Nanomechanical and bending properties of nickel-titanium orthodontics archwires by depth-sensing indentation.

Autor: Nevárez-Rascón A; Research Department, Faculty of Dentistry, Autonomous University of Chihuahua, Chihuahua, Chihuahua, Mexico., Hurtado-Macías A; Department of Metallurgy and Structural Integrity, National Nanotechnology Laboratory, Research Center for Advanced Materials, Sociedad Civil, Chihuahua, Chihuahua, Mexico. Electronic address: abel.hurtado@cimav.edu.mx., Nevárez-Rascón MM; Research Department, Faculty of Dentistry, Autonomous University of Chihuahua, Chihuahua, Chihuahua, Mexico., Rodríguez-Rondón MJ; Research Department, Faculty of Dentistry, Autonomous University of Chihuahua, Chihuahua, Chihuahua, Mexico., Leal-Perez JE; Engineering Sciences Department, Faculty of Engineering Mochis, Autonomous University of Sinaloa, Los Mochis, Sinaloa, Mexico., Herrera-Basurto R; Research Support Department, Instituto Technological Institute of Morelia, Morelia, Michoacán, Mexico., Vázquez-Olvera G; Department of Metallurgy and Structural Integrity, National Nanotechnology Laboratory, Research Center for Advanced Materials, Sociedad Civil, Chihuahua, Chihuahua, Mexico., Auciello O; Departments of Materials Science and Engineering and Bioengineering, University of Texas at Dallas, Richardson, Tex.
Jazyk: angličtina
Zdroj: American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics [Am J Orthod Dentofacial Orthop] 2024 Oct 04. Date of Electronic Publication: 2024 Oct 04.
DOI: 10.1016/j.ajodo.2024.08.009
Abstrakt: Introduction: This study aimed to identify the link between alloy microstructures and the nanomechanical properties of different orthodontic archwires containing nickel-titanium (NiTi) by sensing sliced areas. Previous studies have focused on analyzing and contrasting physical properties such as microhardness, elasticity modulus, and resistance; therefore, the trend is to consider microstructural characteristics in detail.
Methods: Thirty archwire samples from 3 different commercial brands, American Orthodontics (AO), 3M Unitek (3M), and Borgatta, were analyzed through scanning electron microscopy and energy-dispersive x-ray spectroscopy, transmission electron microscopy, atomic force microscopy, Berkovich nanoindentation, and microtensile microscopy to determine their chemical-crystallographic characteristics and nanomechanical and bending characteristics.
Results: The identified formulations of AO and 3M had averages of 20 wt%, for Ni and 15.4 wt% for Ti, with lower concentrations for Borgatta. Alloys of Ni and Ti were distributed in different concentrates in the matrix of the archwires. The nanomechanical properties showed high values of the elastic modulus (82.8 ± 3.6 GPa) and hardness (6.4 ± 1.2 GPa) and a minor deformation degree of 0.38% for the AO wires, although the bending strength exhibited the highest values for 3M. No corrosion was observed with a prolonged hydrolytic attack on the surface of any of the wires (0.0-0.5 National Bureau of Standards units).
Conclusions: The highest nanomechanical properties and bending characteristics were observed for wires with higher NiTi precipitate contents, which were distributed differently in the alloy overall in the matrix. The nanoindentations sensed in different areas evidenced different mechanical properties for NiTi depending on its concentrations of Ti and enucleations.
(Copyright © 2024 American Association of Orthodontists. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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