CYCLIC FATIGUE RESISTANCE OF HYFLEX EDM ROTARY FILES COMPARED TO M3 PRO GOLD AND MG3 BLUE ROTARY FILES (AN IN VITRO STUDY)

Buran, Ali Mohamed; Sherif, Raef Ahmed; Mobarak, Ahmed Moustafa

doi:10.21608/adjalexu.2025.368719.1607

CYCLIC FATIGUE RESISTANCE OF HYFLEX EDM ROTARY FILES COMPARED TO M3 PRO GOLD AND MG3 BLUE ROTARY FILES (AN IN VITRO STUDY)

Articles in Press

Document Type : Original Article

Authors

¹ Endodontics Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt

² Professor of Endodontics, Conservative Dentistry Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt

³ Endodontics, faculty of dentistry, Alexandria University, Alexandria, Egypt.

10.21608/adjalexu.2025.368719.1607

Abstract

Introduction: Despite the introduction of more durable files of various costs designed to minimize file separation and enhance the success rate of curved canal instrumentation. Given the benefits of NiTi rotary files, cyclic fatigue continues to pose considerable difficulty.
Aim of the study: This study aimed to assess the cyclic fatigue resistance of three different types of rotary files.
Materials and Methods: Three NiTi rotary file systems of different costs were assessed for their resistance to cyclic fatigue in vitro. All 48 files were divided into three equal groups (n=16): Group I: Hyflex EDM (Coltene). Group II: M3 ProGold (United Dental) and Group III: MG3 Blue (Shenzhen Perfect Medical Instruments). Each file was tested in a dynamic custom-made cyclic fatigue device simulating a 60° canal curvature with a 5mm radius of curvature. The TTF, the NCF, and the length of the fractured tip were recorded for each file.
Results: Hyflex EDM files demonstrated a higher resistance to cyclic fatigue, followed by M3 ProGold and MG3 Blue files in TTF and NCF. Hyflex EDM's NCF was significantly higher than MG3 Blue (P < 0.001), but not statistically significant compared to M3 ProGold (P > 0.05). The fractured tips' lengths varied significantly between MG3 Blue and M3 ProGold (P < 0.05).
Conclusion: Based on the cyclic fatigue results and the affordability of these files, Hyflex EDM and M3 Pro Gold demonstrated superior resistance, indicating that they may be viable options for root canal treatment of curved canals.

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