汉族成人正常和不同错畸形个体W角均值的分析研究

The measurement of W angle in the subjects with normal occlusion and in those with malocclusion of Han nationality

目的:测量汉族成人正常个体W角的正常值,并分析W角在安氏Ⅰ、Ⅱ、Ⅲ类不同矢状向错畸形个体中的分布情况。方法:选择汉族个别正常成人120名(男、女各60名),以及安氏Ⅰ、Ⅱ、Ⅲ类错畸形患者180名(Ⅰ、Ⅱ、Ⅲ类中男女各30名)拍摄头颅定位侧位片,测量W角的均值,并分析不同矢状骨性错畸形个体间W角的差异性。结果:汉族成人正常W角(°)均值男女分别为59.94±4.21、58.03±2.90(P>0.05)。安氏Ⅰ、Ⅱ、Ⅲ类错畸形患者的W角(°)均值分别为58.07±2.96、55.12±3.48和64.85±4.84(P<0.05)。结论:W角的均值可用于评价上下颌骨的矢状向位置关系,安氏Ⅰ类为56.46°≤W角≤61.28°,安氏Ⅱ类为W角<56.46°,安氏Ⅲ类为W角>61.28°。

AIM： To analyze the distribution range of W angle in normal adults and in those with different sagittal malocclusion of Han nationality.METHODS： W angle was measured on lateral cephalometric X-ray films of 120 subjects with normal occlusion（ 60 male and female） and 180 with Class Ⅰ,Ⅱ and Ⅲ malocclusion respectively（ n = 30）,the difference of W angle value of the sujects with different sagittal malocclusion was nalyzed.RESULTS：The mean value of the W angle（ °） in Han male and female adults with normal occlusion was 59.94 ± 4.21 and 58.03 ± 2.90 respectively（ P〈0.05）.The mean value for the W angle in the subjects with Class Ⅰ,Ⅱ and Ⅲ malocclusion was 58.07 ± 2.96,55.12 ± 3.48 and 64.85 ± 4.84 respectively（ P〈0.05）.CONCLUSION： The normal value of W angle can be used to evaluate the relationship between anterior-posterior direction of maxilla and mandible.Skeletal class I malocclusion： 56.46°≤W≤61.28°; Skeletal class Ⅱ malocclusion： W 56.46°; Skeletal class Ⅲ malocclusion： W 〉61.28°.