Department of Endodontics, Universitat Internacional de Catalunya, Barcelona, Spain.
Department of Conservative Dentistry and Endodontics, Swargiya Dadasaheb Kalmegh Dental College and Hospital, Nagpur, India.
J Endod. 2019 Oct;45(10):1242-1247. doi: 10.1016/j.joen.2019.07.007. Epub 2019 Aug 29.
The purpose of this study was to evaluate and compare the centering ability and canal transportation of the ProTaper Next (PTN; Dentsply Maillefer, Ballaigues, Switzerland) and Self-adjusting File (SAF; ReDent-Nova, Ra'anana, Israel) systems in long oval root canals using cone-beam computed tomography imaging.
Fifty-six fully formed single-rooted mandibular premolars were selected with a buccolingual canal size 2 to 2.5 times the mesiodistal size at 5 mm from the apex, ranging from a 0°-10° canal curvature with a 5- to 6-mm radius. The teeth were divided into 2 groups (n = 28) and prepared with PTN or SAF according to the manufacturers' instructions. Cone-beam computed tomographic images were taken in the same position before and after instrumentation using modeling wax. The centering ability and canal transportation were calculated at 3, 6, and 9 mm from the apex in both mesiodistal and buccolingual directions. The mean and standard deviation were calculated, and the Student t test was used for comparative analysis.
significant difference for canal transportation was observed mesiodistally at 9 mm from the apex (P < .05) where the PTN shaved more dentin in 1 direction. A significant difference for the centering ability was observed at 6 mm buccolingually from the apex (P < .05) where the PTN was less centered in the canal compared with the SAF.
Both SAF and PTN were shown to be safe for being used in long oval canals. SAF resulted in less transportation at the coronal third in the mesiodistal direction and more centered at the middle third in the buccolingual direction compared with PTN.
本研究旨在通过锥形束 CT 成像评估和比较 Protaper Next（PTN；Dentsply Maillefer，Ballaigues，瑞士）和自调File（SAF；ReDent-Nova，Ra'anana，以色列）系统在长椭圆形根管中的中心定位能力和根管输送能力。
选择 56 颗完全形成的下颌前磨牙，颊舌向根管尺寸为近远中尺寸的 2 至 2.5 倍，根尖 5 毫米处的根管曲率为 0°-10°，根管半径为 5-6 毫米。这些牙齿被分为 2 组（n = 28），并根据制造商的说明使用 PTN 或 SAF 进行预备。在使用模型蜡进行器械预备前后，在相同位置拍摄锥形束 CT 图像。在近远中和颊舌向的根尖 3、6 和 9 毫米处计算中心定位能力和根管输送。计算平均值和标准差，并使用学生 t 检验进行比较分析。
在根尖 9 毫米处近远向的根管输送有显著差异（P <.05），其中 PTN 在一个方向上切削更多的牙本质。在根尖 6 毫米处颊舌向的中心定位能力有显著差异（P <.05），与 SAF 相比，PTN 在根管中的中心定位能力较差。
SAF 和 PTN 均被证明可安全用于长椭圆形根管。与 PTN 相比，SAF 在近中三分之一处的根管输送量较少，在颊舌三分之一处的中心定位能力较高。
