Objective:To analyze the correlation between arch width and different vertical facial skeletal types of the adults with individual normal occlusion.Methods:52 adults with individual normal occlusions(females 31,males 21) were included.According to the values of mandibular plane angle MP-FH,SN-MP measured on CBCT image the subjects were divided into 3 groups(13 cases with highangle,19 with average-angle and 20 with low-angle groups).12 parameters were measured for each sample,including maxillary and mandible arch width and alveolar arch width between canines,between first premolars and between first molars,the difference between the maxillary arch width and mandibular arch width were calculated.The data were statistically analyzed by one-way ANOVA and Pearson~ rank correlation test.Results:In the group of high-angle,average-angle and low-angle the alveolar arch width(mm) between maxillary canines was 38.03 ± 1.90,39.65 ± 1.80 and 39.78 ± 2.20 respectively(P ＜ 0.05).The arch width between maxillary first premolars of high-angle group(37.01 ± 1.60) was smaller than that of low-angle group(38.65 ± 1.30).The arch width difference in canine area between maxillary and mandibular alveolar in high-angle,average-angle and low-angle groups was 7.39 ± 1.82,9.04 ± 1.43 and 9.26 ± 1.67 respectively(P ＜0.05);in maxillary first premolars area in high-angle(6.8 ± 1.59) was smaller than that in averageangle(7.79 ± 1.09),maxillary and mandibular arch width showed no statistical difference.Pearson correlation test showed that among 3 groups,upper and lower alveolar arch width difference in canine and first premolars area was negatively correlated with the mandibular plane angle.while upper and lower arch width difference showed no statistical correlation with the mandibular plane angle.Conclusion:The maxillary middle arch width of the subjects with individual normal occlusion was correlated with vertical facial type.%目的:研究成人个别正常(袷)不同垂直骨面型与牙弓宽度间的相关性.方法:收集成年人个别正常(袷)52例(女31例,男21例).拍摄CBCT片,以下颌平面角(MP-FH,SN-MP)的高度分成高(n=13)、均(n=19)、低(n=20)角3组,测量上下颌尖牙、第一前磨牙、第一磨牙间牙弓及牙槽弓宽度,计算同一样本上下颌对应宽度之差,检验3组测量数据的正态性及方差齐性,做3组间单因素ANOVA及与下颌平面角的Pearson相关检验.结果:高角组、均角组、低角组上颌尖牙间牙槽弓宽度(mm)分别为38.03±1.90、39.65±1.80、39.78±2.20(P ＜0.05),高角组上颌第一前磨牙间牙弓宽度(37.01 ±1.60) mm小于低角组(38.65±1.30) mm.上下颌牙槽弓宽度差值(mm)在尖牙处高角组、均角组、低角组分别为7.39±1.82、9.04±1.43、9.26±1.67(P ＜0.05),在第一前磨牙处高角组(6.8±1.59) mm小于均角组(7.79±1.09) mm;上下颌牙弓宽度差值3组均无统计学差异.Pearson检验显示:上颌尖牙间牙槽弓宽度、第一前磨牙间牙弓和牙槽弓宽度与下颌平面角呈负相关;同时,上下颌牙槽弓宽度差值在尖牙、第一前磨处与下颌平面角呈负相关,上下颌牙弓宽度差值均与下颌平面角无相关性.结论:成人个别正常(袷)上颌前中段牙弓宽度与垂直骨面型有关.
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