摘要目的 探讨安氏Ⅱ类1分类错(牙合)正畸治疗前后前牙区牙槽骨高度改变的特征及相关影响因素.方法 选取符合纳入标准的安氏Ⅱ类1分类错(牙合)62例,其中拔牙治疗32例(男11例,女21例,年龄12.63±0.94岁),非拔牙治疗30例(男17例,女13例,年龄12.33±1.24岁),收集患者正畸治疗前后拍摄的锥形束CT(Cone-beam Computed Tomography,CBCT),分别测量治疗前后上下颌前牙唇舌(腭)侧牙槽嵴顶距釉牙骨质界(Cementoenamel Junction,CEJ)距离,计算牙槽骨高度改变量,利用SPSS 20.0软件对测量数据进行统计分析.结果 安氏Ⅱ类1分类错(牙合)拔牙组与非拔牙组正畸治疗后前牙区牙槽骨高度降低牙面数分别达67.31％与66.94％,平均降低量分别为(1.03±2.47) mm与(0.69±4.02) mm.上颌切牙腭侧及下颌前牙舌侧,拔牙组牙槽骨高度降低量均显著高于非拔牙组,差异有统计学意义(P＜0.05),下颌中切牙唇侧,非拔牙组牙槽骨高度降低量高于拔牙组,差异有统计学意义(P＜0.05).结论 安氏Ⅱ类1分类错(牙合)正畸治疗后前牙区牙槽骨高度普遍降低,降低量与牙位、牙齿移动方向以及牙移动幅度等因素密切相关.提示正畸医生应对安氏Ⅱ类1分类错(牙合)患者治疗前不同牙位的牙槽骨状况有准确的了解,并合理设计牙移动方式、方向和幅度,避免不利的牙齿移动导致牙槽骨高度的显著降低从而危害牙周健康.

abstractsObjective To evaluate the change of anterior alveolar bone height in Class Ⅱ division 1 patients after orthodontic treatment.Methods The sample consisted of 62 Class Ⅱ division 1 patients.They were divided into two groups,extraction group (11 males and 21 females,mean age 12.63±0.94 years) and non-extraction group (17 males and 13 females,mean age 12.33 ± 1.24 years).The Cone-beam Computed Tomography (CBCT) images of pre-treatment and post-treatment were collected.The labial and the lingual (palatal) distance from Cementoenamel Junction (CEJ) to alveolar bone crest of the anterior teeth were measured before and after treatment.SPSS 20.0 software package was used for statistical analysis.Results The alveolar bone height loss in extraction group and non-extraction group reached 67.31％ and 66.94％,respectively.The average bone height loss in extraction group and non-extraction group were (1.03 ± 2.47) mm and (0.69-±-4.02) mm,respectively.For the lingual side of the upper incisors and lower anteriors,the average bone height loss in extraction group was much higher than in non-extraction group (P＞0.05).However,for the labial side of the lower anteriors,the average bone height loss in non-extraction group was much higher than extraction group (P＞0.05).Conclusions The anterior alveolar bone height in Class Ⅱ division 1 patients generally decreased after orthodontic treatment.The amount of decrease was closely correlated to tooth position,moving direction and moving range.