Influence of light intensity on contraction stress of flowable resins

Toshiki Takamizawa; Akira Yamamoto; Naoki Inoue; Akimasa Tsujimoto; Tatsuki Oto; Atsushi Irokawa; Keishi Tsubota; Masashi Miyazaki

doi:10.2334/josnusd.50.37

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Influence of light intensity on contraction stress of flowable resins

Journal article

Open access

Peer reviewed

Influence of light intensity on contraction stress of flowable resins

Toshiki Takamizawa, Akira Yamamoto, Naoki Inoue, Akimasa Tsujimoto, Tatsuki Oto, Atsushi Irokawa, Keishi Tsubota and Masashi Miyazaki

Journal of oral science, Vol.50(1), pp.37-43

03/2008

DOI: 10.2334/josnusd.50.37

PMID: 18403882

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https://doi.org/10.2334/josnusd.50.37View

Published (Version of record) Open Access

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 polymerization is influenced by power density and resin composite type.

Acrylic Resins - chemistry

Bisphenol A-Glycidyl Methacrylate - chemistry

Composite Resins - chemistry

Composite Resins - radiation effects

Dental Materials - chemistry

Dental Materials - radiation effects

Glass - chemistry

Humans

Light

Materials Testing

Microscopy, Electron, Scanning

Particle Size

Polymers - chemistry

Polymers - radiation effects

Polymethacrylic Acids - chemistry

Radiation Dosage

Silicon Dioxide - chemistry

Stress, Mechanical

Surface Properties

Tensile Strength

Viscosity

Details

Title: Subtitle: Influence of light intensity on contraction stress of flowable resins
Creators: Toshiki Takamizawa - Nihon University
Akira Yamamoto - Nihon University
Naoki Inoue - Nihon University
Akimasa Tsujimoto - Nihon University
Tatsuki Oto - Nihon University
Atsushi Irokawa - Nihon University
Keishi Tsubota - Nihon University
Masashi Miyazaki - Nihon University
Resource Type: Journal article
Publication Details: Journal of oral science, Vol.50(1), pp.37-43
DOI: 10.2334/josnusd.50.37
PMID: 18403882
ISSN: 1343-4934
eISSN: 1880-4926
Language: English
Date published: 03/2008
Academic Unit: Operative Dentistry
Record Identifier: 9984177255202771

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