中国南北方安氏Ⅱ~1错的颅颌面特征对比分析

The analysis about the craniofacial characteristics of northern and southern Chinese children with classⅡ division 1

目的:研究中国北方地区安氏Ⅱ1错牙合的颅颌面形态特征及从恒牙初期到恒牙期生长变化对其特征的影响,比较其与中国北方地区正常牙合和中国南方地区安氏Ⅱ1错牙合的差异。方法:随机抽取120名黑龙江省安氏Ⅱ1错牙合患者的头颅侧位片,采用Bjǒrk分析法对其进行对比分析。结果:安氏Ⅱ1错牙合从恒牙初期到恒牙期SNB和SNPg明显增加;在颅颌面特征上男女性别无差异;北方地区安氏Ⅱ1错牙合具有上颌正常,下颌后缩,高角的特点。结论:中国南北方安氏Ⅱ1错牙合的颅颌面特征在上颌突度、上下牙弓突度、上颌牙齿倾斜度上有明显的不同。

Objective：To investigate the craniofacial pattern and the craniofacial changes from early permanent dentition to permanent dentition of Northern Chinese children with Class Ⅱ Division 1, and to compare with Chinese population norms and Southern Chinese with Class Ⅱ Division 1. Method： Later cephalometric radiograghs of 120 Patients with Class Ⅱ Division 1 malocclusions were studied by Bjork analysis. Result： SNB and SNPg were increased from early permanent dentition to permanent dentition. There were no significant sex differences. Northern Chinese with Class Ⅱ Division 1 have normal maxillas, more retrusive mandibles and steeper mandibular plane, conclusion： there were the different in prognathic maxillas, the protrution of upper and lower dental arch, and the proclined maxillary incisors between Northern and Southem Chinese children with class Ⅱ division 1.