⅠmalocclusion in the young adults. Methods 101 samples with Angle's ClassⅠmalocclusion were selected from university students. X ray cephalometric films were photographed and analysed by "well-selected method" from the measurement software of stomatological hospital,the Fourth Military Medical University.And the seventeen quotas measurement results were accumulated into subdivisions at horizontal and vertical directions and compared with that of the normal occlusion. Results They were accumulated into 3 subdivisions at horizontal direction and 1 subdivision at vertical direction. The percentage of horizontal Ⅰ,Ⅱ and Ⅲ was 17.8%,12.9% and 65.3% accordingly.Compared with the normal occlusion people,horizontalⅠsubdivision showed slightly maxilla retrusion,mandible retrusion,Class Ⅱ malocclusion tendency and more labial inclined upper and lower central incisors.HorizontalⅡsubdivision showed maxilla protrusion,mandible retrusion,more lingual inclined upper and lower central incisors and more protruded lips ......
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