Influence of Temperature on the Cyclic Fatigue Resistance of Reciproc Blue Instruments

JOURNAL TITLE: The Journal of Contemporary Dental Practice

1. Christianne TV Telles
2. Andressa C de Almeida
3. Diana S Albuquerque
4. Thalita M Vieira
5. Silmara de Andrade Silva
6. Nayane CC Alves
Publishing Year
Author Affiliations
1. com.mps.common.model.Contributor@683b3bb3 ,
2. com.mps.common.model.Contributor@216e32ea ,
3. com.mps.common.model.Contributor@f6ecb42 ,
4. com.mps.common.model.Contributor@8757566 ,
5. com.mps.common.model.Contributor@39a22178 ,
6. com.mps.common.model.Contributor@698badc4
Article keywords
Body temperature, Cyclic fatigue, Nickel titanium, Reciproc blue


Aim: To evaluate the cyclic fatigue resistance of Reciproc blue (RB) 40/0.06 instruments tested at room temperature (20° ± 0.5°C) and at body temperature (37° ± 0.5°C) in a simulated stainless steel canal. Materials and methods: Twenty-four new RB 40/0.06 instruments were randomly divided into two groups (n = 12) according to the temperature used. Dynamic fatigue testing was performed using an artificial stainless steel canal with a 60° curvature angle and a 5-mm radius of curvature. The temperature was controlled throughout the experiment with an underwater thermometer and a thermostat. The data were analyzed descriptively using the IBM SPSS 23.0 program, considering p < 0.05. Results: The time to fracture of the RB instruments differed significantly between the two temperatures (1083.82 seconds at 20°C and 403.80 seconds at 37°C). No significant differences were found in fragment size. Conclusion: An increase in temperature reduces the cyclic fatigue resistance of RB 40/0.06 instruments. The results of the study suggest that an intracanal cooling system can be favorable to the fracture resistance of the tested instruments. Clinical significance: A cooling system of the root canal system is important in endodontic as it favors the cyclic fatigue resistance of Ni-Ti instruments.

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