Eur Endod J. Ahead of Print: EEJ-88700 | DOI: 10.14744/eej.2022.88700

Cyclic fatigue and torsional strength of a new thermally treated reciprocating system

Marco Loureiro¹, Pedro HenriqueSouza Calefi², Thalles Eduardo Ribeiro¹, Rodrigo Vivan², Marco AntonioHungaro Duarte², Patrícia Correia de Siqueira¹, Daniel Decurcio^1
1School of Dentistry, Federal University of Goiás, Goiânia, Brazil
²Bauru School of Dentistry, University of São Paulo, Bauru, Brazil

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.

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