Objective Using three-dimensional CBCT to evaluate dehiscence and fenestration of the incisor alveolar bone after the incisor retraction in adult patients with bimaxillary protrusion. Methods Twenty adult patients (six males, fourteen females, mean age: 22.8±3.0) with Class1 bimaxillary protrusion were selected from January 1, 2013 to December 31, 2015.These patients extracted four first premolars used Micro- Implant anchorage to strengthened anchorage. The CBCT were taken before and after orthodontic treatment. Alveolar bone dehiscence and fenestration were observed and analyzed statistically . All statistical analyses were performed using SPSS23.0 statistical analysis software, using the χ2 test to compare the rate of alveolar bone fenestration and dehiscence before and after orthodontic treatment. Results A total of 80 teeth were found in the maxillary incisors, there were 18 teeth fenestration before treatment and 26 teeth fenestration after treatment, but do not have statistical significance. A total of 80 teeth were found in the mandibular incisor, there were 8 teeth fenestration before treatment and 15 teeth fenestration after treatment, but do not have statistical significance, there was no statistical significance in the fenestration rate of the incisor before and after the treatment(P>0.05). A total of 80 teeth were found in the maxillary incisors, there were 3 teeth dehiscence before treatment and 6 teeth dehiscence after treatment. There was no statistical significance in the dehiscence rate of the maxillary incisor before and after treatment(P>0.05). A total of 80 teeth were found in the in the mandibular incisor, there were 10 teeth dehiscence before treatment and 21 teeth dehiscence after treatment, There was statistical significance in the dehiscence rate of the mandibular incisor before and after treatment(P<0.05). Conclusion After using Micro-Implant in adult patients with Class1 bimaxillary protrusion, there was no significant change in the alveolar bone fenestration of the incisors , the rate of alveolar bone dehiscence increased in the mandibular incisor . It is suggested that orthodontist should pay close attention to the alveolar bone of the mandibular incisors.%目的:利用三维CBCT评价成人双颌前突患者辅助种植支抗内收后切牙牙槽骨骨开窗率和骨开裂率的变化.方法:选取笔者科室2013年1月-2015年12月成人安氏Ⅰ类双颌前突需要减数4颗第一前磨牙、使用种植支抗内收的患者20例,其中男6例,女14例,平均年龄(22.8±3.0)岁.正畸治疗前后拍摄CBCT,观察切牙牙槽骨骨开裂、骨开窗情况,并进行统计学分析.结果:上颌切牙区共80颗牙,治疗前有18颗开窗,治疗后有26颗开窗,但无统计学意义;下颌切牙区共80颗牙,治疗前有8颗开窗,治疗后有15颗开窗,但无统计学意义.切牙区的牙槽骨开窗率比较,差异无统计学意义(P>0.05);上颌切牙区总共80颗牙,治疗前有3颗开裂,治疗后6颗开裂,上切牙区的牙槽骨开裂率卡方检验比较,差异无统计学意义(P>0.05);下颌切牙区总共80颗牙,治疗前10颗开裂,治疗后21颗开裂,下切牙区的牙槽骨开裂率比较有统计学意义(P<0.05).结论:成人安氏Ⅰ类双颌前突患者辅助种植支抗内收后,切牙牙槽骨骨开窗无显著性变化,下切牙区牙槽骨骨开裂率有加重.提示口腔正畸医生应对下切牙的牙槽骨状况做密切关注.
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