Mechanical evaluation of quad-helix appliance made of low-nickel stainless steel wire

Rogério Lacerda dos SANTOS, Matheus Melo PITHON

Objective: The objective of this study was to test the hypothesis that there is no diference between stainless steel and low-nickel stainless steel wires as regards mechanical behavior. Force, resilience, and elastic modulus produced by Quad-helix appliances made of 0.032-inch and 0.036-inch wires were evaluated. Methods: Sixty Quad-helix appliances were made, thirty for each type of alloy, being iteen for each wire thickness, 0.032-in and 0.036-in. All the archwires were submitted to mechanical compression test using an EMIC DL-10000 machine simulating activations of 4, 6, 9, and 12 mm. Analysis of variance (ANOVA) with multiple comparisons and Tukey’s test were used (p < 0.05) to assess force, resilience, and elastic modulus. Results: Statistically signiicant diference in the forces generated, resilience and elastic modulus were found between the 0.032 and 0.036 inch thicknesses (p < 0.05). Conclusions: Appliances made of low-nickel stainless steel alloy had force, resilience, and elastic modulus similar to those made of stainless steel alloy.

Keywords: Orthodontic appliances. Hypersensitivity. Nickel.

How to cite: Santos RL, Pithon MM. Mechanical evaluation of quad-helix appliance made of low-nickel stainless steel wire. Dental Press J Orthod. 2013 May-June;18(3):35-8.

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