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

Autor(es)

Vanessa Migliorini Urban ^[1] ; Ana Lucia Machado ^[2] ; Carlos Eduardo Vergani ^[3] ; Érica Gouveia Jorge ^[4] ; Luís Presley Serejo dos Santos ^[5] ; Edson Roberto Leite ^[6] ; Sebastião Vicente Canevarolo ^[7]

Afiliação do(s) autor(es)

^[1] São Paulo State University. Araraquara Dental School. Department of Dental Materials and Prosthodontics - Brasil

^[2] São Paulo State University. Araraquara Dental School. Department of Dental Materials and Prosthodontics - Brasil

^[3] São Paulo State University. Araraquara Dental School. Department of Dental Materials and Prosthodontics - Brasil

^[4] São Paulo State University. Araraquara Dental School. Department of Dental Materials and Prosthodontics - Brasil

^[5] São Carlos Federal University. Department of Chemistry. Interdisciplinary Laboratory of Eletrochemistry and Ceramics - Brasil

^[6] São Carlos Federal University. Department of Chemistry. Interdisciplinary Laboratory of Eletrochemistry and Ceramics - Brasil

^[7] São Carlos Federal University. Department of Material Engineering - Brasil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 10, n. 2, p. 191-197, 2007-06-00.

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. (AU)

• Processo FAPESP: 02/01405-0 - Análise da temperatura de transição vítrea e peso molecular de resinas acrílicas para reembasamento imediato: efeito de diferentes tratamentos térmicos
• Beneficiário: Carlos Eduardo Vergani
• Modalidade de apoio: Auxílio à Pesquisa - Regular