https://doi.org/10.32067/GIE.2021.35.02.58
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The impact of composition, core metal mass and phase transformation behaviour on the dynamic cyclic fatigue of Ni-Ti files at different temperatures

Authors

Mohamed Salah Abdel Aziz Elwakeel
mohamed.elwakeel@dent.asu.edu.eg
https://orcid.org/0000-0002-9887-9126
Endodontic department, Faculty of dentistry, Ain Shams university, Egypt.
Ahmed Abdel Rahman Hashem
Department of Endodontics, Faculty of Dentistry, Ain Shams University, Egypt.
Sarah Hossam Fahmy
Department of Endodontics, Faculty of Dentistry, Ain Shams University, Egypt.
Shehabeldin Mohamed Saber
Department of Endodontics, Faculty of Dentistry, Ain Shams University and Department of Endodontics, Faculty of Dentistry, and Center of Innovative Dental sciences, The British University, Egypt.
Gianluca Plotino
Grande Plotino & Torsello, Private Practice in Rome, Italy.

Aim: To assess impact of elemental composition, core metal mass and phase transformation behaviour on the dynamic cyclic fatigue resistance of three Ni-Ti rotary files at room and body temperatures.

Methods: Twenty instruments of each system were tested for dynamic cyclic fatigue resistance in a simulated root canal with a 90˚ angle of curvature and a 5-mm radius of curvature at room and body temperature. The core metal mass at the fractured surface of each instrument was calculated by Image J software analysis of SEM images. The energy dispersive X-ray analysis was used to assess file composition. Scanning calorimetry was used to assess the structural phase state and the transformation temperature. One-way analysis of variance (ANOVA) was performed to determine any statistical difference amongst groups. For inter-group comparison, the unpaired t-test was used.

Results: HEDM showed significantly higher TtF and NCF values than AFBS and ZB-F6 instruments, at both temperatures tested. The mean core metal mass was smallest in HEDM followed by AFBS with no statistical difference between them, while ZB-F6 had the significantly largest metal core. EDX analysis showed that all the instruments were mainly composed by nickel and titanium. DSC analysis revealed that HEDM and AFBS exhibited a martensitic phase at body (37˚C) and room temperature (25˚C), whereas ZB-F6 revealed an austenitic phase at body temperature.

Conclusions: Dynamic cyclic fatigue resistance increased when the instruments had less cross-sectional metal mass, less Ni (wt%), a thermally treated surface, and a martensite phase at body temperature.

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Mohamed Salah Abdel Aziz Elwakeel, Endodontic department, Faculty of dentistry, Ain Shams university

Teaching Assistant, Department of Endodontics, Faculty of Dentistry, Egyptian russian university in Egypt.‎

Ahmed Abdel Rahman Hashem , Department of Endodontics, Faculty of Dentistry, Ain Shams University

1-Professor and head of Endodontics Department , Faculty of Dentistry, Ain Shams University in Egypt.‎
2-Director of Microscope Centre, Future University, Egypt.
3-Visiting Professor, Cleveland Dental Institute, USA
4-Secretary General, Egyptian Association of Endodontists
5-International member, American Association of Endodontists
6-Member, British Endodontic Society
7-Member, Scientific Advisory board, Journal of Endodontists
8-Private practice limited to Micro-Endodontics

Sarah Hossam Fahmy, Department of Endodontics, Faculty of Dentistry, Ain Shams University

1-Lecturer of Endodontics, Department of Endodontics, Faculty of Dentistry, Ain Shams University in Egypt.‎

How to Cite

Elwakeel, M. S. A. A., Hashem , A. A. R., Fahmy, S. H. ., Saber, S. M., & Plotino, G. (2022). The impact of composition, core metal mass and phase transformation behaviour on the dynamic cyclic fatigue of Ni-Ti files at different temperatures. Giornale Italiano Di Endodonzia, 36(1). https://doi.org/10.32067/GIE.2021.35.02.58
Copyright (c) 2022 Mohamed Salah Abdel Aziz Elwakeel, Ahmed Abdel Rahman Hashem , Sarah Hossam Fahmy, Shehabeldin Mohamed Saber, Gianluca Plotino Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Giornale Italiano di Endodonzia has chosen to apply the Creative Commons Attribution NonCommercial 4.0 International License (CC BY-NC 4.0) to all manuscripts to be published.