Abstract
Objective The aim of this study was to evaluate the electrochemical behavior of a cobalt-chromium (Co-Cr) dental alloy after immersion in denture cleansers. Method: Twenty-four specimens (Ø13x2mm) of Co-Cr were produced and divided into three groups (n=8) according to their experimental condition. The group 1 (control group) was composed only of distilled water, group 2 received a hygienic tablet (Corega Tabs™) at the moment that electrochemical test started, while the group 3 received the hygienic tablet (Corega Tabs™) 1h after immersion. The electrochemical tests recorded the open circuit potential (OCP) and current density (icorr). The surfaces of specimens were examined using a SEM. Data were statistically analyzed using analysis of variance (ANOVA) and Duncan test’ multiple comparisons post hoc analysis (α=0.05). Results: The values of OCP and icorr revealed statistically differences between the groups. The highest results were recorded for group 2 (-26.87±48.48mV; 0.29±0.22μA), which were similar to group 3 (-47.37±35.36mV; 0.26±0.10μA), and these values were difference to group 1 (-314.87±24.22mV; 0.50±0.17μA). SEM image show high corrosion with Corega Tabs™. Conclusion: The immersion in denture cleanser solution was not detrimental to the Co-Cr dental alloy and presented a lower tendency to corrosion process development than the control group.
Highlights
Dental alloys are a critical point to achieve greater longevity and success of the prosthetic treatment, the maintenance of patient’s oral healthy and quality of life
The results showed that tests in cleansers solutions resulted in significant differences between the open circuit potential (OCP) values indicating similar tendency to corrosion for the cleansers solutions and difference trend to control group
It can be stated that cleansers solutions alter the polarization behavior of Co-Cr dental alloys, significantly
Summary
Dental alloys are a critical point to achieve greater longevity and success of the prosthetic treatment, the maintenance of patient’s oral healthy and quality of life. When the patient receives the prosthesis, an important step of the treatment begins: the prosthetic care[1]. The patient must be informed about periodic returns to maintain the oral health, the prosthetic cleaning and the usual habits that will contribute to prevent problems such as mucosal lesions[2,3]. The chemical cleaning consists of immersing the prosthesis in solution with detergent, solvent or antimicrobial agents, and these solutions can be employed individually or associated with brushing[6]. The use of chemical cleaners associated with the mechanical method of cleaning could be an alternative for solving the problem of these patients with the cleaning of the dentures[8]. The immersion of denture in some solution has been indicated[8], because a great biofilm accumulation is the main etiological factor of stomatitis by Candida spp, where the attachment areas from the prosthesis are a potential reservoir of Candida albicans[1,9]
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