锥形束CT对Beagle犬减阻-牵张快速牙移动的评价  

Evaluation of rapid teeth movement through reducing resistance and distraction in Beagle dogs with cone-beam computed tomography

作　　者：陈曦[1] 李宁[1] 刘建林 彭早霞[1] 黄亚莉[1] 徐然[1] 刘会婷[3] 杨乐乐[1] 

机构地区：[1]西安交通大学医学院第一附属医院口腔科,陕西西安710061 [2]深圳市第二中医院口腔科,广东深圳518034 [3]西安交通大学医学院第一附属医院教学部,陕西西安710061

出　　处：《南方医科大学学报》2013年第9期1280-1284,共5页Journal of Southern Medical University

基　　金：国家自然科学基金(81070863);陕西省科技攻关项目[2010;k15-04(4)];西安交通大学交叉学科(XJJ20100197)~~

摘　　要：目的应用口腔锥形束CT(cone-beam computed tomography,CBCT)对减阻牵张快速牙移动的效果进行分析、评价。方法Beagle犬10只,雌、雄各半,在下颌左右随机选取一侧为对照侧(常规加力侧,力值约85 g),另一侧为实验侧(减阻-牵张侧)。分别于加力5、10、15 d及加力15 d保持固定10 d、90 d时拍摄CBCT影像。利用CBCT影像及Ez3D2009图形分析软件观察移动牙移动距离、倾斜程度、压力侧牙槽骨密度和牙根吸收情况。结果(1)采用CBCT测量牙齿移动距离结果与直接口内牙齿移动距离测量结果无显著差异(P>0.05);(2)实验侧移动牙发生倾斜程度略大于对照侧(P<0.05);(3)实验侧移动牙牙根未发生广泛吸收,其压力侧牙槽骨密度伴随牙齿移动呈逐渐增高趋势,且新生骨密度、影像学特征与对照侧牙槽骨无显著差异。结论CBCT三维成像技术能够弥补二维影像重叠、变形等不足,尤其在减阻牵张过程中牙齿倾斜度、牙槽骨密度测量方面更具优势,具有无创性及可重复性。Objective To evaluate the effect of rapid teeth movement through reducing resistance and distraction using cone-beam computed tomography （CBCT）. Methods The left or right side of the mandible of 10 beagles （5 males and 5 females） was randomly selected as the control side （for the conventional distraction with a force of about 85 g） and the other side as the experimental side （subjected to reducing resistance and distraction）. CBCT images were taken at 5, 10, and 15 days and also after retaining for 10 and 90 days after distraction for 15 days. The distance of teeth transportation, degree of inclination, alveolar bone density of the compressive area and root resorption were evaluated based on the CBCT images and Ez3D2009 visualization software. Results No significant difference was found between CBCT-based measurement and direct measurement of teeth transportation distance within the mouths （P〉0.05）. Teeth inclination on the experimental side was slightly greater than that on the control side （P〈0.05）. The root resorption on the experimental side was minimal, and the bone density increased gradually along with the teeth migration. The experimental side showed a comparable newly formed alveolar bone density and similar X-ray features of the compressive area with the control side. Conclusions CBCT three-dimensional imaging can resolve the problems of overlapping and deformation of the two-dimensional images and is especially useful for measurement of teeth inclination and alveolar bone density in the process of reducing resistance and distraction.

关 键 词：口腔锥形束CT 牙齿快速移动 牙槽骨密度 

分 类 号：R783.5[医药卫生—口腔医学]