Citation Information :
Cardoso RM, Carvalho Alves NC, Conrado de Menezes SE, Batista SM, Vieira TM, Elgarten Rocha GN, de Melo Monteiro GQ, de Albuquerque DS. Influence of Temperature on the Cyclic Fatigue of Nickel–Titanium Instruments with Different Heat Treatments on Severely Curved Canals. J Contemp Dent Pract 2019; 20 (6):697-701.
Aim: This study aims to investigate the influence of temperatures of 20 °C and 37 °C on the resistance to cyclic fatigue of NiTi instruments with different heat treatments, as tested in severely curved simulated canals.
Materials and methods: Seventy-two instruments were distributed according to the temperature used (20 °C and 37 °C): XP-endo Shaper (30/0.01), ProDesign Logic (30/0.05), and iRaCe (30/0.04). The instruments were rotated freely until the occurrence of fracture inside an artificial severely curved stainless steel canal, which had a 90° angle of curvature and a curvature radius of 5 mm. Kolmogorov–Smirnov, Wilcoxon, ANOVA, and Kruskal–Wallis tests were performed. A p value of <0.05 was considered statistically significant.
Results: XP-endo Shaper instruments presented higher NCF values and time to failure compared with ProDesign Logic and iRaCe instruments at 20 °C and 37 °C (p < 0.001).
Conclusion: Within the limitations of this study, the results show that the body temperature (37 °C) significantly lowers the resistance to cyclic fatigue of all instruments compared with 20 °C.
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