| A dynamic light scattering approach for monitoring dental composite curing kinetics. | |
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MedLine Citation:
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PMID: 20378159 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVES: The purpose of this study was to develop and evaluate a dynamic light scattering-based method for monitoring the polymerization reaction of a light activated dental composite. METHODS: Laser light back-scattered from thin disk-shaped composite samples was used to study the curing reaction kinetics. Samples were irradiated simultaneously on opposite surfaces with a 633 nm laser beam and a halogen curing lamp (320, 160, or 100 mW/cm(2)). Dynamic laser speckle patterns were imaged onto a CCD camera at a rate of 32 frames/s for 2 min. The intensity decorrelation rate calculated from sequential speckle patterns was used to assess the rate of motion within the samples during the reaction. RESULTS: Motion within the composite increased immediately upon the onset of light exposure for all trials. This was followed by a brief period characterized by a relatively constant high rate of motion. Finally the rate of motion decreased exponentially. The reaction acceleration, deceleration, and maximum rate were dependent upon the irradiance of the curing light source. SIGNIFICANCE: This method monitors reaction rate and the change in reaction rate at high temporal resolution without contact. Reaction kinetics was shown to begin immediately after light exposure suggesting limited opportunity for viscous flow and stress relief. |
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Authors:
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Elaine M Wells-Gray; Sean J Kirkpatrick; Ronald L Sakaguchi |
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Publication Detail:
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Type: Journal Article Date: 2010-04-07 |
Journal Detail:
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Title: Dental materials : official publication of the Academy of Dental Materials Volume: 26 ISSN: 1879-0097 ISO Abbreviation: Dent Mater Publication Date: 2010 Jul |
Date Detail:
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Created Date: 2010-05-31 Completed Date: 2010-09-22 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8508040 Medline TA: Dent Mater Country: England |
Other Details:
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Languages: eng Pagination: 634-42 Citation Subset: D |
Copyright Information:
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Copyright 2010 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. |
Affiliation:
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Division of Biomedical Engineering, Department of Science and Engineering, Oregon Health & Science University, Portland, OR, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Bisphenol A-Glycidyl Methacrylate
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chemistry Composite Resins / chemistry*, radiation effects* Dental Bonding, Light-Cured* Kinetics Lasers Optical Phenomena Phase Transition Photography Polyethylene Glycols / chemistry Polymethacrylic Acids / chemistry Scattering, Radiation |
| Chemical | |
Reg. No./Substance:
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0/Composite Resins; 0/Polyethylene Glycols; 0/Polymethacrylic Acids; 109-16-0/triethylene glycol dimethacrylate; 1565-94-2/Bisphenol A-Glycidyl Methacrylate |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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