The Effect of Temperature on Cyclic Fatigue of Nickel-titanium Rotary Endodontic Instruments

Comparison of cyclic fatigue resistance and bending properties of two reciprocating nickel‐titanium glide path files

“…Most modern NiTi files are manufactured with thermomechanically treated alloys. It has been demonstrated that the cyclic fatigue resistance of thermomechanically treated NiTi file is affected by ambient temperature (de Vasconcelos et al 2016, Dosanjh et al 2017. Thus, in the present study, all the NiTi files were tested in a water bath at 35°C to mimic the intracanal temperature in patients.…”

A critical appraisal of studies on cyclic fatigue resistance of engine‐driven endodontic instruments

“…These results suggest that both static and dynamic tests are currently poorly standardized. Numerous parameters have been shown to exert a marked impact on the results (Plotino et al ), with the environmental temperature clearly representing the most relevant parameter (Capar et al , De Vasconcelos et al , Shen et al , Dosanjh et al , Grande et al , Alfawaz et al , Yilmaz et al ). Environmental temperature has a 500% impact on the lifetime of an instrument (Grande et al ).…”

“…Certainly, the most relevant shortcoming of numerous studies is the fact that the impact of the environmental temperature was not taken into consideration as in the majority of fatigue studies information regarding the temperature used during the experiments is not provided. It has been shown in several studies (Capar et al , Shen et al , Dosanjh et al , Grande et al , Alfawaz et al , Yilmaz et al ) that the environmental temperature significantly influences the cyclic fatigue behaviour of NiTi instruments. Grande et al () tested several instruments at +20 °C and −20 °C, and the environmental temperature exerted a 300% to up to 500% impact on the lifetime of instruments.…”

“…Temperature has been reported as another important confounding factor in cyclic fatigue studies. It has been shown in several studies (Capar et al , Shen et al , Dosanjh et al , Grande et al , Alfawaz et al , Yilmaz et al ) that environmental temperature significantly influences the cyclic fatigue behaviour of NiTi instruments. The metallurgy of NiTi alloys exhibits an eminently different behaviour at room or at body temperature (Zupanc et al ).…”

Research that matters: studies on fatigue of rotary and reciprocating NiTi root canal instruments

“…Recent studies have demonstrated that several factors such as environmental temperature (Capar et al , Dosanjhi et al . , Grande et al , Shen et al . ) and trajectory of the instruments when introduced into canals (Plotino et al ) influence the outcome substantially.…”