AI Article Synopsis
- This study investigates how different temperatures (20 °C and 37 °C) affect the resistance to cyclic fatigue of NiTi instruments used in curved canals.
- Seventy-two instruments were tested under these temperatures, focusing on how long they last before fracturing while navigating a severely curved canal.
- Results indicated that at body temperature (37 °C), all instruments showed lower resistance to cyclic fatigue compared to 20 °C, highlighting the importance of temperature in these tests.
Article Abstract
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 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 ( < 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.
Clinical Significance: Body temperature is an important factor in the results of cyclic fatigue tests.
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