不同年龄下颌第一前磨牙单根管锥度的显微CT研究李向杰1，刘娜1.doc

不同年龄下颌第一前磨牙单根管锥度的显微CT研究 李向杰1，刘　娜1,朱立强2,周　霞1,刘　宁1，叶丽君1,邓蔓菁1 * (1.第三军医大学大坪医院野战外科研究所口腔科, 重庆400042；2. 第三军医大学卫生统计学教研室, 重庆400038) [摘要] 目的：运用显微计算机断层扫描（Micro-CT，M-CT）三维重建后研究不同年龄组下颌第一前磨牙单根管初始锥度。方法：随机选取牙根完整,未进行过牙髓治疗的单根管离体下颌第一前磨牙58颗，按年龄分三组，包括13～25岁、26～45岁和46～60岁，采用Micro-CT扫描重建。再将每颗牙根平均分为三段，包括根颈、根中和根尖三段，通过Mimics 10.01软件测量根管的近远中向及颊舌向管径，分别计算根管三段近远中向和颊舌向根管锥度。结果：颊舌向三段根管锥度的13～25岁年龄组与26～45岁有显著性差异，13～25岁年龄组与46～60岁有显著性差异（P0.05），而26～45岁与46～60岁三段锥度只有根中段有差异（P0.05）； 近远中向三段锥度的13～25岁年龄组与46～60岁的均有显著性差异（P0.05），而26～45岁与46～60岁仅根颈段有显著性差异（P0.05），13～25岁与26～45岁只有根尖段有显著性差异（P0.05）。结论：单根管下颌第一前磨牙中，不同年龄组有着不同的根管原始锥度;临床上根管预备器械的选择应引起重视。 [关键词]下颌第一前磨牙；根管；锥度； 显微CT A comparative study on taper of single root canal of mandibular first premolar in different age by using micro-computed tomography in vitro Li Xiangjie1,Liu Na1,Zhu Liqiang2 ,Zhou Xia1, Liu Ning1, Ye Lijun1, Deng Manjing 1 * （1.Department of Stomatology, Institute of Surgery Research, Daping hospital, Third Military Medical University, Chongqing 400042，China; 2. Department of health statistics of the third military medical university 作者简介：李向杰（1978-），男，四川人，主治医师，硕士研究生，电话邮箱：lixjxiangjie@163.com *通讯作者：邓蔓菁（电话：023传真：023 e-mail:iradeng@163.com） [Abstract] Objective: To determine the initial taper of single root canal mandibular first premolar of different age groups by using Micro-CT. Methods: Fifty eight untreated human single root canal mandibular first premolars with complete dental root and apex were randomly selected. The teeth were scanned by Micro-CT and divided into three groups according to age, including 13 to 25 age group and 26 to 45 age group and 46 to 60 age group. The root of each tooth were divided into three sections of cervical, middle and apical third of the canals, then diameters of the each section in buccolingual and mesiodistal direction were measured using Mimics 10.01 software. The physical canal tapers were calculated and analyzed. Results: In buccolingual direction, significant dif