Aktan Ali Murat, Yildirim Cihan, Karataşlıoğlu Emrah, Çiftçi Mehmet Ertuğrul, Aksoy Fatih
Department of Dentomaxillofacial Radiology, Faculty of Dentistry, University of Uşak, Uşak, Turkey.
Department of Endodontics, Faculty of Dentistry, University of Gaziantep, Gaziantep, Turkey.
Ann Anat. 2016 Nov;208:96-102. doi: 10.1016/j.aanat.2016.05.005. Epub 2016 Jun 23.
An accurate determination of the working length is indispensable for successful endodontic treatment. The aim of this study was to determine the influence of the voxel size and resolution of CBCT on measuring root canal working length. Thirty extracted single-rooted permanent teeth were used for this study. The working lengths of the teeth were determined by a researcher inserted a K-file into each canal until the tip became visible through the major foramen. The file was withdrawn until its tip was seen at the level of the coronal-most border of the major foramen under. The rubber stop was adjusted to the occlusal reference and the distance from the stop to the false tip was measured with digital calipers and recorded as the actual working length. The CBCT images were obtained with a Planmeca ProMax 3D Mid (Planmeca, Helsinki, Finland) using four sets of settings: from voxel size 0.5mm to voxel size 1.0mm. These measurements were compared with actual lengths (as a control group) using Analysis of Variance and the Dunnett Post Hoc Test. The Pearson correlation coefficient (r) and 95% confidence intervals were calculated to compare all measurement methods. The significance level was set at P<0.05. No significant difference was found among CBCT groups and working length. A highest correlation was found between the actual length and smallest voxel size and highest CBCT measurements (r=0.94). CBCT imaging can be used endodontic working length measurement and the smallest voxel size and highest resolution yielded more accurate results.
准确确定工作长度对于成功的根管治疗至关重要。本研究的目的是确定锥形束计算机断层扫描（CBCT）的体素大小和分辨率对测量根管工作长度的影响。本研究使用了30颗拔除的单根恒牙。研究人员将K锉插入每个根管，直至锉尖通过主要根尖孔可见，以此确定牙齿的工作长度。然后将锉退出，直到在主要根尖孔最冠方边界水平看到锉尖。将橡胶止动片调整到咬合参考位置，并用数字卡尺测量从止动片到假尖的距离，并记录为实际工作长度。使用Planmeca ProMax 3D Mid（芬兰赫尔辛基Planmeca公司）以四组设置获取CBCT图像：体素大小从0.5mm到1.0mm。使用方差分析和Dunnett事后检验将这些测量结果与实际长度（作为对照组）进行比较。计算Pearson相关系数（r）和95%置信区间以比较所有测量方法。显著性水平设定为P<0.05。在CBCT组和工作长度之间未发现显著差异。在实际长度与最小体素大小和最高CBCT测量值之间发现了最高的相关性（r=0.94）。CBCT成像可用于根管工作长度测量，最小体素大小和最高分辨率产生更准确的结果。
