Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/63817
Type: Artigo de periódico
Title: Effect of co-initiator ratio on the polymer properties of experimental resin composites formulated with camphorquinone and phenyl-propanedione
Author: Schneider, LFJ
Cavalcante, LM
Consani, S
Ferracane, JL
Abstract: Objectives. To evaluate the effect of amine ratio (ethyl 4-dimethylaminobenzoate, EDMAB) on P the maximum rate of polymerization (R(p)(max)), degree of conversion (DC), Knoop hardness (KH), water sorption (Wsp), water solubility (Wsl) and color changes (Delta E) over time of resin composites formulated with the photoinitiators camphorquinone (CQ), phenylpropanedione (PPD) and CQ-PPD in combination. Materials and methods. Experimental resin composites were made with photoinitiator:amine ratios of 2:1, 1:1, 1:1.5 and 1:2 by weight, R(p)(max) was evaluated with differential scanning calorimetry (DSC), DC with DSC and Fourier transformed infrared (FTIR) spectroscopy, KH with Knoop indentation, Wsp and Wsl adapted from ISO 4049; and color with a chromameter. The results were analyzed with two-way ANOVAnlukey's multiple comparison test (p < 0.05). Results. The higher the amine ratio in the composite, the higher was DC, R(p)(max), and KH, P and the lower was Wsl, regardless of the photoinitiator type. The use of PPD alone resulted in poorer properties than CQ and CQ-PPD. Many factors seem to affect the color changes and the b-axis data revealed that the higher the amine ratio, the higher was the +b value (yellowing) for CQ and CQ-PPD formulations. Conclusions. Higher amine ratios led to improved polymer proper-ties, but also produced more yellowing in resin composites with CQ and CQ-PPD. The use of PPD alone was not advantageous for producing good final properties when compared to CQ and CQ-PPD. (C) 2008 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
Subject: Amine
Camphorquinone
Degree of conversion
Phenyl-propanedione
Polymerization
Resin composite
Country: Inglaterra
Editor: Elsevier Sci Ltd
Rights: fechado
Identifier DOI: 10.1016/j.dental.2008.08.003
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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