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目的 通过锥形束计算机成像(Cone beam computed tomography,CBCT)对成人低角型骨性Ⅱ类错(牙合)上前牙区牙槽骨形态结构进行分析,探讨其与切牙唇倾度之间的相关性,为正畸临床诊疗提供参考.方法 选取60例成人低角型骨性Ⅱ类错(牙合)患者为实验组,个别正常(牙合)20例为对照组,拍摄CBCT,分别对上前牙区牙槽骨形态特征进行对比分析,并将实验组根据上中切牙唇倾度的不同进行分组整理分析.结果 实验组上前牙区唇腭侧牙槽骨厚度及高度均低于对照组(P＜0.05).切牙唇倾度与上切牙区腭侧根尖牙槽骨厚度和根尖处牙槽骨总厚度呈现负相关,与唇侧牙槽嵴顶与釉牙骨质界距离呈现正相关(P＜0.05).结论 成人低角型骨性Ⅱ类错(牙合)患者上前牙区牙槽骨厚度和高度均低于个别正常(牙合);成人低角型骨性Ⅱ类错(牙合)上切牙区牙槽骨厚度及高度与切牙唇倾度之间存在显著相关性;上尖牙牙槽骨厚度及高度与切牙唇倾度之间无明显相关性.“,”Objective To study the alveolar bone morphology in the maxillary anterior teeth area of the low-angle skeletal Class Ⅱ malocclusion subjects,and to analyze the correlation between morphological features and the incisor labial inclination.Methods 60 adults with low-angle skeletal Class Ⅱ malocclusion (experimental group) and 20 adults with normal occlusion (control group) were included.The maxillary alveolar bone structure of the anterior teeth were observed using CBCT.Then the experimental group were divided according to the upper middle incisor labial inclination and were analyzed.Results The thickness and height of the maxillary anterior alveolar bone in experimental group were lower than those in control group (P＜ 0.05).There was a negative correlation between the thickness of palatal and total apical alveolar bone and the incisor labial inclination.The distance between the labial alveolar ridge crest and cemento-enamel junction (CEJ) had a positive correlation with the incisor labial inclination (P＜0.05).Conclusions The thickness and height of the anterior alveolar bone of low-angle skeletal Class Ⅱ malocclusion were lower than those of the normal teeth.There was a significant correlation between the thickness and height of the alveolar bone in upper incisor area and the incisor labial inclination.There was no significant correlation between the thickness and height of the alveolar bone in upper canine regions and the incisal inclination.