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Type: Artigo de periódico
Title: Monomer conversion at different dental composite depths using six light-curing methods
Author: Obici, AC
Sinhoreti, MAC
Frollini, E
Correr-Sobrinho, L
de Goes, MF
Henriques, GEP
Abstract: This study used infrared spectroscopy to compare the degree of conversion (DC) of Z250 resin composite at different depths, using a variety of light-curing sources. Photo-activation was performed with: plasma arc (PAC) light, a blue light emitting diode (LED) and four different exposure scenarios using quartz-tungsten-halogen (QTH) light. Cured composite cylinders were transversally cut into 300 pm-thick slices corresponding to surface, 1-5 mm depths. Each disc was finely pulverized, incorporated into KBr pellets, and analyzed by FTIR. Results demonstrated that for the surface and depths of 1 and 2 min, conversion values did not differ significantly between lights or exposure treatments. At 3 and 4 mm depths, the LED source showed significantly higher DC than did the PAC light. All QTH methods were not significantly different to either LED or PAC. At 5 mm, there was no significant difference in DC between methods, except that PAC was not able to cure the composite. (C) 2006 Elsevier Ltd. All rights reserved.
Subject: composites
curing of polymers
degree of polymerization
Country: Inglaterra
Editor: Elsevier Sci Ltd
Citation: Polymer Testing. Elsevier Sci Ltd, v. 25, n. 3, n. 282, n. 288, 2006.
Rights: fechado
Identifier DOI: 10.1016/j.polymertesting.2006.01.006
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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