Saudi Endodontic Journal

ORIGINAL ARTICLE
Year
: 2020  |  Volume : 10  |  Issue : 2  |  Page : 131--136

Cyclic fatigue resistance of three heat-treated nickel-titanium instruments at simulated body temperature


Tarek M Elsewify1, Shehabeldin M Saber2, G Plotino3 
1 Endodontic Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
2 Endodontic Department, Faculty of Dentistry, Ain Shams University; Department of Endodontics, The British University, Cairo, Egypt
3 Endodontics Unit, Department of Oral and Maxillo-Facial Sciences, “Sapienza” University of Rome, Italy

Correspondence Address:
Dr. Tarek M Elsewify
Department of Endodontics, Faculty of Dentistry, Ain Shams University, Cairo
Egypt

Introduction: The aim of this study was to evaluate the cyclic fatigue resistance of three heat-treated nickel–titanium (NiTi) systems at simulated body temperature. Materials and Methods: Twelve instruments of similar apical diameter (#25) from three engine-driven NiTi instruments; WaveOne Gold (WOG), Hyflex EDM (HEDM), and M Pro system were tested for cyclic fatigue resistance at 37°C in simulated root canals with 60° angle of curvature and 5 mm curvature radius. All instruments were operated until fracture occurred. Mean and standard deviation of the time to fracture and fragment length were calculated, and statistical significance was set at 5%. The morphological characteristics of the fractured instruments were observed through scanning electron microscopy, and their chemical composition was determined using energy dispersive X-ray analysis (EDXA). Results: HEDM showed the highest resistance to cyclic fatigue at 37°C followed by WOG and M Pro instruments with a statistically significant difference. Scanning electron micrographs confirmed a predominantly ductile mode of fracture for all instruments. EDXA showed that WOG was composed of Ni (45.1 wt%) and Ti (37.0 wt%), HEDM was composed of Ni (52.9 wt%) and Ti (42.4 wt%), and M Pro was composed of Ni (49.7 wt%) and Ti (40.4 wt%). Conclusions: M Pro instrument showed the least cyclic fatigue resistance at 37°C compared to HEDM and WOG.


How to cite this article:
Elsewify TM, Saber SM, Plotino G. Cyclic fatigue resistance of three heat-treated nickel-titanium instruments at simulated body temperature.Saudi Endod J 2020;10:131-136


How to cite this URL:
Elsewify TM, Saber SM, Plotino G. Cyclic fatigue resistance of three heat-treated nickel-titanium instruments at simulated body temperature. Saudi Endod J [serial online] 2020 [cited 2020 Jul 11 ];10:131-136
Available from: http://www.saudiendodj.com/article.asp?issn=1658-5984;year=2020;volume=10;issue=2;spage=131;epage=136;aulast=Elsewify;type=0