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目的 应用锥形束CT(cone beam computed tomography,CBCT)研究成人骨性安氏Ⅱ类1分类错(牙合)畸形切牙区唇侧牙槽骨开窗及骨开裂的发生率及分布情况,为正畸治疗提供一定参考依据.方法 随机选取2013年7月至2015年5月间北京大学口腔医院正畸科进行锥形束CT扫描的2 376例患者中,临床诊断为骨性安氏Ⅱ类1分类错(牙合)畸形的65例成人患者进行上、下颌切牙区唇侧牙槽骨开窗及骨开裂的统计学分析.结果 在样本人群中,骨开窗和骨开裂的发生率分别为75.38％(49/65)和86.15％(56/65).在不同骨开窗类型中,小于等于根长1/3的骨开窗约占骨开窗总数的76.88％.在不同骨开裂类型中,范围在2～4 mm的最多,约占骨开裂总数的77.13％.在样本牙齿中,切牙区唇侧牙槽骨开窗的发生率为30.78％,以左上颌侧切牙最高(7.69％),右上颌侧切牙次之(6.92％),右上颌中切牙最低(1.15％);切牙区唇侧牙槽骨开裂的发生率为36.15％,右下颌中切牙最高(9.62％),左下颌中切牙次之(8.27％),下颌的发生率高于上颌.男性与女性切牙唇侧骨开窗与骨开裂的发生率无显著性差异.结论 骨性Ⅱ类1分类错(牙合)患者中,切牙区唇侧牙槽骨开窗和骨开裂的发生率较高,且多数骨开窗范围小于等于根长1/3,骨开裂在2～4 mm之间.“,”Objective To investigate the incidence and sites of alveolar bone fenestration and dehiscence in incisor region of adult skeletal class Ⅱ division 1 malocclusions with CBCT images,and to guide orthodontic clinical works.Methods 2 376 CBCT images of orthodontic patients in Peking University Hospital of Stomatology from July 2013 to May 2015 were randomly selected.65 of them were Skeletal Class Ⅱ Division 1 malocclusions.Their fenestration and dehiscence incidence in incisor regions were studied and statistically analyzed.Results The incidence of fenestration in incisor region of Skeletal Class Ⅱ Division 1 malocclusions was 30.78％.The most commonly affected tooth was the left upper lateral incisor,while the least was the right upper central incisor.The incidence of dehiscence in incisor region was 36.15％.The most commonly affected tooth was the right lower central incisor (9.62％),followed with the left lower central incisor (8.27％).The incidence of fenestration and dehiscence in the sample was 75.38％ (49/65)and 86.15％ (56/65),respectively.Among the fenestrations,76.88％ limited to the 1/3 root length,while 77.13％ of the dehiscence was within 2-4 mm.No significant difference was found between genders for fenestration and dehiscence in incisor regions.Conclusions Alveolar bone fenestration and dehiscence is a common in skeletal Class Ⅱ Division 1 patients,and most of the fenestration was less than one third of the root length.