锥形束CT测量牙周骨下袋体积方法的建立及体外研究实验  

A method to measure the volume of intrabony defect by CBCT: an in vitro study

作　　者：徐灵巧 贾平一[1] 欧阳翔英[1] 阳雯 路畅 周爽英[1] XU Ling-qiao;JIA Ping-yi;OUYANG Xiang-ying;YANG Wen;LU Chang;ZHOU Shuang-ying(Department of Periodontology,Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology,Beijing 100081,China)

机构地区：[1]北京大学口腔医学院.口腔医院牙周科国家口腔疾病临床医学研究中心口腔数字化医疗技术和材料国家工程实验室口腔数字医学北京市重点实验室,北京100081

出　　处：《北京口腔医学》2019年第1期42-46,共5页Beijing Journal of Stomatology

基　　金：首都临床特色应用研究(Z141107002514059)

摘　　要：目的建立CBCT测量牙周骨下袋体积的方法,用体外实验评价不同层厚CBCT及对不同结构骨下袋体积测量的准确性和重复性。方法在猪颌骨上制备骨缺损32个,用CBCT扫描,分别用0.1、0.125和0.15mm层厚重建,在软件中对骨缺损逐层着色并计算体积;用硅橡胶法获取实际体积。另制备一壁、二壁、三壁骨袋共20个,用CBCT测量骨下袋体积。将测量值与实际体积相比较,以检测方法的准确性。由2名检查者对随机挑选的10例骨下袋重复测量,间隔期为1周,评价测量的重复性。结果不同层厚CBCT测量的骨缺损体积与实际体积的差值均无显著性(P>0.05)。在测量不同骨壁结构的骨下袋时,CBCT测量值与实际体积间差值为(0.23±6.05)mm^3(P>0.05),占实际体积的1.13%。2名检查者重复测量的自身一致性检测的ICC值分别为0.997和0.998,检查者间一致性检测的ICC值为0.983。结论本研究建立的CBCT测量骨下袋体积的方法,用于不同骨壁结构骨下袋的体积测量时准确性高,具有可重复性。Objective To set up a new method to measure the volume of intrabony defect by CBCT,and to evaluate the accuracy and repeatability of this method via an in vitro study.Methods Thirty-two bony defects were created in pig jaws and scanned by CBCT.Data were reconstructed by three different slice thicknesses(0.1 mm,0.125 mm and 0.15 mm).The defect was colored on each section and the volume was computed in software.The actual volume was measured by impression material.Another 20 intrabony defects,including 1,2,3 wall intrabony defects,were created in pig jaws and volumetrically measured by CBCT.The consistency between CBCT measurement and actual volume was analyzed.Ten intrabony defects were randomly chosen for repeatability test,which were measured independently by two examiners and repeated a week later.Results The differences between volumetric measurements of CBCT with different slice thicknesses and actual volumes were all not statistically significant(P>0.05).CBCT measurement showed highly consistent with physical volume of intrabony defects with different configurations(P>0.05).The average difference between the two methods was only(0.23±6.05)mm^3,which was 1.13%of actual volume.The intraclass correlation coefficient(ICC)values of intra-observer were 0.997 and 0.998.ICC value of inter-observer was 0.983.Conclusion The CBCT volumetric method,set up by this study,was of high accuracy and good repeatability to measure volumes of intrabony defects with different configurations,which provided evidence for its clinical application.

关 键 词：牙周炎 骨下袋 锥形束CT 

分 类 号：R814.42[医药卫生—影像医学与核医学]