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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 7
Affiliation:
[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
Total Affiliations: 7
Document type: Journal article
Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 10, n. 2, p. 191-197, 2007-06-00.
Abstract

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)