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
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.
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
The results showed that mechanical properties depended on shape of the appliance,
diameter of the wire, amount of activation, and metal alloy.
Appliances made from lownickel
stainless steel alloy had higher release of force, resilience and elasticity modulus compared to those
made of stainless steel alloy.
orthodontics, malocclusion, nickel, hypersensitivity