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Proceedings Paper

Organic dye penetration quantification into a dental composite resin cured by LED system using fluorescence spectroscopy
Author(s): Rosane de Fátima Zanirato Lizarelli; Maciel E. Silva; Emery C. C. C. Lins; Mardoqueu M. Costa; José Eduardo P. Pelino; Vanderlei S. Bagnato
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Paper Abstract

A major characteristic of LEDs systems is the lower heat emission related with the kind of light generation and spectral emission band. Material temperature during photoactivation can promote different photocuring performance. Organic dye penetration could be a trace to identify the efficacy of photocured composite resin. A new method using fluorescent spectroscopy through digital image evaluation was developed in this study. In order to understand if there is a real influence of material temperature during the photoactivation procedure of a dental restorative material, a hybrid composite resin (Z250, 3M-Espe, USA) and 3 light sources, halogen lamp (510 mW/cm2) and two LED systems 470±10nm (345 and 1000 mW/cm2) under different temperatures and intensities were used. One thousand and five hundred samples under different associations between light sources and temperatures (0, 25, 50, 75 and 100oC were tested and immediately kept in 6G rodamin dye solution. Dye penetration was evaluated through fluorescent spectroscopy recorded by digital image data. Pixels in gray scale showed the percentage penetration of organic dye into the composite resin mass. Time and temperature were statistically significant (p<0.05) through the ANOVA statistical test. The lowest penetration value was with 60 seconds and 25oC. Time and temperature are important factors to promote a homogeneous structure polymerized composite resin more than the light source type, halogen or LEDs system.

Paper Details

Date Published: 8 March 2007
PDF: 10 pages
Proc. SPIE 6425, Lasers in Dentistry XIII, 642510 (8 March 2007); doi: 10.1117/12.701461
Show Author Affiliations
Rosane de Fátima Zanirato Lizarelli, Univ. of São Paulo (Brazil)
Maciel E. Silva, Univ. of São Paulo (Brazil)
Emery C. C. C. Lins, Univ. of São Paulo (Brazil)
Mardoqueu M. Costa, Univ. of São Paulo (Brazil)
José Eduardo P. Pelino, Univ. de São Paulo (Brazil)
Vanderlei S. Bagnato, Univ. de São Paulo (Brazil)


Published in SPIE Proceedings Vol. 6425:
Lasers in Dentistry XIII
Peter Rechmann; Daniel Fried, Editor(s)

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