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Avaliação da microdureza e do grau de conversão de resinas compostas convencionais e bulk fill de diferentes cores
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| 1.9 MB | Adobe PDF |
Authors
Abstract(s)
Objetivos: Análise da Microdureza de Vickers e do Grau de Conversão de resinas compostas microhíbridas e nanoparticuladas.
Materiais e Métodos: Foram testadas 4 resinas compostas: 2 da 3MTM Filtek Z250 (A1 e A3) e 2 da 3MTM Filtek One Bulk Fill (A1 e A3). Para a realização do estudo da Microdureza de Vickers foram construídos 40 discos (10x2mm). As amostras foram divididas em 8 grupos experimentais. Uma vez fotopolimerizados os discos, foram de imediato colocados no microdurómetro e foi aplicada uma força de 29,42N durante 5
segundos. Para avaliar o grau de conversão foram utilizados 4 discos (10x2mm), 1 por cada resina em estudo. Os seus espetros foram delineados recorrendo à técnica de Espetroscopia por FTIR.
Resultados: Após a realização da análise estatística, foi possível concluir que as variáveis “Resina” e “Tempo” afetam de forma significativa a Microdureza. No que concerne ao grau de conversão, foi realizada uma comparação dos espetros dos vários grupos de estudo, e desta forma foi possível a identificação de pontos em números de onda específicos, os quais confirmam que o processo de conversão, foi realizado após o
processo de polimerização das resinas.
Conclusões: As propriedades mecânicas das resinas, nomeadamente o grau de conversão e a microdureza, são influenciadas pelas composições das resinas e tempos de fotopolimerização.
Objectives: Analysis of Vickers Microhardness and Conversion Degree of microhybrid and nanoparticulate composite resins. Materials and Methods: Four composite resins were tested: 2 from 3M Filtek Z250 (A1 and A3) and 2 from 3M Filtek One Bulk Fill (A1 and A3). For the Vickers Microhardness study, 40 discs (10x2mm) were fabricated. The samples were divided into 8 experimental groups. Once the discs were light-cured, they were immediately placed in the microdurometer, and a force of 29.42N was applied for 5 seconds. To evaluate the conversion degree, 4 discs (10x2mm), one for each resin under study, were used. Their spectra were outlined using FTIR Spectroscopy. Results: After performing the statistical analysis, it was possible to conclude that the variables "Resin" and "Time" significantly affect Microhardness. Regarding the conversion degree, a comparison of the spectra from various study groups was conducted, and this allowed the identification of specific wavenumbers confirming that the conversion process occurred after the resin polymerization process. Conclusions: The mechanical properties of resins, particularly the conversion degree and microhardness, are influenced by resin compositions and photopolymerization times.
Objectives: Analysis of Vickers Microhardness and Conversion Degree of microhybrid and nanoparticulate composite resins. Materials and Methods: Four composite resins were tested: 2 from 3M Filtek Z250 (A1 and A3) and 2 from 3M Filtek One Bulk Fill (A1 and A3). For the Vickers Microhardness study, 40 discs (10x2mm) were fabricated. The samples were divided into 8 experimental groups. Once the discs were light-cured, they were immediately placed in the microdurometer, and a force of 29.42N was applied for 5 seconds. To evaluate the conversion degree, 4 discs (10x2mm), one for each resin under study, were used. Their spectra were outlined using FTIR Spectroscopy. Results: After performing the statistical analysis, it was possible to conclude that the variables "Resin" and "Time" significantly affect Microhardness. Regarding the conversion degree, a comparison of the spectra from various study groups was conducted, and this allowed the identification of specific wavenumbers confirming that the conversion process occurred after the resin polymerization process. Conclusions: The mechanical properties of resins, particularly the conversion degree and microhardness, are influenced by resin compositions and photopolymerization times.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Microdureza de Vickers Grau de conversão Microhíbrida Nanoparticulada