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Effect of Direct Electric Resistance Heat Treatment on Loading/Unloading Behavior of Nickel Titanium Orthodontic Wire
p.135
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Effect of Direct Electric Resistance Heat Treatment on Loading/Unloading Behavior of Nickel Titanium Orthodontic Wire

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Abstract:

Objective: The aim of this study was to investigate and compare the loading and unloading characteristics of various nickel-titanium (NiTi) and nickel-titanium-copper (NiTiCu) after direct electric resistance heat treatment method (Bender soarer-X equipment). Materials and Methods: Five types of commercial NiTi and NiTiCu orthodontic archwires [NiTi (W&H), NiTi (Ormco), CuNiTi (Ormco), Sentalloy (Tomy) and L&H (Tomy)] underwent heat treatment by the Bender soarer-X equipment and all samples underwent the three point bending tests to analyze their loading and unloading characteristics. Each type of wire was divided into 6 groups with 10 samples per group with one of the groups serving as non-heat treatment control group. The wire composition was analyzed by energy dispersive spectroscopy (EDS) method. Results: The results showed that the loading and unloading characteristics of W&H NiTi and Ormco NiTi after heat treatment were not significantly different from the non-heat treatment groups. But the Tomy Sentalloy, Tomy L&H and Ormco NiTiCu had significantly different results (p<0.05) after heat treatments. The factors which could affect the loading and unloading characteristics were the difference in alloy composition and the condition of heat treatment. Conclusion: Heat treatment increased the loading and unloading force of Tomy L&H and improved the shape forming ability of NiTi wire.

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Periodical:

Applied Mechanics and Materials (Volume 487)

Pages:

135-140

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.487.135

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Online since:

January 2014

Authors:

Surachai Dechkunakorn*, Chavarit Sujaritviriyakul, Niwat Anuwongnukroh, Nathaphon Tangit

Keywords:

Direct Electric Resistance Heat Treatment, Nickel-Titanium, Three-Point Bending

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] Kapila S, Sachdeva R: Mechanical properties and clinical applications of orthodontic wires. Am J Orthod Dentofac Orthop 96: 100-109, (1989).

Google Scholar

[2] Brantley WA, Webb CS, Soto U, et al: X-ray diffraction analyses of copper Ni–Ti orthodontic wires. J Dent Res 76: 401, (1997).

Google Scholar

[3] Andreasen GF, Hillen TB. An evaluation of 55 Cobalt substituted Nitinol wire for use in orthodontics. J Am Dent Assoc 82: 1373-5, (1971).

DOI: 10.14219/jada.archive.1971.0209

Google Scholar

[4] Andreasen GF, Morrow RE. Laboratory and clinical analyses of nitinal wire. Am J Orthod 73: 142-51, (1978).

Google Scholar

[5] Miura F, Mogi M, Ohura Y, Hamanaka H. The super-elastic property of Japanese NiTi alloy for use in orthodontics. Am J Orthod Dentofac Orthop 90: 1-10, (1986).

DOI: 10.1016/0889-5406(86)90021-1

Google Scholar

[6] Miura F, Mogi M, Ohura Y. Japanese NiTi alloy wire: use of the direct electric resistance heat treatment method. Eur J Orthod 10(3): 187-91, (1988).

DOI: 10.1093/ejo/10.1.187

Google Scholar

[7] Kiattiwongse W, Santiwong P, Khantachavana A. Effect of direct electric resistance heat treatment on the mechanical properties of NiTi orthodontic archwire. Thesis for degree of master of science in orthodontics of Faculty of Dentistry Mahidol University (2008).

DOI: 10.4028/www.scientific.net/amr.55-57.249

Google Scholar