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The corrosion resistance of two non-noble alloys

Nickel-chromium and cobalt-chromium alloys are commonly used for crown and bridge castings. These non-noble dental alloys are much cheaper than noble dental alloys but on the other hand they have disadvantages related to their lower corrosion resistance and corrosion products (released ions), some of them recognized as toxic ions that may cause allergies and other oral pathologies. Therefore it is important to ...

Galvanic Corrosion of Two Non Noble Dental Alloys

This study aims to evaluate the corrosion resistance of two nonnoble dental alloys, namely, the Wiron®88 (Ni–Cr–Mo) and the Remanium 2000+ (Co–Cr–Mo–W). A noble alloy, the V-Gnathos® Plus (AuPt) previously studied was also considered for the purpose of comparison. The study was conducted in artificial saliva, pH 7.1, at 37 °C, by cyclic and linear sweep voltammetry, electrochemical impedance spectroscopy and ...

Caracterização de uma população infectada com o vírus da hepatite C

Estima-se que, mundialmente, o vírus da Hepatite C infecta cronicamente 130-170 milhões de pessoas. Em Portugal não se sabe ao certo o número de infectados. O estudo, que realizámos retrospectivamente e que reuniu dados até 2010, envolveu os dados de 121 doentes aleatoriamente escolhidos. Foi possível avaliar diferentes variáveis possibilitando uma perspetiva mais abrangente sobre esta doença e esta população. ...

Caso invulgar de esofagite infecciosa em doente imunocompetente

Corrosion of brass in a natural and artificial seawater under anaerobic conditions

The corrosion of brass in deoxygenated nonbuffered and buffered artificial and natural seawater was studied. The weight gains and the average corrosion rates of brass samples, immersed in both media during periods of 1 week, 1 and 3 months, were determined. The morphology of the corroded surfaces, with and without the corrosion products, was analyzed by visual observation and scanning electron microscopy (SEM)....

Electrochemical studies on the corrosion of brass in seawater under anaerobic c...

This paper reports an electrochemical study on the corrosion of brass in deoxygenated nonbuffered and buffered natural and artificial seawater solutions under anaerobic conditions. Cyclic voltammograms of brass and copper in natural seawater (NSW) and artificial seawater (ASW) were obtained in the passive and transpassive potential regions. The corrosion resistance of brass in natural and artificial seawater wa...