上颌第三磨牙牙根与上颌窦底关系的锥形束 CT 研究

摘要

选择北京大学口腔医院第二门诊部锥形束 CT 影像库存中2130颗上颌第三磨牙影像资料，依据其不同阻生位置分为3组。分析比较各组第三磨牙与上颌窦底的关系，结果发现在低、中、高位阻生的上颌第三磨牙中，牙根根尖水平高于上颌窦底的出现概率分别为4．5％、10．3％及14．6％。%Cone-bine CT(CBCT)images of 2 130 maxillary third molars were divided into 3 groups according to the impaction position. The relationship between the floor of maxillary sinus and the roots of maxillary third molar was analyzed and compared.In low,median and high impaction groups the probability of the root tip of maxillary third molar higher than the floor of maxillary sinus was 4.5%,10.3% and 14.6% respectively.