Journal
JOURNAL OF ENDODONTICS
Volume 45, Issue 2, Pages 205-208Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.joen.2018.11.003
Keywords
Cyclic fatigue resistance; heat treatment; sodium hypochlorite; reciprocation
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Funding
- Scientific Research Projects Coordination Unit of Hacettepe University, Ankara, Turkey [THD-2017-15353]
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Introduction: The aim of this study was to evaluate the effect of different temperatures of sodium hypochlorite (NaOCl) on the cyclic fatigue resistance of the heat treated file systems. Methods: The cyclic fatigue resistance of Reciproc 25 (VDW Dental, Munich, Germany), Reciproc Blue R25 (VDW), WaveOne Primary (Dentsply Maillefer, Ballaigues, Switzerland), WaveOne Gold Primary (Dentsply Maillefer), and One Shape (25.06; Micro Mega, Besancon, France) was tested in the following conditions: control (no immersion), immersion in distilled water (DW) at 37 degrees C +/- 1 degrees C, immersion in DW at 60 degrees C +/- 1 degrees C, immersion in NaOCl at 37 degrees C +/- 1 degrees C, and immersion in NaOCl at 60 degrees C +/- 1 degrees C. The immersion period was 5 minutes for all conditions. A stainless steel artificial canal with a curvature of 60 and a 5-mm radius was used. The time to failure and fragment lengths were recorded for each instrument, and data were subjected to statistical analysis. Results: Reciproc Blue showed greater cyclic fatigue resistance in all conditions compared with the other systems (P <.05). Immersion in NaOCl at 60 degrees C negatively affected all instruments' cyclic fatigue resistance except Reciproc Blue. Immersion in DW at 60 degrees C increased the cyclic fatigue resistance of Reciproc Blue. Heat-treated files presented higher fatigue resistance than traditional files. Conclusions: A high temperature of NaOCl affected the cyclic fatigue life of the file systems. Instruments produced with heat treatment presented a longer fatigue life.
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