Analysis of cyclic fatigue resistance of different endodontic nickel-titanium rotary instruments: An in vitro study

Akshayraj Langaliya; Neeta Patel; Athulya Pallipurath; Girish Parmar; Anjali Kothari; Kairavi Jhala

doi:10.4103/JCDE.JCDE_204_23

Analysis of cyclic fatigue resistance of different endodontic nickel-titanium rotary instruments: An in vitro study

J Conserv Dent Endod. 2024 Jan;27(1):95-99. doi: 10.4103/JCDE.JCDE_204_23. Epub 2024 Jan 13.

Authors

Akshayraj Langaliya¹, Neeta Patel¹, Athulya Pallipurath¹, Girish Parmar², Anjali Kothari¹, Kairavi Jhala¹

Affiliations

¹ Department of Conservative Dentistry and Endodontics, AMC Dental College and Hospital, Ahmedabad, Gujarat, India.
² Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Ahmedabad, Gujarat, India.

Abstract

Aims: The aim of this in vitro study was to compare the cyclic fatigue resistance of three different endodontic nickel-titanium rotary instruments using a dynamic testing device.

Materials and methods: Ten files each of ProTaper Gold (PG), Hyflex Electro-discharge Machining (HEDM), and TruNatomy (TN) were tested in a custom-fabricated dynamic cyclic fatigue testing device at 60° curvature having a radius of curvature of 5 mm. The number of cycles to the fracture (NCF) of each instrument was calculated and three continuous groups were compared by the Kruskal-Wallis test and Dunn post hoc test was used for pairwise comparison.

Results: Cyclic fatigue resistance of HEDM was the highest, followed by TN. PG had the lowest among the three.

Conclusion: Within the limitations of the present in vitro results, it can be concluded that HEDM files appeared to be suitable for shaping complex canals with the greater number of cycles before it fractures.

Keywords: Cyclic fatigue; Hyflex Electro-Discharge Machining; NiTi; TruNatomy; rotary files.