TY - JOUR
T1 - Effect of Temperature of Sodium Hypochlorite on Cyclic Fatigue Resistance of Heat-treated Reciprocating Files
AU - Keles, Ahmet
AU - Uzunoglu Ozyurek, Emel
AU - Uyanik, Mehmet Ozgur
AU - Nagas, Emre
N1 - Publisher Copyright:
© 2018 American Association of Endodontists
PY - 2019/2
Y1 - 2019/2
N2 - 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, Besançon, France) was tested in the following conditions: control (no immersion), immersion in distilled water (DW) at 37°C ± 1°C, immersion in DW at 60°C ± 1°C, immersion in NaOCl at 37°C ± 1°C, and immersion in NaOCl at 60°C ± 1°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 °C negatively affected all instruments’ cyclic fatigue resistance except Reciproc Blue. Immersion in DW at 60 °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.
AB - 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, Besançon, France) was tested in the following conditions: control (no immersion), immersion in distilled water (DW) at 37°C ± 1°C, immersion in DW at 60°C ± 1°C, immersion in NaOCl at 37°C ± 1°C, and immersion in NaOCl at 60°C ± 1°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 °C negatively affected all instruments’ cyclic fatigue resistance except Reciproc Blue. Immersion in DW at 60 °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.
KW - Cyclic fatigue resistance
KW - heat treatment
KW - reciprocation
KW - sodium hypochlorite
UR - http://www.scopus.com/inward/record.url?scp=85060697350&partnerID=8YFLogxK
U2 - 10.1016/j.joen.2018.11.003
DO - 10.1016/j.joen.2018.11.003
M3 - Article
C2 - 30711179
AN - SCOPUS:85060697350
SN - 0099-2399
VL - 45
SP - 205
EP - 208
JO - Journal of Endodontics
JF - Journal of Endodontics
IS - 2
ER -