Comparisons of nanoindentation, 3-point bending, and tension tests for orthodontic wires

Masahiro Iijima, Takeshi Muguruma, William A. Brantley, Itaru Mizoguchi

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Introduction: The purposes of this study were to obtain information about mechanical properties with the nanoindentation test for representative wire alloys and compare the results with conventional mechanical tests. Methods: Archwires having 0.016 × 0.022-in cross sections were obtained of 1 stainless steel, 1 cobalt-chromium-nickel, 1 beta-titanium alloy, and 2 nickel-titanium products. Specimens of as-received wires were subjected to nanoindentation testing along the external surfaces and over polished cross sections to obtain values of hardness and elastic modulus. Other specimens of as-received wires were subjected to Vickers hardness, 3-point bending, and tension tests. All testing was performed at 25°C. Results: Differences were found in hardness and elastic modulus obtained with the nanoindentation test at the external and cross-sectioned surfaces and with the conventional mechanical-property tests. Mechanical properties obtained with the nanoindentation test generally varied with indentation depth. Conclusions: The 3 testing methods did not yield identical values of hardness and elastic modulus, although the order among the 5 wire products was the same. Variations in results for the nanoindentation and conventional mechanical property tests can be attributed to the different material volumes sampled, different work-hardening levels, and an oxide layer on the wire surface.

Original languageEnglish
Pages (from-to)65-71
Number of pages7
JournalAmerican Journal of Orthodontics and Dentofacial Orthopedics
Volume140
Issue number1
DOIs
Publication statusPublished - 2011 Jul 1
Externally publishedYes

ASJC Scopus subject areas

  • Orthodontics

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