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1.
J. appl. oral sci ; 16(2): 161-166, Mar.-Apr. 2008. graf
Artigo em Inglês | LILACS, BBO | ID: biblio-873412

RESUMO

This study analyzed the relationship between the degree of conversion (DC), solubility, and salivary sorption of a hybrid (Filtek P 60) and a nanofilled resin composite (Filtek Supreme), and evaluated the influence of the light-activation mode on these properties. Two light-activation modes were used: Conventional (C; 850 mW/cm2 for 20 s) and Soft-start (SS; 100-1,000 mW/cm2 for 10 s + 1,000 mW/cm2 for 10 s). The DC (%) was evaluated by FT-Raman spectroscopy. The solubility and salivary sorption were measured after immersion in artificial saliva for 7 days. Data were analyzed by ANOVA and Student-Newman- Keuls’ test and linear regression analysis (= 0.05). The DC varied from 50.52% (nanofilled composite) to 57.15% (hybrid composite), and was influenced by the light-activation mode: C > SS. The solubility (0.45 µg/mm3) and salivary sorption (8.04 µg/mm3) of the nanofilled composite were greater than those of the hybrid composite (0.40 µg/mm3 / 6.87 µg/mm3), and were influenced by the light-activation mode: SS > C. Correlation was found between DC and solubility (r = - 0.89, p<0.05), as well as between solubility and salivary sorption (r = 0.95). These findings suggest that nanofilled composites may present higher degradation in the oral environment than hybrid ones. Soft-start light-activation mode may increase the solubility of resin composites.


Assuntos
Resinas Compostas , Resinas Compostas/análise , Saliva , Materiais Dentários , Solubilidade
2.
J. appl. oral sci ; 16(2): 161-166, Mar.-Apr. 2008. graf, tab
Artigo em Inglês | LILACS | ID: lil-479764

RESUMO

This study analyzed the relationship between the degree of conversion (DC), solubility, and salivary sorption of a hybrid (Filtek P 60) and a nanofilled resin composite (Filtek Supreme), and evaluated the influence of the light-activation mode on these properties. Two light-activation modes were used: Conventional (C; 850 mW/cm² for 20 s) and Soft-start (SS; 100-1,000 mW/cm² for 10 s + 1,000 mW/cm² for 10 s). The DC ( percent) was evaluated by FT-Raman spectroscopy. The solubility and salivary sorption were measured after immersion in artificial saliva for 7 days. Data were analyzed by ANOVA and Student-Newman-Keuls' test and linear regression analysis (a = 0.05). The DC varied from 50.52 percent (nanofilled composite) to 57.15 percent (hybrid composite), and was influenced by the light-activation mode: C > SS. The solubility (0.45 mg/mm³) and salivary sorption (8.04 mg/mm³) of the nanofilled composite were greater than those of the hybrid composite (0.40 mg/mm³ / 6.87 mg/mm³), and were influenced by the light-activation mode: SS > C. Correlation was found between DC and solubility (r = - 0.89, p<0.05), as well as between solubility and salivary sorption (r = 0.95). These findings suggest that nanofilled composites may present higher degradation in the oral environment than hybrid ones. Soft-start light-activation mode may increase the solubility of resin composites.


Assuntos
Humanos , Resinas Compostas/química , Materiais Dentários/química , Nanocompostos/química , Saliva Artificial/química , Absorção , Adsorção , Fenômenos Químicos , Lâmpadas de Polimerização Dentária , Concentração de Íons de Hidrogênio , Teste de Materiais , Transição de Fase , Doses de Radiação , Solubilidade , Espectroscopia de Infravermelho com Transformada de Fourier , Análise Espectral Raman , Propriedades de Superfície , Temperatura , Fatores de Tempo
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