Home Print this page Email this page Users Online: 671
Home About us Editorial board Search Ahead of print Current issue Archives Submit article Instructions Subscribe Contacts Login 
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


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
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/sej.sej_122_19

Rights and Permissions

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.


[FULL TEXT] [PDF]*
Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)
 

 Article Access Statistics
    Viewed894    
    Printed26    
    Emailed0    
    PDF Downloaded98    
    Comments [Add]    

Recommend this journal