| Dynamic monitoring of curing photoactive resins: a methods comparison. | |
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MedLine Citation:
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PMID: 20226516 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: The aim of this investigation was to determine reaction enthalpy, ion viscosity and curing light transmission changes of unfilled methacrylate-based systems in order to compare methods that monitor photoactive resin polymerization. METHODS: Photoinitiator (0.2%, w/v, camphoroquinone), accelerator (0.3%, w/v, amine) and inhibitor (ranging from 0 to 1%, w/v, butylated hydroxytoluene, BHT) were incorporated in an experimental BisGMA/TEGDMA co-monomer mixture (50/50, w/v). The concentration of BHT was varied from 0.00, 0.01, 0.05, 0.10, 0.50 to 1.00% (w/v). Light transmission (LT), reaction enthalpy (UV-differential scanning calorimetry, DSC), and ion viscosity (dielectrical analysis, DEA) were determined during irradiation of the resins (40s; halogen light curing-unit). Statistical analysis was performed using two-way ANOVA followed by post hoc tests (alpha=0.05). Curve fitting and regression calculation were done. RESULTS: There was no significant change in the time to reach the maximum rate of polymerization (reaction time) in the individual systems up to a BHT concentration of 0.05% (P>0.05). Starting at a concentration of 0.10% BHT an increase in time of reaction could be found from 4.0s (LT), 4.07s (DEA) and 4.9s (DSC) to a maximum of 7.4s (DSC), 9.43s (DEA) and 9.67s (LT). Linear increase (y=5.588 x x) in time to the maximum speed of reaction could be found with a correlation of R(2)=0.992. CONCLUSIONS: The speed of polymerization reaction is strongly influenced by BHT concentration. The linear relationship should allow for the prediction of the speed of reaction during blending of a methacrylate-based resin. The three test systems allow for monitoring the complex polymerization kinetics of unfilled methacrylate-based systems. |
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Authors:
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M Rosentritt; A C Shortall; W M Palin |
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Publication Detail:
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Type: Comparative Study; Journal Article Date: 2010-03-11 |
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 Jun |
Date Detail:
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Created Date: 2010-04-30 Completed Date: 2010-08-18 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: 565-70 Citation Subset: D |
Copyright Information:
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Copyright (c) 2010 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. |
Affiliation:
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Regensburg University Medical Center, Department of Prosthetic Dentistry, Franz Josef Strauss Allee 11, Regensburg, Germany. Martin.Rosentritt@klinik.uni-regensburg.de |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Bisphenol A-Glycidyl Methacrylate
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chemistry,
radiation effects Butylated Hydroxytoluene / chemistry, radiation effects Calorimetry, Differential Scanning Composite Resins / chemistry, radiation effects* Curing Lights, Dental Dental Materials / chemistry, radiation effects* Electrochemical Techniques Humans Light Methacrylates / chemistry, radiation effects* Photochemical Processes* Polyethylene Glycols / chemistry, radiation effects Polymers / chemistry, radiation effects Polymethacrylic Acids / chemistry, radiation effects Radiation Dosage Temperature Terpenes / chemistry, radiation effects Time Factors Viscosity |
| Chemical | |
Reg. No./Substance:
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0/Composite Resins; 0/Dental Materials; 0/Methacrylates; 0/Polyethylene Glycols; 0/Polymers; 0/Polymethacrylic Acids; 0/Terpenes; 109-16-0/triethylene glycol dimethacrylate; 128-37-0/Butylated Hydroxytoluene; 1565-94-2/Bisphenol A-Glycidyl Methacrylate; 465-29-2/camphoroquinone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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