Correlation between experimental cyclic fatigue resistance and numerical stress analysis for nickel-titanium rotary files

Min Ho Lee, Antheunis Versluis, Byung Min Kim, Chan Joo Lee, Bock Hur, Hyeon Cheol Kim

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Introduction: The aim of this investigation was to study cyclic fatigue resistance of various nickel-titanium (NiTi) rotary files under various root canal curvatures by correlating cyclic fatigue fracture tests with finite-element analysis (FEA). Methods: Four NiTi rotary instruments with different cross-sectional geometries but comparable sizes were selected for this study: ProTaper (Dentsply Maillefer, Ballaigues, Switzerland), ProFile (Dentsply Maillefer), HeroShaper (Micromega, Besanon, France), and Mtwo (VDW, Munich, Germany). The ProFile and HeroShaper files were of size 30/.06 taper, the Mtwo was of size 30/.05 taper, and the ProTaper was F3. The cyclic fatigue test was conducted in a custom-made device that simulated canals with 25°, 35°, and 45° curvature. For the FEA, the file models were meshed, and 17-mm long curved canals were modeled to have same curvatures as the cyclic fatigue tests. Numerical analysis was performed to determine the stress distributions in the NiTi instruments while they rotated in the simulated curved canals. Results: ProTaper (the stiffest instrument) showed the least cyclic fatigue resistance and highest stress concentration for all tested curvatures, whereas Mtwo showed the best cyclic fatigue resistance. A comparison between the FEA and fatigue results showed that when stresses increased, the number of instrument rotations to fracture decreased. Maximum stresses in the instruments predicted the approximate location of the fatigue fracture. Conclusions: The stiffer instrument had the highest stress concentration in FEA and the least number of rotations until fracture in the cyclic fatigue test. Increased curvature of the root canal generated higher stresses and shortened the lifetime of NiTi files. Finite-element stress analysis reflected cyclic fatigue fracture resistance.

Original languageEnglish (US)
Pages (from-to)1152-1157
Number of pages6
JournalJournal of Endodontics
Volume37
Issue number8
DOIs
StatePublished - Aug 1 2011

Fingerprint

Fatigue
Finite Element Analysis
Stress Fractures
Dental Pulp Cavity
nitinol
Switzerland
France
Germany
Equipment and Supplies

All Science Journal Classification (ASJC) codes

  • Dentistry(all)

Cite this

Correlation between experimental cyclic fatigue resistance and numerical stress analysis for nickel-titanium rotary files. / Lee, Min Ho; Versluis, Antheunis; Kim, Byung Min; Lee, Chan Joo; Hur, Bock; Kim, Hyeon Cheol.

In: Journal of Endodontics, Vol. 37, No. 8, 01.08.2011, p. 1152-1157.

Research output: Contribution to journalArticle

Lee, Min Ho ; Versluis, Antheunis ; Kim, Byung Min ; Lee, Chan Joo ; Hur, Bock ; Kim, Hyeon Cheol. / Correlation between experimental cyclic fatigue resistance and numerical stress analysis for nickel-titanium rotary files. In: Journal of Endodontics. 2011 ; Vol. 37, No. 8. pp. 1152-1157.
@article{8d22bab20c8f417b818d2aba6daec64c,
title = "Correlation between experimental cyclic fatigue resistance and numerical stress analysis for nickel-titanium rotary files",
abstract = "Introduction: The aim of this investigation was to study cyclic fatigue resistance of various nickel-titanium (NiTi) rotary files under various root canal curvatures by correlating cyclic fatigue fracture tests with finite-element analysis (FEA). Methods: Four NiTi rotary instruments with different cross-sectional geometries but comparable sizes were selected for this study: ProTaper (Dentsply Maillefer, Ballaigues, Switzerland), ProFile (Dentsply Maillefer), HeroShaper (Micromega, Besanon, France), and Mtwo (VDW, Munich, Germany). The ProFile and HeroShaper files were of size 30/.06 taper, the Mtwo was of size 30/.05 taper, and the ProTaper was F3. The cyclic fatigue test was conducted in a custom-made device that simulated canals with 25°, 35°, and 45° curvature. For the FEA, the file models were meshed, and 17-mm long curved canals were modeled to have same curvatures as the cyclic fatigue tests. Numerical analysis was performed to determine the stress distributions in the NiTi instruments while they rotated in the simulated curved canals. Results: ProTaper (the stiffest instrument) showed the least cyclic fatigue resistance and highest stress concentration for all tested curvatures, whereas Mtwo showed the best cyclic fatigue resistance. A comparison between the FEA and fatigue results showed that when stresses increased, the number of instrument rotations to fracture decreased. Maximum stresses in the instruments predicted the approximate location of the fatigue fracture. Conclusions: The stiffer instrument had the highest stress concentration in FEA and the least number of rotations until fracture in the cyclic fatigue test. Increased curvature of the root canal generated higher stresses and shortened the lifetime of NiTi files. Finite-element stress analysis reflected cyclic fatigue fracture resistance.",
author = "Lee, {Min Ho} and Antheunis Versluis and Kim, {Byung Min} and Lee, {Chan Joo} and Bock Hur and Kim, {Hyeon Cheol}",
year = "2011",
month = "8",
day = "1",
doi = "10.1016/j.joen.2011.03.025",
language = "English (US)",
volume = "37",
pages = "1152--1157",
journal = "Journal of Endodontics",
issn = "0099-2399",
publisher = "Elsevier Inc.",
number = "8",

