Proceedings of the KOSOMBE Conference (대한의용생체공학회:학술대회논문집)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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THERMOMECHANICAL STUDY OF LASER TREATED NiTi DENTAL ARCH WIRE

  • Kim, Young-Kon (Department of Biomedical Engineering, College of Engineering, The University of Iowa) ;
  • Park, Joon-B. (Department of Biomedical Engineering, College of Engineering, The University of Iowa) ;
  • Lakes, R.S. (Department of Biomedical Engineering, College of Engineering, The University of Iowa) ;
  • Andreasen, G.F. (Department of Orthodontics, College of Dentistry, The University of Iowa)
  • Published : 1989.05.26
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Abstract

A preliminary study has been conducted to demonstrate the effect of laser heat treatment on Ni Ti alloy dental arch wires ($0.016"\;{\times}\;0.022"$ and $0.018"\;{\times}\;0.026"$, rectangular shape). Changes in mechanical and thermal properties and surface morphologies are investigated by using optical and scanning electron microscope (SEM), energy dispersive x-ray microprobe analysis(EDX), differential scanning calorimeter (DSC), and micro hardness tester. The results indicate that the laser can affect the thermal equilibrium state of the localized surface. Titanium rich surface film is formed by the laser treatment. The surface film and rapidly resolidified underlying structures show better chemical resistance than the matrix material. Phase transition temperatures which are related to shape recovery temperatures are changed after laser treatment. Hardness of resolidified area and heat affected zone are lower than before treatment.

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