Objective:To investigate the structure of alveolar bone around incisors in patients with verical facial type of skeletal ClassⅡ by CBCT.Methods:60 skeletal Class Ⅱ patients were divided into low angle,average angle and high angle cases(n =20)by FMA.CBCT scanning was made and the thickness of the labial and lingual alveolar bone around the incisors in each subject was meas-ured.The measurements were analyzed using ANOVA.Results:The total width of alveolar bone at the root apical level of maxillary and mandibular incisors,the lingual thickness of alveolar bone at the root midpoint of maxillary incisors and labial thickness of alveolar bone at the root midpoint of mandibular incisors in the high angle cases were thinner than that in the average and low angle cases(P <0.05),but there was no significant difference in labial thickness of alveolar bone at the crest among 3 groups.Conclusion:The alveo-lar bone thickness around incisors of high angle patients is thinner,more attention should be paid for the alveolar bone absorpation and tooth root exposure in these patients.%目的：运用锥形束计算机断层扫描技术（CBCT）研究骨性Ⅱ类不同垂直骨面型患者切牙牙槽骨形态及厚度。方法：选择未治疗骨性Ⅱ类患者60例，根据 FMA 角分为低角、均角及高角患者各20例。用 CBCT 获得三维影像数据，分析切牙唇、舌侧牙槽骨厚度。采用方差分析比较实验数据。结果：高角患者上下颌切牙根尖区牙槽骨总厚度、上颌切牙腭侧根尖区及下颌切牙唇侧根尖区牙槽骨厚度均小于均角与低角患者（P ＜0．05）；下颌切牙唇侧牙槽嵴顶厚度3组间无差异（P ＞0．05）。结论：骨性Ⅱ类高角患者上下切牙区牙槽骨较为狭窄，需警惕牙槽骨吸收和牙根暴露。
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