Journal
DENTAL MATERIALS
Volume 29, Issue 12, Pages 1251-1255Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dental.2013.09.010
Keywords
Light curing; Dental materials; Free-radical polymerization; Onium salt; Resin cements
Funding
- FAPESP/Brazil [2007/06149-5]
- CNPq/Brazil [142119/2008-3]
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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.
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