Publication: Effect of direct electric resistance heat treatment on mechanical properties of NiTi orthodontic arch wires
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Issued Date
2008-12-01
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ISSN
10226680
Other identifier(s)
2-s2.0-62949105513
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Mahidol University
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SCOPUS
Bibliographic Citation
Advanced Materials Research. Vol.55-57, (2008), 249-252
Suggested 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. Vol.55-57, (2008), 249-252. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/19192
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Title
Effect of direct electric resistance heat treatment on mechanical properties of NiTi orthodontic arch wires
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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.