153例错畸形患者W角的测量分析研究

153 Cases of Malocclusion in Patients with W Angle Measurement and Analysis

目的:本研究使用一种新的头影测量方法-W角评价上下颌骨矢状向关系,据此分析安氏3种错类型W值。方法:对153例11～20岁患者头颅侧位片进行头影测量分析,按照ANB角、Wits值和β角分为3组,取平均值和标准差,分析男女差异。结果:分析安氏3种错类型患者W角的正常值;3组W值间差异有统计学意义(P<0.05);各组W值在性别上没有显著差异。结论:W角能反映上下颌骨矢状方向不调,具有较好可重复性。

Objective： To introduce a new cephalometric measurement, named the W angle, to assess the sagittal relationship between maxilla and mandible with accuracy and reproducibility. Methods： One hundred and fifty- three pre-treatment cephalometric radiographs of patients between the age of 11 and 20 years were selected. They were again subdivided into Classes Ⅰ, Ⅱ, and Ⅲ groups on the basis of Beta angle, Wits appraisal, and ANB angle. The mean and the SD for the W angle were calculated. Next, the differences between genders were analyzed. Final-ly , using the one-way analysis of variance and the Newman-Keuls test, we compared the data with those three groups. Results： The cephalometric standard values with normal occlusion were established. Moreover, three groups had statistically significant difference （P〈0.05）. There existed no significant differences between genders. Conclusion： The W angle was developed as a new method to evaluate the sagittal jaw relationship more consistently.