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ORIGINAL RESEARCH Table of Contents   
Year : 2012  |  Volume : 23  |  Issue : 5  |  Page : 638-642
Autoclaving and clinical recycling: Effects on mechanical properties of orthodontic wires

1 Department of Orthodontics, Shiraz Orthodontic Research Centre, Shiraz Dental School, Shiraz University of Medical Sciences, Shiraz, Islamic Republic of Iran
2 Department of Mechanical Engineering, Shiraz University, Shiraz, Islamic Republic of Iran
3 Department of Physics, Tarbiat Moddares University, Tehran, Islamic Republic of Iran
4 Pedodontics Department, Faculty of Dentistry, Kerman University of Medical Sciences, Kerman, Islamic Republic of Iran

Correspondence Address:
M Oshagh
Department of Orthodontics, Shiraz Orthodontic Research Centre, Shiraz Dental School, Shiraz University of Medical Sciences, Shiraz
Islamic Republic of Iran
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0970-9290.107382

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Background: About half of the orthodontists recycle and reuse orthodontic wires because of their costs. So when talking about reuse and sterilization of wires, their effects on mechanical properties of wires should be clarified. The purpose of this study was to assess the effects of sterilization and clinical use on mechanical properties of stainless steel wires. Materials and Methods: Thirty stainless steel orthodontic wires were divided into three equal groups of control, autoclave (sterilized by autoclave), and recycle group (wires were used for orthodontic patients up to 4 weeks, cleaned by isopropyl alcohol and sterilized by autoclave). The mechanical properties (tensile test, three-point loading test for load-deflection curve) were determined. Results: Fracture force, yield strength, stiffness and modulus of elasticity in recycle groups were significantly lower than the other groups (P < 0.05). Conclusion: Although recycle wires were softer than those of control group, relatively small differences and also various properties of available wires have obscured the clinical predictability of their application. There is seemingly no problem in terms of mechanical properties to recycle orthodontic wires.

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