Structure, Composition, and Mechanical Properties of Australian Orthodontic Wires

Brian M. Pelsue, Spiros Zinelis, T. Gerard Bradley, David W. Berzins, Theodore Eliades, George Eliades
2009 Angle Orthodontist  
Objective: To investigate the surface morphology, structure, elemental composition, and key mechanical properties of various sizes and tempers of Australian wires. Materials and Methods: Three types of Australian wire were used: 0.016Љ regular, 0.018Љ regularϩ, and 0.018Љ specialϩ (A.J. Wilcock, Whittlesea, Victoria, Australia). Each type of wire was subjected to scanning electron microscopy (SEM) analysis, x-ray energy dispersive spectroscopy (EDS) investigation, Vickers hardness testing, and
more » ... dness testing, and tensile testing. The modulus of elasticity and ultimate tensile strength were determined. Hardness, modulus, and strength data were analyzed with one-way analysis of variance (ANOVA) and Tukey testing at the .05 level of significance. Results: All three types of Australian wire were found to possess considerably rough surfaces with striations, irregularities, and excessive porosity. All three wire types had high levels of carbon and a similar hardness, which ranged within 600 VHN (Vickers hardness number), and a similar modulus of elasticity (173 to 177 GPa). The 0.018Љ specialϩ had a significantly lower tensile strength (1632 MPa) than the 0.016Љ regular and the 0.018Љ regularϩ wire (2100 MPa). Conclusions: Australian wires did not show variation implied by the size or temper of the wires.
doi:10.2319/022408-110.1 pmid:19123699 fatcat:h3pz3ub5qfhopd3fccav6fwihe