Abstract
Statement of problem
Choosing the best disinfection agent for removable partial dentures may be challenging
since most commercially available disinfection solutions alter the properties of the
metal framework.
Purpose
The purpose of this in vitro study was to analyze the changes in the surface topography
and elemental composition of a cobalt-chromium (Co-Cr) alloy when immersed in a vinegar-hydrogen
peroxide mixture.
Material and methods
Disk-shaped specimens (N=50) were fabricated with Co-Cr alloy and randomly distributed
into 5 groups (N=10) according to the immersion solutions: distilled water (control)
(W); 0.5% sodium hypochlorite (H); 3% hydrogen peroxide and water in a 1:1 ratio (HP);
vinegar and water in a 1:1 ratio (V); and vinegar and 3% hydrogen peroxide mixture
in a 1:1 ratio (VHP). The immersions simulated 90 uses of 10 minutes each. The surface
topography and the elemental composition were analyzed with scanning electron microscopy
and energy-dispersive spectroscopy, before (T0) and after (T1) the immersions. The 2-way ANOVA for repeated measures was used for statistical comparisons
(α=.05).
Results
The tested mixture (VHP) did not change the metal surface topography or increase the
oxygen proportion, indicating that no corrosion occurred. Similarly, groups W, HP,
and V had no topographic changes and nonsignificant statistical differences at T1 for elemental composition (P>.05). However, the specimens immersed in sodium hypochlorite (H) showed staining,
surface irregularity, composition change, with an appearance of 22.56% more oxygen,
41% less chromium, and 28.77% less cobalt at T1 (P<.05).
Conclusions
The immersion of Co-Cr alloy in a vinegar-hydrogen peroxide mixture did not change
the surface structure of the metal.
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Article info
Publication history
Published online: December 19, 2022
Publication stage
In Press Corrected ProofFootnotes
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Identification
Copyright
© 2022 by the Editorial Council for the Journal of Prosthetic Dentistry.
