Home Subscription Services
 
   

 
Endodontic Practice Today
ENDO Home Page
About the Editor
Editorial Board
Submit
Author Guidelines
Submission Form
Reprints / Articles
Permissions
Advertising
MEDLINE Search
Official Site
 
 
 
 
 
FacebookTwitter
Quintessence Publishing: Journals: ENDO

 

ENDO - Endodontic Practice Today

Edited by Antionio Bonaccorso, Bun San Chong, Edgar Schafer, and Luc van der Sluis

Official Publication of the Belgian Association for Endodontology and Traumatology (BAET), the French Society of Endodontics (SFE) and the Norwegian Endodontic Society (NEF)

ISSN (print) 1753-2809 • ISSN (online) 1753-2817

Publication:

Summer 2011
Volume 5 , Issue 2



Pages: 145 - 150
Back
Share Abstract:

Effect of thermal treatment on the flexural resistance of mechanically pre-fatigued NiTi rotary endodontic files

Saber, Shehab El-Din Mohamed / Fawzy, Amr S

Introduction: The aim of this study was to determine the effect of thermal treatment on the flexural resistance of mechanically pre-fatigued rotary nickel-titanium (NiTi) endodontic instruments. Methods: New and mechanically pre-fatigued rotary NiTi instruments were subjected to thermal treatments at 350˚C, 400˚C and 450˚C for 30 minutes, and then were rotated in a fatigue-testing device until fracture. The time to fracture was recorded and multiplied by the number of rotations per minute to obtain the number of cycles to failure (NCF) for each group. One-way analysis of variance (ANOVA) followed by Tukey–Kramer multiple-comparison post hoc test was used for the comparison between the different tested groups. Fractographic examination by scanning electron microscopy was also performed to study the morphological characteristics of the fractured instruments. Results: Statistical analysis showed that the thermal treatment at or below 400˚C of the new files did not improve the resistance to the flexural fatigue. Also, the flexural fatigue resistance of mechanically pre-fatigued files was significantly lower than that of new files. However, with thermal treatment significant improvement in the resistance to flexural fatigue was achieved, especially at 450˚C (P < 0.05). Conclusion: Thermal treatment seems to be of significance in improving the cyclic fatigue resistance or life span of fatigued or used NiTi files.

Full Text PDF File | Order Article

 

 
  © 2014 Quintessence Publishing Co Inc
 

Home | Subscription Services | Books | Journals | Multimedia | Events | Blog
Terms of Use | Privacy Policy | About Us | Contact Us | Advertising | Help | Sitemap | Catalog