CBCT在不同根管内容物情况下对根管壁厚度测量的研究  

The study of measurements of the root canal wall thickness by CBCT in different root canal contents

作　　者：梁向阳[1] 陈树珍[2] 李春年[1] 代鑫鹏 孔晶晶[1] 张扬[1] 

机构地区：[1]河北医科大学口腔医院.河北省口腔医学重点实验室,石家庄050017 [2]河北省胸科医院

出　　处：《现代口腔医学杂志》2018年第1期16-19,共4页Journal of Modern Stomatology

基　　金：河北省省级科技计划项目(16277710D)

摘　　要：目的通过应用CBCT检测根管内容物分别为根充糊剂热牙胶、纤维桩、纯钛桩的情况下根管壁的厚度,为临床上精准应用CBCT提供参考。方法选择因正畸拔除的新鲜离体牙,沿釉牙骨质界处截断,分为正常根管组、根管预备组、根管充填组、纤维桩组、纯钛桩组,每组10颗离体牙,分别对应对根管不处理、常规镍钛根管器械预备根管、根管预备后糊剂热牙胶根管充填、根充后置入纤维桩、根充后置入纯钛桩。分别将各组牙根管口用玻璃离子水门汀封闭,用锥形束CT机常规扫描,将扫描结果刻盘;取近远中部的中央线定位,从根尖部到釉牙骨质界每3mm定一点,每侧定点三个,测量定点处的根管壁厚度。各组离体牙沿颊舌方向剖开,超声清洗机清洗,选取近远中部的中央线定位,从根尖部到釉牙骨质界每3mm定一点,每侧定点三个,游标卡尺测量定点处的根管壁厚度。结果 CBCT测量根管壁厚度与游标卡尺测量结果无统计学差异(P>0.05)。结论 CBCT因其三维成像能力,能准确分辨牙本质与根管内容物的界限,在测量根管壁厚度的时候具有精确的优势;应用CBCT能够减少根管壁侧穿的风险。Objective To provide reference for accurate application of CBCT in clinic, the root canal wall thickness of sealer and hot gutta percha, fiber post and titanium post was measured by CBCT. Methods There were 50 premolars extracted for orthodontics were cutoff along cemento-enamel junction,and randomly divided into the normal group, root canal preparation group, root canal filling group, fiber post group, titanium post group equally. Each group of the root canal orifices closed with glass ionomer cement. Then they were scaned by CBCT, and the images were recorded by light disk. After the central line of the mesial and distal positioned, the measurement points were fixed from the apical part to cemento-enamel junction with interval 3 mm, then the root canal wall thickness at the fixed points were measured with software. Each teeth were cut along the buccolingual direction, the measurement points were fixed from the apical part to cemento-enamel junction with interval 3 mm, then the root canal wall thickness at the fixed points were measured by vernier caliper. Results There was no significant difference in the measurement of the root canal wall thickness between CBCT and vernier caliper（P〉0.05）. Conclusion Because of three-dimensional imaging ability, CBCT can accurately distinguish the dentin and root canal contents, and has a precise advantage in measuring the wall thickness of the root canal. So using CBCT can reduce the risk of root canal perforation.

关 键 词：CBCT 根管内容物 根管壁厚度 测量 

分 类 号：R781.3[医药卫生—口腔医学]