Department of Endodontics, School of Dentistry, Grande Rio University, Rio de Janeiro, RJ, Brazil.
Department of Endodontics, School of Dentistry, Grande Rio University, Rio de Janeiro, RJ, Brazil.
J Endod. 2018 Jun;44(6):1038-1041. doi: 10.1016/j.joen.2018.03.005. Epub 2018 Apr 18.
The aim of the present study was to evaluate the influence of blue thermal treatment on the torsional resistance behavior of M-Wire Reciproc files (VDW, Munich, Germany).
Ten M-Wire Reciproc R25 (25/0.08v) and 10 Reciproc Blue R25 (25/0.08v, VDW) instruments were used. The torque and angle of rotation at failure of new instruments (n = 10) were measured according to ISO 3630-1. Three millimeters of each instrument tip was clamped to a small load cell by a lever arm linked to the torsion axis. The fracture surface of all fragments was examined with a scanning electron microscope. Results were statistically analyzed using the Student t test at a significance level of P < .05.
The maximum torsional strength of M-Wire Reciproc was higher than Reciproc Blue instruments (P < .05). Reciproc Blue instruments showed significantly higher angular rotation to fracture than M-Wire Reciproc instruments (P < .05). Scanning electron microscopy of the fracture surface showed similar and typical features of torsional failure for the 2 types of instruments, including concentric abrasion marks and the fibrous dimple marks at the center of rotation.
Reciproc Blue instruments showed a higher angle of rotation to fracture but a lower torque to failure than M-Wire Reciproc instruments.
本研究旨在评估蓝色热疗对 M-Wire Reciproc 锉抗扭阻力行为的影响。
使用 10 根 M-Wire Reciproc R25（25/0.08v）和 10 根 Reciproc Blue R25（25/0.08v，VDW）器械。根据 ISO 3630-1 测量新器械（n=10）的扭矩和失效时的旋转角度。将每个器械尖端的 3 毫米用杠杆臂夹到一个小的负载单元上，杠杆臂连接到扭转轴上。所有碎片的断裂表面均用扫描电子显微镜检查。使用 Student t 检验在 P<.05 的显著性水平下对结果进行统计分析。
M-Wire Reciproc 的最大抗扭强度高于 Reciproc Blue 器械（P<.05）。Reciproc Blue 器械的断裂时的旋转角度明显高于 M-Wire Reciproc 器械（P<.05）。断裂表面的扫描电子显微镜显示，两种器械均具有相似的、典型的扭转失效特征，包括同心磨损痕迹和旋转中心的纤维凹痕。
Reciproc Blue 器械的断裂时的旋转角度较高，但抗扭强度低于 M-Wire Reciproc 器械。
