Paper Title:
Effect of Direct Electric Resistance Heat Treatment on Mechanical Properties of NiTi Orthodontic Arch Wires
  Abstract

Two types of rectangular orthodontic archwires; NiTiTM and 40oCuNiTi, were heat treated by Direct Electric Resistance Heat Treatment (DERHT) using different electric currents for 4 s. Their mechanical properties were then evaluated by micro hardness and three-point bending tests. After applying 4.5-5.5 A current, the hardness of NiTiTM increased with the increased current, whereas the change in hardness of 40oCuNiTi was slight. When 6 A current was applied, the hardness of the midspan of both wires significantly decreased. From the three-point bending test, unloading forces of NiTiTM increased after treating with 5.5 A current, while those of 40oCuNiTi decreased. However, both specimens lost their superelasticity when applied with 6 A current. In conclusion, after DERHT, various changes in mechanical properties can be noted in the different types of nickel titanium archwire.

  Info
Periodical
Advanced Materials Research (Volumes 55-57)
Main Theme
Edited by
Tawee Tunkasiri
Pages
249-252
DOI
10.4028/www.scientific.net/AMR.55-57.249
Citation
W. Kiattiwongse, A. Khantachawana, P. Santiwong, "Effect of Direct Electric Resistance Heat Treatment on Mechanical Properties of NiTi Orthodontic Arch Wires", Advanced Materials Research, Vols. 55-57, pp. 249-252, 2008
Online since
August 2008
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Price
$32.00
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