Kerr W J, Miller S, Ayme B, Wilhelm N
Department of Orthodontics, University of Glasgow, Scotland, United Kingdom.
Am J Orthod Dentofacial Orthop. 1994 Aug;106(2):115-20. doi: 10.1016/S0889-5406(94)70027-3.
It is unclear whether malocclusion characterized by jaw discrepancy is caused by variations in mandibular position, mandibular size, or a combination of the two. To clarify the situation, the mandibular outlines of 124 10-year-old boys, equally divided among the Angle classes, were generated from cephalograms with a computer plotting technique. The mean plots for each of the groups were superimposed on S-N and Go-Gn. These showed mandibular form and size to be similar in the Class I and Class III groups and in both divisions of Class II. The position of Class III mandibles was more anterior and rotated forward in relation to the cranial base compared with the other groups. Statistical analysis confirmed these findings. There was evidence to support the idea that Class II, Division 2 malocclusion is largely a dentoalveolar rather than a skeletal entity.
以颌骨差异为特征的错牙合畸形是由下颌位置的变化、下颌大小的变化还是两者的组合引起的尚不清楚。为了澄清这种情况，使用计算机绘图技术从头颅侧位片中生成了124名10岁男孩的下颌轮廓，这些男孩在安氏分类中平均分配。将每组的平均图叠加在S-N和Go-Gn上。结果显示，安氏I类和III类组以及安氏II类的两个亚类的下颌形态和大小相似。与其他组相比，安氏III类下颌骨的位置更靠前，并且相对于颅底向前旋转。统计分析证实了这些发现。有证据支持这样的观点，即安氏II类2分类错牙合畸形在很大程度上是牙牙槽性而非骨性的。
