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Artigo Científico | Polimerização | Inglês | 10/04/2007
Autores: Ana Lucia Machado, Carlos Eduardo Vergani, Edson R. Leite, Érica Gouveia Jorge, Luís Presley Serejo dos Santos, Sebastião V. Canevarolo, Vanessa Migliorini Urban
Palavras-chave: degree of conversion, molecular weight, post-polymerization treatment, reline resin
Resumo: The effect of post-polymerization treatments (MW-microwave irradiation and WB-water-bath) on the degree of conversion (DC) of three reline resins (Ufi Gel hard-U, Kooliner-K, and Tokuso Rebase Fast-T) and one denture base resin (Lucitone 550-L), submitted to two polymerization cycles (LS-short and LL-long), was evaluated by using FT-Raman spectroscopy (n = 5). The molecular weight (Mw) of the powder of all materials and of K polymerized specimens (control; MW; and WB; n = 3) was analyzed using GPC. DC data were analyzed using Kruskal-Wallis test (a = .05). For control specimens, there were no significant differences between U (68%) and LL (77%) and among LL, K (81%), and T (84%). LS (92%) had the highest DC (P < 0.05). Only material K exhibited an increased DC after WB (P < 0.05). All powders had Mw from 4.0 x 105 to 6.5 x 105 and narrow Mw distributions (2.1 to 3.6). Polymerization and post-polymerization produced K specimens with Mw similar to that of K powder.
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