下颌第一恒磨牙根尖形态的显微CT研究  

Investigation on Apical Morphology of Mandibular First Molar Using Micro-computed Tomography

作　　者：闵艺[1] 何淼[1] 卢冠凡 

机构地区：[1]武汉大学口腔医学院牙体牙髓病科,湖北武汉430079 [2]青岛市口腔医院,山东青岛260000

出　　处：《口腔医学研究》2016年第9期937-940,共4页Journal of Oral Science Research

基　　金：国家自然科学基金(编号:81300870)

摘　　要：目的:使用显微CT研究下颌第一恒磨牙根尖5mm形态。方法:采用显微CT对152颗离体下颌第一恒磨牙进行扫描,利用3-D软件三维重建根尖5mm形态。记录根尖孔和侧副孔数目、峡区发生和分型。结果:94.08%下颌第一恒磨牙有两个单独牙根,61.84%有3个根管。60.91%的近中根有两个根尖孔。37.27%的近中根和33.01%的远中根有侧副孔。73.68%的牙出现峡区,峡区形态以IV型最为常见。结论:下颌第一磨牙根尖形态复杂,常规根管治疗和根尖手术应考虑其复杂性。Objective：To investigate the apical morphology of the mandibular first molar in Chinese population using micro-computed tomographic technique.Methods：A total of 152 mandibular first molars were scanned by micro-competed tomography with the resolution of 30μm.The 3-dimensional（3D）images of all specimens in apical5 mm of the roots were reconstructed.The numbers of roots and root canal,the numbers of apical foramina and lateral/accessory foramina,the prevalence and types of isthmus were recorded.Results：The incidence of two separated roots of the first molars was 94.08%.The incidence of three separated roots was 61.84%.The percentage of two apical foramina in the mesial roots was 60.91%.The percentage of lateral/accessory foramina was 37.27%in the mesial roots and was 33.01%in the distal roots.The incidence of root canal isthmus was 73.68%.Type IV in isthmuses was the most common configurations.Conclusion：The apical canal configuration of mandibular first molars was complicated and should be taken into account during nonsurgical and surgical endodontic procedures.

关 键 词：显微 CT 下颌第一磨牙 峡区 根尖形态 

分 类 号：R781.05[医药卫生—口腔医学]