Abstract
Statement of problem
A vinegar-hydrogen peroxide mixture has been reported to be effective in eliminating
Candida albicans and Staphylococcus aureus from acrylic resin, and its action has been reported to be comparable with that of
sodium hypochlorite or peracetic acid. However, the effects of this mixture on cobalt-chromium
alloys remain unknown.
Purpose
The purpose of this in vitro study was to evaluate the surface roughness, Knoop microhardness,
surface free energy, and wettability of a cobalt-chromium alloy when exposed to a
vinegar-hydrogen peroxide mixture.
Material and methods
Fifty specimens of cobalt-chromium alloy were fabricated and immersed for 900 minutes,
simulating 3 months of a daily 10-minute immersion in the following chemical agents
(n=10): distilled water (W); 0.5% sodium hypochlorite (H); 3% hydrogen peroxide and
water dilution in 1:1 ratio (HP); white-wine vinegar and water dilution in 1:1 ratio
(V); and vinegar and hydrogen peroxide mixture in 1:1 ratio (VHP). Surface roughness,
Knoop microhardness, surface free energy, and wettability were measured with single
blinding before and after immersions. Data were statistically analyzed by using 2-way
repeated measures ANOVA (α=.05).
Results
The vinegar-hydrogen peroxide mixture did not affect the surface roughness or Knoop
microhardness. However, 0.5% sodium hypochlorite significantly increased the roughness
and decreased microhardness. Surface free energy and wettability increased after immersions,
regardless of the types of solution.
Conclusions
Immersion in a vinegar-hydrogen peroxide mixture did not affect the surface characteristics
of a cobalt-chromium alloy.
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Article info
Publication history
Published online: January 15, 2021
Footnotes
Supported in part by BIC_PROPESQ/UFRGS.
Identification
Copyright
© 2020 by the Editorial Council for the Journal of Prosthetic Dentistry.
