Degree of conversion and molecular weight of one denture base and three reline resins submitted post-polymerization treatments

• Autor(a) principal: Urban, Vanessa Migliorini [UNESP]
• Data de Publicação: 2007
• Outros Autores: Machado, Ana Lucia [UNESP], Vergani, Carlos Eduardo [UNESP], Jorge, Érica Gouveia [UNESP], dos Santos, Luís Presley Serejo, Leite, Edson Roberto, Canevarolo, Sebastião Vicente
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/S1516-14392007000200016; http://hdl.handle.net/11449/69604
• topic: Degree of conversion; Molecular weight; Post-polymerization treatment; Reline resin; Microwave irradiation; Polymerization; Resins; Kruskal-Wallis test; Reline resins; Dental prostheses

The effect of post-polymerization treatments (MW-microwave irradiatron 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 (α = .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 × 105 to 6.5 × 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.