Evaluation of Load Deflection, Surface Roughness and Frictional Forces of Aesthetic Niti Arch Wires
Keywords:Coated arch wires, Load deflection force, Friction, Surface roughness.
Objective: The purpose of this in vitro study is that NiTi esthetic arch wires are preferred to match esthetic
braces; but the presence of coating layer is greatly affect friction during sliding mechanics.
The aims of this study were to evaluate the load deflection and the influence of surface roughness with the
coating material types on the frictional force of coated nickel titanium wires.
Method: The sample of this study consisted of 90 segments of uncoated and coated Nickle titanium arch
wires for three tests (friction test, roughness test and loading force test) 45 segment for each test involving
two wire dimensions (0.016 × 0.022 and 0.019 × 0.025 inches). The static frictional force was measured
through pulling the wires through a set of ceramic brackets by the universal testing machine while, the
surface topography of wires were assessed by using Atomic force microscope (AFM) and load deflection
test also measured. The data were analyzed using one-way analysis of variance (ANOVA) and Tukey’s post
hoc significance difference tests. Differences were considered significant at P<0.05.
Results: The frictional forces of gold wires is lesser than both control(uncoated) niti wire and epoxy coated
wire for both wire dimention (0.016×0.022 and 0.019×0.025) inch. Surface roughness of coated arch wires
is higher than control wires for both wire dimentions. Load deflection force of control wire is a higher than
coated wires for (0.016×0.022) inches wire dimension.
Conclusion: The gold plated wires had lower frictional force than both (control and epoxy coated wires).
Surface roughness of coated arch wires was higher than control(uncoated)arch wire. Load deflection force
of coated wires was lesser than control wires.
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