Effect of Heat Treatment on Mechanical Properties of General Purpose Stainless Steel Archwire

Abstract:

Stainless steel has been used for orthodontic application and its properties have been continuously improved. The present study compares the mechanical properties of general purpose stainless steel archwire after heat treatment with commercial heat and non-heat treated stainless steel archwires (Highland, USA). The six parameters compared included: 1) maximum strength (MPa) 2) bending modulus (GPa) 3) bending stiffness (N/mm) 4) 0.1 offset bending force (N) 5) 0.2% offset yield strength (MPa) and 6) springback. The temperatures of heat treatment were 200°C, 250°C, 300°C and 350°C at various time duration of 10, 20 and 30 minutes. Fifteen specimens were used for each of the 12 temperature/time settings to evaluate each parameter. An Instron Universal Testing Machine was used for the three-point bend testing and the diameters were measured by a micrometer. Of all 12 settings it was found that for the condition, 300°C at 10 min and 300°C at 20 min the mechanical properties were closest to the commercial (Highland, heat-treated) stainless steel archwire and appropriate for used in clinic.

• Periodical: Advanced Materials Research (Volume 746)
• Pages: 444-449
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.746.444
• Online since: August 2013
• Authors: Pornkiat Churnjitapirom, Aksarin Wasumetharatsamee, Surachai Dechkunakorn, Niwat Anuwongnukroh, Theeralaksna Suddhasthira, Nathaphon Tangit
• Keywords: Heat Treatment, Stainless Steel Archwire, Three-Point Bending Test

References

[1] Premkumar S. Prep manual for undergraduates: Orthodontics: Elsevier; (2008).

[2] Nikolai RJ. Orthodontic wire: a continuing evolution. Semin Orthod. 1997 Sep; 3(3): 157-65.

[3] Kusy RP. Orthodontic Biomaterials: From the past to the present. Angle Othod 2002; 72(6): 501-12.

[4] Wilkinson JV. The effect of high temperatures on stainless steel orthodontic archwire. Aust. Dent. J. 1960; 5: 264-268.

[5] Backofen WA, Gales GF. The low temperature heat-treatment of stainless steel for orthodontics. Angle Orthod 1951; 21: 117-124.

[6] Kemler EA. Effect of low temperature heat treatment on the physical properties of orthodontic wire. Am. J. Orthod 1956; 42: 793.

[7] Anuwongnukroh N et al. Comparison of properties between general purpose stainless steel wire and commercial orthodontic stainless steel wire. Advanced Materials Research 2011; 378-379: 706-10.

DOI: 10.4028/www.scientific.net/amr.378-379.706

[8] Mutchler RW. The effect of heat treatment on the mechanical properties of orthodontic cobalt-chromium steel wire as compared with chromium-nickel steel wire. Northw. Univ. Bull. dent. Res., (1961).

[9] Asgharnia MK, Brantley WA. Comparison of bending and tension tests for orthodontic wires. Am J Orthod 1986; 89(3): 228-36.

DOI: 10.1016/0002-9416(86)90037-0

[10] Khier SE, Brantley WA, Fournelle RA. Structure and mechanical properties of as-received and heat-treated stainless steel orthodontic wires. Am J Orthod Dentofac OrthoP 1988; 93(3): 206-12.

DOI: 10.1016/s0889-5406(88)80005-2

[11] Cuoghi OA, Kasbergen GF, Santos PH, Mendonca MR, Tondelli PM. Effect of heat treatment on stainless steel orthodontic wires. Braz Oral Res 2011; 25(2): 128-34.

DOI: 10.1590/s1806-83242011005000007

[12] Carsten H. Influence of Heat Treatment On The Physical Properties Of Bent Orthodontic Wire. Angle Orthod 1966 Jul; 6(3): 236-47.