Abstract
ABSTRACT Objective: The aim of the present study was to evaluate the influence, of immersion in different disinfectant solutions, on microhardness and surface roughness of a heat-cured acrylic resin. Methods: Specimens were immersed in distilled water, commercial vinegar for domestic use, sodium hypochlorite and hydrogen peroxide, for 150 hours or 300 hours (n=10). After periods of immersion, Knoop microhardness and surface roughness were evaluated using a microhardness tester and a roughness tester, respectively. The data were analyzed using two-way ANOVA and Holm-Sidak, at a level of significance of 5%. Results: The microhardness values ranged from 16.90 ± 0.33 to 17.80 ± 0.51 and roughness values from 0.05 ± 0.01 to 0.08 ± 0.02. There is no difference in microhardness and roughness between groups and times (p>0.05). Conclusion: Within the limitations of this study, it is possible to conclude that vinegar and hydrogen peroxide, as alternative disinfectant solutions for acrylic resin devices, did not promote deleterious effects on microhardness and polishing of a heat-cured acrylic resin used for the fabrication of prostheses, neither in the medium term nor the long term.
Highlights
Denture stomatitis, characterized by inflamed and erythematous mucosa that is covered by the denture, is the most common form of oral candidiasis [1]
The present study evaluated the influence of immersion in different disinfectants on the microhardness and roughness of a heat-cured resin
These properties, after immersion in vinegar and hydrogen peroxide, were no different from distilled water, used as the control, and sodium hypochlorite, which is regarded as the paradigm in disinfection
Summary
Denture stomatitis, characterized by inflamed and erythematous mucosa that is covered by the denture, is the most common form of oral candidiasis [1]. Immersion in disinfectant solutions has become a procedure adopted to supplement the cleaning of prosthetic surfaces [5,6,7] Of these solutions, glutaraldehyde and sodium hypochlorite are the most commonly used [8]. Vinegar is an accessible, low-cost acetic acid solution with low toxicity, and proven effectiveness against some microorganisms, such as Candida albicans [8,10]. This solution is considered to be a promising disinfectant in medicine and the food industry [8,11]. More studies are needed to evaluate the effect of immersion in vinegar on the microhardness and roughness of acrylic resins. The aim of the present study was to evaluate the influence of immersion in different disinfectants on the microhardness and roughness of a heat-cured acrylic resin
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