Degree of conversion and molecular weight of one denture base and three reline resins submitted to post-polymerization treatments
AUTOR(ES)
Urban, Vanessa Migliorini, Machado, Ana Lucia, Vergani, Carlos Eduardo, Jorge, Érica Gouveia, Santos, Luís Presley Serejo dos, Leite, Edson Roberto, Canevarolo, Sebastião Vicente
FONTE
Materials Research
DATA DE PUBLICAÇÃO
2007-06
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 10(5) to 6.5 x 10(5) 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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