5 Citations (Scopus)

Abstract

Introduction: The aim of this study was to investigate the relationship between fatigue life and resonance frequency (RF) of various types of nickel-titanium (NiTi) rotary instruments. In addition, the influence of NiTi instruments with different manufacturing methods on cyclic loading was evaluated by using RF as a parameter. Methods: Twenty-eight ProFile instruments and 10 Twisted File instruments were subjected to cyclic fatigue-loading until fracture by repeated preparation with simulated root canals made of clear resin. The RF of each sample was recorded immediately after the simulated canal block was prepared. For each sample, the microscopic images on the fracture surface, change in lengthening deformation, number of canal blocks prepared, and corresponding RF changes were recorded. Results: For all the tested instruments, RF values decreased gradually before breakdown when the fatigue failure of the instruments was associated with plastic deformation. In addition, there was a linear relationship between the RF change and the corresponding deformation of the failed instruments. Conclusions: These results demonstrate that the RF analysis has potential as a tool for structural analysis in NiTi instruments.

Original languageEnglish
Pages (from-to)993-996
Number of pages4
JournalJournal of Endodontics
Volume37
Issue number7
DOIs
Publication statusPublished - Jul 2011

Fingerprint

Fourier Analysis
Fatigue
Dental Pulp Cavity
Plastics
nitinol

Keywords

  • Cyclic fatigue
  • fracture
  • natural frequency
  • rotary NiTi instrument

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

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title = "Structural analysis of cyclic-loaded nickel-titanium rotary instruments by using resonance frequency as a parameter",
abstract = "Introduction: The aim of this study was to investigate the relationship between fatigue life and resonance frequency (RF) of various types of nickel-titanium (NiTi) rotary instruments. In addition, the influence of NiTi instruments with different manufacturing methods on cyclic loading was evaluated by using RF as a parameter. Methods: Twenty-eight ProFile instruments and 10 Twisted File instruments were subjected to cyclic fatigue-loading until fracture by repeated preparation with simulated root canals made of clear resin. The RF of each sample was recorded immediately after the simulated canal block was prepared. For each sample, the microscopic images on the fracture surface, change in lengthening deformation, number of canal blocks prepared, and corresponding RF changes were recorded. Results: For all the tested instruments, RF values decreased gradually before breakdown when the fatigue failure of the instruments was associated with plastic deformation. In addition, there was a linear relationship between the RF change and the corresponding deformation of the failed instruments. Conclusions: These results demonstrate that the RF analysis has potential as a tool for structural analysis in NiTi instruments.",
keywords = "Cyclic fatigue, fracture, natural frequency, rotary NiTi instrument",
author = "Huang, {Haw Ming} and Chang, {Wei Jen} and Teng, {Nai Chia} and Lin, {Hung Lung} and Hsieh, {Sung Chih}",
year = "2011",
month = "7",
doi = "10.1016/j.joen.2011.03.022",
language = "English",
volume = "37",
pages = "993--996",
journal = "Journal of Endodontics",
issn = "0099-2399",
publisher = "Elsevier Inc.",
number = "7",

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TY - JOUR

T1 - Structural analysis of cyclic-loaded nickel-titanium rotary instruments by using resonance frequency as a parameter

AU - Huang, Haw Ming

AU - Chang, Wei Jen

AU - Teng, Nai Chia

AU - Lin, Hung Lung

AU - Hsieh, Sung Chih

PY - 2011/7

Y1 - 2011/7

N2 - Introduction: The aim of this study was to investigate the relationship between fatigue life and resonance frequency (RF) of various types of nickel-titanium (NiTi) rotary instruments. In addition, the influence of NiTi instruments with different manufacturing methods on cyclic loading was evaluated by using RF as a parameter. Methods: Twenty-eight ProFile instruments and 10 Twisted File instruments were subjected to cyclic fatigue-loading until fracture by repeated preparation with simulated root canals made of clear resin. The RF of each sample was recorded immediately after the simulated canal block was prepared. For each sample, the microscopic images on the fracture surface, change in lengthening deformation, number of canal blocks prepared, and corresponding RF changes were recorded. Results: For all the tested instruments, RF values decreased gradually before breakdown when the fatigue failure of the instruments was associated with plastic deformation. In addition, there was a linear relationship between the RF change and the corresponding deformation of the failed instruments. Conclusions: These results demonstrate that the RF analysis has potential as a tool for structural analysis in NiTi instruments.

AB - Introduction: The aim of this study was to investigate the relationship between fatigue life and resonance frequency (RF) of various types of nickel-titanium (NiTi) rotary instruments. In addition, the influence of NiTi instruments with different manufacturing methods on cyclic loading was evaluated by using RF as a parameter. Methods: Twenty-eight ProFile instruments and 10 Twisted File instruments were subjected to cyclic fatigue-loading until fracture by repeated preparation with simulated root canals made of clear resin. The RF of each sample was recorded immediately after the simulated canal block was prepared. For each sample, the microscopic images on the fracture surface, change in lengthening deformation, number of canal blocks prepared, and corresponding RF changes were recorded. Results: For all the tested instruments, RF values decreased gradually before breakdown when the fatigue failure of the instruments was associated with plastic deformation. In addition, there was a linear relationship between the RF change and the corresponding deformation of the failed instruments. Conclusions: These results demonstrate that the RF analysis has potential as a tool for structural analysis in NiTi instruments.

KW - Cyclic fatigue

KW - fracture

KW - natural frequency

KW - rotary NiTi instrument

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