Effect of direct electric resistance heat treatment on mechanical properties of NiTi orthodontic arch wires
Conference proceedings article
Authors/Editors
Strategic Research Themes
No matching items found.
Publication Details
Author list: Kiattiwongse W., Khantachawana A., Santiwong P.
Publisher: Trans Tech Publications
Publication year: 2008
Volume number: 55-57
Start page: 249
End page: 252
Number of pages: 4
ISBN: 9780878493562
ISSN: 1022-6680
Languages: English-Great Britain (EN-GB)
Abstract
Two types of rectangular orthodontic archwires; NiTi™ and 40°CuNiTi, 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 NiTi™ increased with the increased current, whereas the change in hardness of 40°CuNiTi 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 NiTi™ increased after treating with 5.5 A current, while those of 40°CuNiTi 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. © 2008 Trans Tech Publications, Switzerland.
Keywords
Nickel titanium alloy, Orthodontic archwire, Surface hardness
Contact Information