Desenvolvimento de materiais resinosos para infiltração em lesões cariosas incipientes em esmalte : avaliação do grau de conversão, densidade de ligações cruzadas e módulo de elasticidade / Development of resin materials in incipient enamel caries infiltration : evaluation of the degree of conversion, cross-linking density and elastic modulus

AUTOR(ES)

Giovana Spagnolo Albamonte de Araújo

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

22/02/2011

RESUMO

The aim of this study was to evaluate the degree of conversion, crosslink density and elastic modulus of nine experimental resin materials containing different combinations of base monomers and solvents on comparison to a material commercially available. Moreover, to evaluate the elastic modulus after application to artificially carious enamel. Were prepared nine experimental resin materials containing TEGDMA, BISEMA, HEMA, UDMA and ethanol in different proportions. The degree of conversion was measured by Fourier Transformed Infrared Spectroscopy (FTIR). The crosslink density was indirectly assessed by the rate of reduction of hardness after immersion in ethanol. The elastic modulus of was evaluated by three-point bending test to evaluate the elastic modulus, using a universal testing machine (Instron). Additionally, the elastic modulus of enamel caries and infiltrated with the experimental materials was evaluated. For that, bovine enamel blocks with 4mm x 2mm x 1mm were prepared and submitted to the development of caries. The experimental resin materials were applied and the elastic modulus was determined by three-point bending test in a universal testing machine (Instron). The results were subjected to two types of analysis, the first ANOVA and Tukey test (5%), in which a comparison is made between the experimental groups. The second analysis, data were analyzed by ANOVA and Dunnett s test (5%), in which a comparison is made between the control and experimental groups. The materials in the composition containing ethanol exhibited inferior in all tests, and the solvent-free composition showed the best results. The addition of UDMA not influence the properties tested, but the manner influenced BisEMA negativa.O resinous material containing commercial and TEGDMA showed the highest degree of conversion compared to the other groups. Regarding the crosslink density, a greater reduction of hardness of the group containing TEGDMA, UDMA and ethanol compared with the control group (commercial). The groups containing ethanol showed the lowest elastic modulus, being different from the control group. Regarding the elasticity of the samples infiltrated decayed and there was no significant difference between groups infiltrated and control group (decayed) or between experimental groups. The addition of ethanol, and HEMA influenced negatively all properties tested as the TEGDMA monomer base, without addition of solvent appeared as infiltrating the best properties in all tests.

ASSUNTO(S)

cárie dentária resinas dental caries resins

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