}

TY - JOUR

T1 - Correlation between experimental cyclic fatigue resistance and numerical stress analysis for nickel-titanium rotary files

AU - Lee, Min Ho

AU - Versluis, Antheunis

AU - Kim, Byung Min

AU - Lee, Chan Joo

AU - Hur, Bock

AU - Kim, Hyeon Cheol

PY - 2011/8/1

Y1 - 2011/8/1

N2 - Introduction: The aim of this investigation was to study cyclic fatigue resistance of various nickel-titanium (NiTi) rotary files under various root canal curvatures by correlating cyclic fatigue fracture tests with finite-element analysis (FEA). Methods: Four NiTi rotary instruments with different cross-sectional geometries but comparable sizes were selected for this study: ProTaper (Dentsply Maillefer, Ballaigues, Switzerland), ProFile (Dentsply Maillefer), HeroShaper (Micromega, Besanon, France), and Mtwo (VDW, Munich, Germany). The ProFile and HeroShaper files were of size 30/.06 taper, the Mtwo was of size 30/.05 taper, and the ProTaper was F3. The cyclic fatigue test was conducted in a custom-made device that simulated canals with 25°, 35°, and 45° curvature. For the FEA, the file models were meshed, and 17-mm long curved canals were modeled to have same curvatures as the cyclic fatigue tests. Numerical analysis was performed to determine the stress distributions in the NiTi instruments while they rotated in the simulated curved canals. Results: ProTaper (the stiffest instrument) showed the least cyclic fatigue resistance and highest stress concentration for all tested curvatures, whereas Mtwo showed the best cyclic fatigue resistance. A comparison between the FEA and fatigue results showed that when stresses increased, the number of instrument rotations to fracture decreased. Maximum stresses in the instruments predicted the approximate location of the fatigue fracture. Conclusions: The stiffer instrument had the highest stress concentration in FEA and the least number of rotations until fracture in the cyclic fatigue test. Increased curvature of the root canal generated higher stresses and shortened the lifetime of NiTi files. Finite-element stress analysis reflected cyclic fatigue fracture resistance.

AB - Introduction: The aim of this investigation was to study cyclic fatigue resistance of various nickel-titanium (NiTi) rotary files under various root canal curvatures by correlating cyclic fatigue fracture tests with finite-element analysis (FEA). Methods: Four NiTi rotary instruments with different cross-sectional geometries but comparable sizes were selected for this study: ProTaper (Dentsply Maillefer, Ballaigues, Switzerland), ProFile (Dentsply Maillefer), HeroShaper (Micromega, Besanon, France), and Mtwo (VDW, Munich, Germany). The ProFile and HeroShaper files were of size 30/.06 taper, the Mtwo was of size 30/.05 taper, and the ProTaper was F3. The cyclic fatigue test was conducted in a custom-made device that simulated canals with 25°, 35°, and 45° curvature. For the FEA, the file models were meshed, and 17-mm long curved canals were modeled to have same curvatures as the cyclic fatigue tests. Numerical analysis was performed to determine the stress distributions in the NiTi instruments while they rotated in the simulated curved canals. Results: ProTaper (the stiffest instrument) showed the least cyclic fatigue resistance and highest stress concentration for all tested curvatures, whereas Mtwo showed the best cyclic fatigue resistance. A comparison between the FEA and fatigue results showed that when stresses increased, the number of instrument rotations to fracture decreased. Maximum stresses in the instruments predicted the approximate location of the fatigue fracture. Conclusions: The stiffer instrument had the highest stress concentration in FEA and the least number of rotations until fracture in the cyclic fatigue test. Increased curvature of the root canal generated higher stresses and shortened the lifetime of NiTi files. Finite-element stress analysis reflected cyclic fatigue fracture resistance.

UR - http://www.scopus.com/inward/record.url?scp=79960454290&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79960454290&partnerID=8YFLogxK

U2 - 10.1016/j.joen.2011.03.025

DO - 10.1016/j.joen.2011.03.025

M3 - Article

VL - 37

SP - 1152

EP - 1157

JO - Journal of Endodontics

JF - Journal of Endodontics

SN - 0099-2399

IS - 8

ER -