RELATIONSHIP BETWEEN THE DEGREE OF CONVERSION, SOLUBILITY AND SALIVARY SORPTION OF A HYBRID AND A NANOFILLED RESIN COMPOSITE: INFLUENCE OF THE LIGHT-ACTIVATION MODE
| Autor: | da Silva, Eduardo Moreira, Almeida, Giselle Soares, Poskus, Laiza Tatiana, Guimarães, José Guilherme Antunes |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Curing Lights
Dental Degree of conversion Time Factors Chemical Phenomena Surface Properties Temperature Composite resins Saliva Artificial Hydrogen-Ion Concentration Salivary sorption Radiation Dosage Spectrum Analysis Raman Phase Transition Absorption Nanocomposites Light-activation mode Dental Materials Solubility Materials Testing Spectroscopy Fourier Transform Infrared Humans Original Article Adsorption |
| Zdroj: | Journal of Applied Oral Science |
| ISSN: | 1678-7765 1678-7757 |
| Popis: | 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/cm(2) for 20 s) and Soft-start (SS; 100-1,000 mW/cm(2) for 10 s + 1,000 mW/cm(2) 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 (a = 0.05). The DC varied from 50.52% (nanofilled composite) to 57.15% (hybrid composite), and was influenced by the light-activation mode: CSS. The solubility (0.45 microg/mm(3)) and salivary sorption (8.04 microg/mm(3)) of the nanofilled composite were greater than those of the hybrid composite (0.40 microg/mm(3) / 6.87 microg/mm(3)), and were influenced by the light-activation mode: SSC. Correlation was found between DC and solubility (r = - 0.89, p0.05), 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. |
| Databáze: | OpenAIRE |
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