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Evaluation of palatal arches made from low-nickel stainless steel wire
dos Santos, Rogério Lacerda; Pithon, Matheus Melo; de Souza, Margareth Maria Gomes; Bolognese, Ana Maria & Araújo, Mônica Tirre de Souza
Abstract
Aim:
To test the hypothesis that there is no difference between stainless steel wires and low-nickel stainless
steel ones regarding their mechanical behavior. Force, resilience and elasticity modulus produced by Coffin,
“W” arch, and Quad-helix appliances made of 0.032-inch and 0.036-inch wires were evaluated.
Methods:
Fifteen appliances of each type (Coffin, "W" arch, and Quad-helix) were made according to metal alloy and
wire thickness. All arches (12 groups of 15 appliances each) were submitted to mechanical compression
test by using an EMIC DL-10000 machine simulating activations of 5, 8, 10, and 12 mm. Analysis of variance
with multiple comparisons and Tukey’s test were used (P < 0.05) for analyzing statistically force and resilience
data.
Results:
The results showed that mechanical properties depended on shape of the appliance,
diameter of the wire, amount of activation, and metal alloy.
Conclusions:
Appliances made from lownickel
stainless steel alloy had higher release of force, resilience and elasticity modulus compared to those
made of stainless steel alloy.
Keywords
orthodontics, malocclusion, nickel, hypersensitivity
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