Iranian Center for Endodontic Research
  • Login
  • Register

Iranian Endodontic Journal

  • Register
  • Home
  • About the journal
  • Issues
    • Current
    • Archives
  • For Authors/Reviewers
    • Submissions
    • Author Guidelines
    • Ethics Policy
    • Editorial & Peer Review Policy
    • Privacy Statement
    • Reviewers Information
  • Indexing/Abstracting
  • Editorial Team
  • Announcements
  • Contact Us
  • Congress Proceedings
Advanced Search
  1. Home
  2. Archives
  3. Vol. 13 No. 1 (2018): Winter 2018
  4. Original Article

Vol. 13 No. 1 (2018)

November 2019

Cyclic Fatigue Resistance of Mtwo Rotary Instruments with two Different Instrumentation Techniques

  • Silvio Emanuel Acioly Conrado Menezes
  • Shirley Machado Batista
  • Diego Felipe Brandão de Magalhães
  • Diana Santana Albuquerque
  • Gabriela Queiroz de Melo Monteiro

Iranian Endodontic Journal, Vol. 13 No. 1 (2018), 16 November 2019 , Page 114-119
https://doi.org/10.22037/iej.v1i1.18453 Published: 2019-11-16

  • View Article
  • Download
  • Cite
  • Statastics
  • Share

Abstract

Introduction: The objective of this in vitro study was to evaluate whether cervical preparation with Mtwo files in a crown-down technique influences instrumentation time and the cyclic fatigue resistance of these instruments. Methods and Materials: Two instrumentation techniques were evaluated (manufacturer and crown-down). Each group consisted of 10 kits containing four Mtwo instruments (10/0.04, 15/0.05, 20/0.06, and 25/0.06), which were used to prepare three standard simulated curved resin canals. The mean instrumentation time and the corresponding number of cycles for each instrumentation (NCI) were recorded. The instruments were rotated at a constant speed of 300 rpm in a stainless-steel canal (diameter of 1.5 mm) at a 90° angle of curvature and 5-mm radius. The center of the curvature was 5 mm from the tip of the instrument. The cyclic fatigue resistance of the files was determined by counting the number of cycles to failure (NCF). Data were analyzed by the Mann-Whitney test. Results: The mean instrumentation time and NCI of files 10/0.04 and 15/0.05 were significantly lower (P<0.05) when the crown-down technique was used compared to the manufacturer’s method for the same tip size/taper file. There was no significant difference in the mean NCF between the two techniques. Conclusion: The crown-down technique did not interfere with resistance to cyclic fatigue. However, the shorter instrumentation time of files 10/0.04 and 15/0.05 could reduce the fracture risk in the case of reuse of these instruments.

Keywords: Crown Down; Cycles to Failure; Cyclic Fatigue; Instrument Fracture; Root Canal Instrumentation

 

  • PDF

How to Cite

1.
Menezes SEAC, Batista SM, Magalhães DFB de, Albuquerque DS, Monteiro GQ de M. Cyclic Fatigue Resistance of Mtwo Rotary Instruments with two Different Instrumentation Techniques. Iran Endod J [Internet]. 2019 Nov. 16 [cited 2025 Jun. 22];13(1):114-9. Available from: https://journals.sbmu.ac.ir/iej/article/view/18453
  • ACM
  • ACS
  • APA
  • ABNT
  • Chicago
  • Harvard
  • IEEE
  • MLA
  • Turabian
  • Vancouver
  • Endnote/Zotero/Mendeley (RIS)
  • BibTeX
  • Abstract Viewed: 344 times
  • PDF Downloaded: 473 times

Download Statastics

  • Linkedin
  • Twitter
  • Facebook
  • Google Plus
  • Telegram

Make a Submission

Make a Submission

Information

  • For Readers
  • For Authors
  • For Librarians

Developed By

Open Journal Systems

Indexing/Abstracting

This journal is indexed in:

  • PubMed
  • Europe PMC
  • Scopus
  • SCImago
  • MIAR
  • CINAHL
  • CAS (Chemical Abstracts)
  • Dimensions
  • DOAJ
  • EBSCO
  • FATCAT
  • Google Scholar
  • IMEMR (Index Medicus for the WHO Eastern Mediterranean Region)
  • Index Copernicus
  • ISC (Islamic World Science Citation Center)
  • Magiran
  • ROAD
  • SID (Scientific Information Database) 
  • SUDOC
  • UC Santa Barbara University
  • WIKIDATA
  • ZDB
    • This journal is Member of: COPE; ICMJ

Current Issue

  • Atom logo
  • RSS2 logo
  • RSS1 logo

Browse

  • Home
  • Archives
  • Submissions
  • About the Journal
  • Editorial Team
  • Contact

   Iranian Endodontic Journal is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0).

Powered by OJSPlus