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Type: Artigo de periódico
Title: Improved polymerization efficiency of methacrylate-based cements containing an iodonium salt
Author: Goncalves, LS
Moraes, RR
Ogliari, FA
Boaro, L
Braga, RR
Consani, S
Abstract: Objective. This study evaluated the effect of adding diphenyliodonium hexafluorphosphate (DPI) as a third component of the free-radical photoinitiator system of model resin cements on their photopolymerization kinetics/stress and fundamental properties. Methods. A model resin cement containing a 1:1 mass ratio of 2,2-bis[4-(2-hydroxy-3-methacryloxypropoxy)phenyl]propane and triethyleneglycol dimethacrylate was obtained. Camphorquinone (1 mol%) and 2-(dimethylamino)ethyl methacrylate (2 mol%) were added to monomer blend. Six mixtures were obtained by incorporation of 0 (control), 0.25, 0.5, 1, 2, or 4 mol% of DPI. The cements were loaded with a 60% mass fraction of silanated glass fillers. Polymerization kinetics (using Fourier-transform near-infrared spectroscopy), flexural strength and modulus, water uptake/solubility, and polymerization stress were assessed. Data were statistically analyzed using one-way ANOVA and Student-Newman-Keuls' test (P <= 0.05). Results. In the DPI-modified materials, the onset of autodeceleration occurred earlier and at higher conversion compared with the control cement. The addition of DPI also led to a more active early-stage polymerization. The flexural modulus was generally higher for DPI-containing materials. Water uptake and solubility were generally lower for materials with DPI fractions >= 0.5%. Significant increase of polymerization stress was observed only in the group with 1 mol% of DPI compared with the control cement. Significance. The effect of DPI on the photopolymerization reactivity of the cement is concentration-dependent; the use of DPI could result in better polymerization efficiency of resin-based cements. (C) 2013 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
Subject: Light curing
Dental materials
Free-radical polymerization
Onium salt
Resin cements
Country: Inglaterra
Editor: Elsevier Sci Ltd
Citation: Dental Materials. Elsevier Sci Ltd, v. 29, n. 12, n. 1251, n. 1255, 2013.
Rights: fechado
Identifier DOI: 10.1016/
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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