牙科三维CT在埋伏阻生牙助萌中的应用  

Application of 3DX-CT in treating wholly impacted and unerupted teeth

作　　者：唐小山[1] 汪饶饶[1] 房莉[1] 徐远志[1] 

机构地区：[1]同济大学附属第十人民医院口腔科,上海200072

出　　处：《同济大学学报（医学版）》2008年第6期124-127,共4页Journal of Tongji University(Medical Science)

摘　　要：目的探讨牙科三维CT扫描在埋伏牙诊断与助萌中的应用价值。方法对经曲面断层片筛选出的18例19枚埋伏牙进行牙科三维CT检查,扫描层厚1.0 mm,重建后进行图像三维断面显示(包括水平位,矢状位,冠状位),对牙位图像进行分析及测量(包括埋伏牙牙长轴的角度,牙根弯曲度,牙冠的最大径,与骨皮质的距离,与邻牙根、神经孔/管的距离;骨质的厚度、高度等)。对埋伏牙进行正畸或正畸-外科联合助萌。结果牙科三维CT能清晰显示埋伏牙的形态、大小、位置、长轴角度、与邻牙的结构关系等。19枚埋伏牙依据牙科三维CT扫描提供的影像学信息制定不同的治疗计划,均取得了预期的临床效果。结论牙科三维CT扫描可以完整地显示埋伏牙的位置,形态以及进行角度、长度等的测量,有利于助萌方案的设计与实施。Objective To discuss the application of 3DX-CT in the therapy of the bone impacted and unerupted teeth. Methods Nineteen bone impacted and unerupted teeth in 18 cases selected by orthopantomograph were scanned by 3DX-CT with 1.0 mm slice thickness. Images obtained by 3DX-CT （horizontally, sagittally, coronally ） were analyzed after multi-plane reconstruction and 3D reconstruction including the angle of the bone axis impacted and unerupted teeth; maximum radius of the coronal teeth; distances between the tooth and the cortical bone around; distances to the neighboring tooth roots and nerve forum canal; the thickness of the bone tissue, etc. Orthodontic and surgical methods were taken to treat the wholly impacted and unerupted teeth. Results The accurate position of bone impacted and unerupted teeth in the complex maxilla or mandible anatomy structure were clearly reflected by 3DX-CT scan and 3D reconstruction. Nineteen impacted and unerupted teeth got anticipate effects by formulating different treatments according to 3DX-CT imaging data. Conclusion The accurate position of wholly impacted and unerupted teeth in bone can be demonstrated clearly by 3DX-CT. It might play an important role in the diagnosis and treatment of wholly impacted and unerupted teeth.

关 键 词：埋伏牙 牙科三维CT 助萌 

分 类 号：R81[医药卫生—放射医学]