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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/16352
Tipo: Artigo de Periódico
Título: Vicker’s hardness and Raman spectroscopy evaluation of a dental composite cured by an argon laser and a halogen lamp
Título(s) alternativo(s): Journal of Biomedical Optics
Autor(es): Soares, Luís Eduardo Silva
Martin, Airton Abrahão
Pinheiro, Antonio Luiz Barbosa
Pacheco, Marcos Tadeu Tavares
Autor(es): Soares, Luís Eduardo Silva
Martin, Airton Abrahão
Pinheiro, Antonio Luiz Barbosa
Pacheco, Marcos Tadeu Tavares
Abstract: We present the results of the Vicker’s hardness test and the use of near-infrared Raman spectroscopy (RS) to measure in vitro the degree of conversion (DC) of a bis(phenol)-A-glycidyl-dimethacrylate-based composite resin, photoactivated by both a halogen lamp (power density=478 mW/cm2; 8-mm diameter spot) and an argon laser (power density=625 mW/cm2; 7-mm diameter spot). The degree of conversion was estimated by analyzing the relative intensities between the aromatic CC stretching Raman mode at 1610 cm−1 and the methacrylate CC stretching Raman mode (1640 cm−1) on top and bottom surfaces. For the hardness evaluation, the samples were embedded in polyester resin and three indentations with a 50-g load for 10 s were made on the top surface. The higher relative DC values achieved by the photoactivation of a composite resin by the argon laser suggest a better biocompatibility in the bottom surface. The correlation test showed that the higher Vicker’s hardness number (VHN) values were associated with higher DC values. The derivative analysis showed a greater curing rate from 5 to 20 s of exposure. The comparison of VHN and DC values with both light sources at each curing time showed that a small change in conversion is related to a large change in hardness. Raman spectroscopy is more sensitive to changes in the first stages of curing reaction than later ones, and the Vicker’s hardness assay is more sensitive to changes in the last stages.
Palavras-chave: Vicker’s hardness
Raman spectroscopy
Degree of conversion
Photoactivation
Resin restoration
País: Brasil
Tipo de Acesso: Acesso Aberto
URI: http://repositorio.ufba.br/ri/handle/ri/16352
Data do documento: 2003
Aparece nas coleções:Artigo Publicado em Periódico (Faculdade de Odontologia)

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