Department of Endodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Department of Dental Biomaterials, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Clin Oral Investig. 2018 Apr;22(3):1433-1437. doi: 10.1007/s00784-017-2245-5. Epub 2017 Oct 13.
The aims of this study were to assess and compare the resistance to cyclic fatigue of XP-endo Shaper (XPS; FKG Dentaire, La Chaux-de-Fonds, Switzerland) instruments with TRUShape (TRS; Dentsply Tulsa Dental Specialties, Tulsa, OK, USA), HyFlex CM (HCM; Coltene, Cuyahoga Falls, OH, USA), Vortex Blue (VB; Dentsply Tulsa Dental Specialties), and iRace (iR; FKG Dentaire) nickel-titanium rotary instruments at body temperature.
Size 30, 0.01 taper of XPS, size 30, 0.04 taper of HCM, VB, iR, and size 30, 0.06 taper of TRS instruments were immersed in saline at 37 ± 1 °C during cyclic fatigue testing. The instruments were tested with 60° angle of curvature and a 3-mm radius of curvature. The number of cycles to failure (NCF) was calculated and the length of the fractured segment was measured. Fractographic examination of the fractured surface was performed using a scanning electron microscope. The data were analyzed statistically using Kruskal-Wallis H test and Mann-Whitney U tests. Statistical significance was set at P < 0.05.
XPS had a significantly greater NCF compared with the other instruments (P < 0.001). The topographic appearance of the fracture surfaces of tested instruments revealed ductile fracture of cyclic fatigue failure.
XPS instruments exhibited greater cyclic fatigue resistance compared with the other tested instruments.
XP-endo Shaper instruments could be used more safely in curved canals due to their higher fatigue resistance.
本研究旨在评估和比较 XP-endo Shaper（XPS；FKG Dentaire，La Chaux-de-Fonds，瑞士）、TRUShape（TRS；Dentsply Tulsa Dental Specialties，Tulsa，OK，USA）、HyFlex CM（HCM；Coltene，Cuyahoga Falls，OH，USA）、Vortex Blue（VB；Dentsply Tulsa Dental Specialties）和 iRace（iR；FKG Dentaire）镍钛根管锉在体温下的抗循环疲劳性能。
在循环疲劳测试中，将 XPS 的 30 号、0.01 锥度、HCM 的 30 号、0.04 锥度、VB、iR 和 TRS 的 30 号、0.06 锥度的镍钛锉浸泡在 37°C±1°C的盐水中。锉以 60°的弯曲角度和 3mm 的弯曲半径进行测试。计算失效循环次数（NCF）并测量断裂段的长度。使用扫描电子显微镜对断裂表面进行断口形貌分析。使用 Kruskal-Wallis H 检验和 Mann-Whitney U 检验对数据进行统计学分析。P<0.05 为统计学差异。
XPS 的 NCF 显著大于其他器械（P<0.001）。测试器械的断口形貌显示，循环疲劳失效呈韧性断裂。
XPS 器械的抗循环疲劳性能优于其他测试器械。
由于 XP-endo Shaper 器械具有更高的抗疲劳性，因此在弯曲根管中使用更为安全。
