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- W2484540229 abstract "The aim of the study was to evaluate post-polymerization of resin composite by measuring NanoHardness (H), Young's Modulus (E) and Degree of Conversion (DC) using nanoindentation and Micro-Raman spectroscopy. For this purpose a computer-controlled NanoIndenter™ and a Renishaw 1000 Raman Spectrometer fitted with an Olympus microscope attachment, operated at 638 nm, were used. A light-activated resin composite was used in this study, (Z250, 3MESPE). Sub-groups (n=3) of specimens were irradiated for 20, 30, 40 s. All samples for nanoindentation were polished metallographically and typically 50 nano- indentations were performed per specimen. After curing and polishing, half of the samples were tested immediately (Group 1); the others after being stored dry at 37 °C for 7 days (Group 2) to allow scope for post- polymerization. H values ranged from 1.08 to 1.40 GPa for Group 1, and from 1.64 to1.71 GPa for Group 2. E values in Group 1 ranged from 19.60 to 19.94 GPa and for Group 2, from 21.42 to 22.05 GPa. DC values ranged from 55 to 66.39%, and 60.90 to 66.47% for Group 1 and Group 2 respectively. All values obtained shown significant different between Groups 1 and 2 (p<0.05); ie as a result of any (further) monomer post- polymerization. The consistently greater H, E and DC values in Group 2 suggest that network stabilization may occur partly by mechanisms supplementary to monomer conversion per se. This could include annealing of the polymer chain segments." @default.
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- W2484540229 date "2007-01-01" @default.
- W2484540229 modified "2023-09-24" @default.
- W2484540229 title "Post-polymerization of dental resin composite evaluated with nanoindentation and micro- Raman spectroscopy" @default.
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