青少年下颌第一恒磨牙牙根及根管的锥形束 CT 研究  

Investigation of root and root canal of mandibular first permanent molars in adolescents by cone-beam computed tomography

作　　者：李明霞[1,2] 王光平[1,3] 杨江华[1,4] 

机构地区：[1]泸州医学院口颌面修复重建和再生实验室 [2]泸州医学院附属口腔医院放射科,646000 [3]泸州医学院附属口腔医院口腔正畸科,646000 [4]泸州医学院附属口腔医院口腔内科,646000

出　　处：《实用口腔医学杂志》2015年第3期397-400,共4页Journal of Practical Stomatology

基　　金：泸州医学院青年基金(编号:2012QN-13);泸州医学院附属口腔医院青年基金项目(编号:2012005)

摘　　要：目的：应用锥形束 CT（CBCT）分析青少年下颌第一恒磨牙牙根及根管形态。方法：收集2012-07～12拍摄 CBCT 的183例12～16岁青少年患者的366颗下颌第一恒磨牙的锥形束 CT 影像资料，记录患者年龄、性别、观察牙位及牙根数目、根管数目及根管形态，利用 SPSS 19．0软件统计分析下颌第一恒磨牙牙根及根管数目的性别差异和左右侧差异。结果：纳入研究的366颗下颌第一恒磨牙中，近中单根者365颗，远中单根者282颗（77.05％），双根者83颗（22.68％），1颗牙为 C 形根。近中单根双根管者356颗（97.27％），单根一根管者9颗（2.46％）；远中单根一根管者229颗（62.57％），单根双根管者53颗（14.48％），双根各一根管者83颗（22.68％）；C 形根3根管者1颗（0.27％）。牙根及根管数目在男女之间与左右侧之间差异均无统计学意义。结论：下颌第一恒磨牙以双根居多，牙根变异主要发生在远中根，远中舌根的发生率较高；性别间与左右侧牙之间无明显差异。Objective：To investigate the root and canal morphology of mandibular first permanent molars in adolescents by cone-beam computered tomography （CBCT）.Methods：366 mandibular first permanent molars in 1 83 adolescents aged 1 2 -1 6 years were examined by CBCT from July,201 2 to December,201 3.The age,sex,the number of roots and canals and canal morphology were re-corded.The data were statistically analyzed by software SPSS 1 9.0.Results：365 mandibular first permanent molars showed single mesial root except one with C-shaped root;282（77.05%）teeth had one distal root,83（22.68%）had two.356（97.27%）teeth had two mesial canals and 9（2.46%）had one.229（62.57%）teeth had one distal root with one canal,53（1 4.48%）had one distal root with two canals.83（22.68%）had two distal roots with one canal in each root,one （0.27%）had C-shaped root with three canals. There were no significant differences between males and females and between the two sides on the number of roots and number of ca-nals.Conclusion：Majority of mandibular first molars have two roots,the root change occurs in distal root.The prevalence of three-rooted mandibular first molars has no significant difference between genders and 2 sides.

关 键 词：下颌第一恒磨牙 牙根 根管 锥形束CT(CBCT) 

分 类 号：R781.05[医药卫生—口腔医学]