上颌尖牙阻生及相邻切牙牙根吸收的三维空间研究  

A study of maxillary canine impaction and root resorption of adjacent incisor in three-dimensional space

作　　者：王垚[1] 栗震亚[2] 任卫萍[2] 龙飞[2] 

机构地区：[1]宁夏医科大学口腔医学院,银川750000 [2]甘肃省人民医院口腔诊疗中心

出　　处：《实用口腔医学杂志》2014年第2期198-201,共4页Journal of Practical Stomatology

摘　　要：目的：用锥形束 CT（CBCT）在三维空间中定位阻生尖牙及确定最常见阻生类型，同时评估相邻切牙（中切牙和侧切牙）牙根吸收情况。方法：对63例患者92颗上颌阻生尖牙患者进行 CBCT 扫描，采用多平面重建（MPR）获得三维重建图像。在矢状、冠状、轴切面视图中，设定 X，Y，Z 平面，并对每个阻生尖牙牙尖定位，观察相邻切牙牙根吸收状况。结果：在 X 平面中：92％偏近中阻生，阻生距离10．4～15．1 mm，8％偏远中阻生，阻生距离2～5 mm；在 Z 平面中：60％偏腭侧阻生，阻生距离1～4 mm，40％偏唇侧阻生，阻生距离0～4 mm。相邻切牙牙根41．3％无吸收，36．5％轻微吸收，14．3％中度吸收，7．9％重度吸收。结论：上颌阻生尖牙最常发生于腭侧、近中，多伴有相邻切牙牙根吸收。Objective：To localize the impacted maxillary canine and to observe the root resorption of adjacent incisor in 3 dimen-sions using cone beam computed tomography（CBCT）.Methods：92 impacted maxillary canines in 63 patients were scanned by CBCT.The three-dimensional images were obtained by multiplanar reconstructions（MPR）.The cusp tip of each impacted canine was localized and set to the X,Y and Z planes after the observation of sagittal,coronal and axial views.The root resorption of adjacent in-cisors was observed.Results：In the X-axis,92% of impactions were mesial by 1 0.4 to 1 5.1 mm,8% distal by 2 to 5 mm;in the Z-axis,60% of impactions were palatal by 1 to 4 mm,40% buccal by 0 to 4 mm.41 .3% of the impacted canines were without root resorption of adjacent incisor,36.5% with slight,1 4.3% with moderate and 7.9% with severe root resorption of the adjacent inci-sor.Conclusion：The most frequent location of impacted maxillary canine is palatal and mesial with high incidence of root resorption of adjacent incisor.

关 键 词：锥形束CT 阻生尖牙 牙根吸收 

分 类 号：R783.5[医药卫生—口腔医学]