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 ClassⅠ,ⅡandⅢmalocclusion 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 ClassⅠ,ⅡandⅢmal-occlusion 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 mandi-ble. Skeletal class I malocclusion:56. 46°≤W≤61. 28°;Skeletal classⅡmalocclusion:W<56. 46°;Skeletal classⅢ malocclusion:W>61. 28°.%目的:测量汉族成人正常牙合个体W角的正常值,并分析W角在安氏Ⅰ、Ⅱ、Ⅲ类不同矢状向错牙合畸形个体中的分布情况.方法:选择汉族个别正常牙合成人120名(男、女各60名),以及安氏Ⅰ、Ⅱ、Ⅲ类错牙合畸形患者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牙合畸形个体间W角的差异性.结果:汉族成人正常牙合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类错牙合畸形患者的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°.
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