PMID: 18403882Apr 12, 2008Paper

Influence of light intensity on contraction stress of flowable resins

Journal of Oral Science
Toshiki TakamizawaMasashi Miyazaki

Abstract

The purpose of this study was to evaluate the influence of power density on contraction stress of resin composite restorative materials during photo-polymerization. Six flowable resin composites, and a hybrid resin composite for comparison, were used. The composites were polymerized with the power density adjusted to either 100 or 600 mW/cm(2). Stress development was determined with a custom-made tensilometer. The adhesive was placed in a thin layer on a steel rod and resin paste was packed into the mold. The contraction force (N) generated during polymerization was continuously recorded and the maximum contraction stress (MPa) was calculated. Data were analyzed statistically. When the power density was adjusted to 100 mW/cm(2), the average contraction stress ranged from 0.30 to 0.50 MPa for the flowable composites, compared with 0.35 MPa for the hybrid composite. When the power density was adjusted to 600 mW/cm(2), the average contraction stress ranged from 0.34 to 1.00 MPa for the flowable composites and 0.69 MPa for the hybrid composite comparison. For all materials tested except Estelite Flow Quick, contraction stress increased with higher power density. The present results indicate that contraction stress during polymeriza...Continue Reading

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Oct 6, 2010·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Marcos Aurélio Bomfim da SilvaJosé Ivo Limeira Dos Reis
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May 4, 2013·Acta Odontologica Scandinavica·Natsu SuminoMark A Latta
Apr 25, 2018·Microscopy Research and Technique·Monika OstapiukAnna Mróz

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