Objective: This study evaluated the resistance to cyclic and torsional strength of Prima One Gold and WaveOne Gold reciprocating systems. Methods: Cyclic fatigue was tested in an artificial canal with 60º curvature, 5 mm radius of curvature at 22ºC (n = 10) and 36.5ºC (n = 10). The torsional strength test followed ISO 3630-1, measuring torque and deflection angle until fracture (n = 10). The t-test was used to compare the two groups, and the significance level was set at 5%. Results: The Prima One Gold group presented greater resistance to cyclic fatigue at room temperature (p = 0.001) and at body temperature (p <0.001). For the torsional resistance test, the Prima One Gold group had a lower maximum torque value (p = 0.029), despite having a greater deflection angle (p <0.001). Conclusion: The Prima One Gold group showed greater resistance to cyclic fatigue regardless of temperature and a greater deflection angle. The WaveOne Gold group showed a greater maximum torque value than the Prima One Gold group. (EEJ-2021-05-087)Keywords: Alloys, Mechanical Tests, Shape Memory Alloys, Root Canal Preparation.