Análise topográfica e da cinética de corrosão da liga Ti-6Al-4V submetida a diferentes soluções enxaguatórias

• Autor(a) principal: Pires, Maria Flávia Araujo [UNESP]
• Data de Publicação: 2013
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/149511; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-01-27/000857092.pdf
• topic: Titânio; Corrosão; Peróxido de hidrogênio; Clorexidina; Titanium

The use of mouthwashes in the postoperative time after the placement of dental implant is essential to reduce the colonization of microorganisms in the peri-implant region. However, the oral environment is constantly exposed to the acids that can collaborate with the corrosive process of titanium. This study aimed to evaluate the topography and kinetics of corrosion of Ti-6Al-4V in 3 mouthwashes solutions (chlorhexidine gluconate 0.12% cetylpyridinium chloride 0.053 % and hydrogen peroxide 3 % ) compared with the artificial saliva ( pH 7,4), in 3 different times of the experiment ( initial, 7 days and after 14 days of immersion) . It was used 20 discs of Ti-6Al -4V (polished surface) which were divided into 4 groups (n = 5). The surface characterization of the specimens was performed in two stages of the experiment (initial and 14 days after immersion in solutions), by scanning electron microscopy (SEM), atomic force microscopy (AFM) and profilometry (roughness - Ra) expressed in nanometers. For the electrochemical test, standard tests were applied such as open circuit potential and electrochemical impedance spectroscopy (EIS) in the initial period, 7 days and 14 days after immersion in the tested solutions. To do so, the discs were individually kept in vials, incubated at 37.5 ° C throughout the experiment. They were immersed into 20 mL of each tested solution and for electrochemical test; the disks and 10 ml of the solutions were removed from the flask and adjusted in the electrochemical cell. Besides, the mass loss of the discs was calculated by subtracting (final mass - initial). The data were analyzed by the variant analysis ANOVA and for the statistically significant results; the Bonferroni test was applied, considering for all tests the significance level of 5 %. The AFM...