The Influence of, Surface Roughness and Different Types of Coating and Implantation Materials on the Frictional Forces of Aesthetic NiTi Arch Wires
Keywords:Coated arch wires; Static frictional resistance force; topography.
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 influence of surface roughness with the coating material types
(coating and ion implanted) on the frictional force of coated nickel titanium wires.
Methods: The sample of this study consisted of 140 segments of coated Nickle titanium arch wires for both
tests (friction test and roughness test) 70 segment for each test involving 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). The data were analyzed using one-way analysis of variance
(ANOVA) and Tukey’s post hoc significance difference tests. Differences were considered significant at
Results: The frictional forces of coated wires differ from uncoated control being higher in the control and
polymer coated wires and lesser in the rhodium, gold implanted and labial coated wires owing to differences
in the wire dimension, surface roughness, thickness of coating layer, and physical properties of coating
Conclusion: when tested in vitro, rhodium implanted wires produce the least amount of friction, Surface
roughness of fully coated arch wires was higher than non-coated counterpart and It appeared that frictional
forces does not correlated with the surface.
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