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目的 :应用锥形束CT(cone-beam computed tomography,CBCT)三维成像测量正常及安氏Ⅱ类1分类和2分类错畸形患者上切牙区牙槽骨形态,分析其三维结构以及与牙根的关系,评价其对正畸计划制订及治疗的影响。方法:选取20例正常患者、20例安氏Ⅱ类1分类和20例安氏Ⅱ类2分类错畸形患者,拍摄治疗前CBCT影像,通过INVIVO 5.0图像处理软件对图像进行三维重建,测量上切牙唇腭侧的牙槽骨厚度。利用SPSS19.0软件包对数据进行配对t检验。结果:除安氏Ⅱ类2分类腭侧根尖牙槽骨厚度与正常相比无显著差异外,其他各组数据之间均有显著差异。结论:正畸治疗中应综合考虑牙位置与牙槽骨形态的相互关系,不可过度依赖牙移动来代偿骨性不调,避免不恰当的牙移动导致牙根吸收、牙槽骨附着降低、骨开窗、骨穿孔等不良反应。
OBJECTIVE: To determine the three-dimensional structure of alveolar bone in normal , Class Ⅱ division 1 and type 2 malocclusion patients by cone-beam computed tomography (CBCT) three-dimensional imaging. Root of the relationship between the evaluation of orthodontic planning and treatment of the impact. Methods: Twenty patients with normal , 20 patients with Class Ⅱ division 1 and 20 cases with Class Ⅱ division Ⅱ malocclusion were enrolled in this study. CBCT images were taken before treatment. The images were reconstructed by INVIVO 5.0 image processing software and measured Upper alveolar bone on the palatal side of the incisor. Data was paired t-test using SPSS19.0 software package. Results: There was a significant difference between the data of other groups except that in Class Ⅱ division 2, there was no significant difference in the thickness of apical alveolar bone between normal group and control group. Conclusion: The orthodontic treatment should take into account the relationship between tooth position and alveolar bone morphology, not over-reliance on tooth movement to compensate for bony irregularities, to avoid inappropriate tooth movement leading to root resorption, alveolar bone attachment decreased, bone Fenestration, bone perforation and other adverse reactions.