Desenvolvimento e caracterização de ligas de Co-Cr-Mo
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Data
2016-02-05
Autores
Martinelli, Carolina da Silva Machado [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
As ligas de Co-Cr têm o uso consagrado para reabilitação oral com próteses dentárias. Os procedimentos reabilitadores orais por implantes osseointegrados destacaram novas necessidades biomecânicas e estruturais das ligas metálicas. O objetivo deste estudo foi desenvolver e caracterizar três ligas metálicas de Co-Cr-Mo experimentais, para aplicação odontológica. Foram confeccionadas ligas de Co-Cr-Mo, com percentuais crescentes de Mo (6, 7 e 8% - A, B e C, respectivamente), por duas técnicas de processamento: L2, fusão para acréscimo de Mo a uma liga comercial certificada (American Society for Testing and Materials, 1996) (L1); e L3, fusão dos metais Co, Cr e Mo, comercialmente puros. As ligas em estudo foram caracterizadas microestruturalmente por microscopia eletrônica de varredura (MEV), espectroscopia de energia dispersiva (EDS), difração de raios X (DRX), fluorescência de raios X (XDR); fisicamente por microdureza, resistência à corrosão. Fibroblastos dérmicos humanos foram utilizados para avaliar a citotoxicidade das ligas experimentais após 1, 4 e 7 dias de cultura celular. Organização citoesquelética, adesão, viabilidade, morfologia e diferenciação celular foram avaliados por microscopia de fluorescência, análise bioquímica e MEV. Os resultados obtidos permitiram concluir que as ligas experimentais (L2A, L2B, L2C, L3A, L3B e L3C) apresentaram desempenho microsestrutural, mecânico e citotóxico superior à L1, sendo indicada para utilização biomédica e odontológica.
In Dentistry, the Co-Cr alloys are general used for oral rehabilitation by dental prosthesis. The oral rehabilitation procedures by osseointegrated implants point out to new metal alloys’ biomechanical and structural necessities. The aim of this study was develop and characterize three experimental Co-Cr-Mo alloys, for dental application. Three alloys will be made out with different Mo’s percentages by two processing techniques: L2, casting by addition of Mo to a certified commercial Co-Cr alloy (American Society for Testing and Materials, 1996) (L1); and L3, casting of purified commercial metals (Co, Cr, Mo). The experimental alloys were characterized by microstructure by digital optical microscopy, scanning electron microscopy, energy dispersive X-ray spectrometry, X-ray diffraction and X-ray fluorescence; and mechanically by microhardness and corrosion resistance. Human dermal fibroblasts were used to evaluate the biocompatibility of experimental Co-Cr alloys after 1, 4 and 7 days of culture. Cellular adhesion, proliferation, viability, cytoskeletal organization and morphology were investigated using fluorescence microscope, biochemical assay and SEM. Based on data was possible to concluded that experimental alloys (L2A, L2B, L2C, L3A, L3B e L3C) shown higher performance for microstructure, mechanical and cytotoxic as L1 and they are recommend to biomedical and dentistry applications.
In Dentistry, the Co-Cr alloys are general used for oral rehabilitation by dental prosthesis. The oral rehabilitation procedures by osseointegrated implants point out to new metal alloys’ biomechanical and structural necessities. The aim of this study was develop and characterize three experimental Co-Cr-Mo alloys, for dental application. Three alloys will be made out with different Mo’s percentages by two processing techniques: L2, casting by addition of Mo to a certified commercial Co-Cr alloy (American Society for Testing and Materials, 1996) (L1); and L3, casting of purified commercial metals (Co, Cr, Mo). The experimental alloys were characterized by microstructure by digital optical microscopy, scanning electron microscopy, energy dispersive X-ray spectrometry, X-ray diffraction and X-ray fluorescence; and mechanically by microhardness and corrosion resistance. Human dermal fibroblasts were used to evaluate the biocompatibility of experimental Co-Cr alloys after 1, 4 and 7 days of culture. Cellular adhesion, proliferation, viability, cytoskeletal organization and morphology were investigated using fluorescence microscope, biochemical assay and SEM. Based on data was possible to concluded that experimental alloys (L2A, L2B, L2C, L3A, L3B e L3C) shown higher performance for microstructure, mechanical and cytotoxic as L1 and they are recommend to biomedical and dentistry applications.
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Materiais biomédicos e odontológicos, Ligas Dentárias, Ligas de cobalto-cromo, Biomedical and dental daterials, Dental alloys, Cobalto-chromium alloys