Abstract
Dental alloys are widely used in fabrication of removable partial dentures, particularly as a dental framework. The present study aimed at studying the effect of the commercial mouthwashes on the corrosion behavior of the Co−Cr dental casting alloy. Corrosion behavior was investigated in alcohol-free and alcohol-containing mouthwashes added to artificial saliva solutions at room temperature by electrochemical tests recorded the open circuit potential (OCP) and current density, after the surface analysis of the samples was performed. During the early 250s, the OCP values showed significant changes, with the exception of one test group containing alcohol, where potential decreased continuously during the test, which also recorded the highest current density, different from the other groups. It was observed that the presence of alcohol increased the current density and the corrosion process in this alloy and the mouthwashes had more aggressive action in specimens submitted to solutions with alcohol in the composition.
Highlights
The material most commonly used to produce removable partial dentures and its frameworks is the Co-Cr alloys
This alloy is corrosion-resistant in different solutions, such as artificial saliva and physiological environments[9], due formation of a protective oxide layer, alterations on the corrosion-resistant properties of Co-Cr alloys may occur[15] when the material is exposed to an aggressive medium such as the oral cavity, associated to the presence of dental toothpastes and mouthwashes or fluorides
The open circuit potential curves (OCP) of Co-Cr alloy immersed on each experimental group are shown in Figure 1 and Table 2 shows the mean of OCP and current density recorded during the experiment
Summary
The material most commonly used to produce removable partial dentures and its frameworks is the Co-Cr alloys. Co−Cr alloys have been used in dentistry since 1930s, when they replaced the gold alloys for partial denture frameworks, mainly due to their good physical and mechanical properties[9,10,11], high biocompatibility[12,13], excellent corrosion resistance[14] and low cost[9,12,14] This alloy is corrosion-resistant in different solutions, such as artificial saliva and physiological environments[9], due formation of a protective oxide layer, alterations on the corrosion-resistant properties of Co-Cr alloys may occur[15] when the material is exposed to an aggressive medium such as the oral cavity, associated to the presence of dental toothpastes and mouthwashes or fluorides
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