| Influence of light-curing protocols on polymerization shrinkage and shrinkage force of a dual-cured core build-up resin composite. | |
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MedLine Citation:
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PMID: 20662918 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study investigated the influence of time delay and duration of photo-activation on linear polymerization shrinkage, shrinkage force, and hardening of a dual-cured core build-up resin composite. The test material (Rebilda DC) was light-cured for 20 or 60 s either early (2 min) or late (7 min) after the start of mixing. Non-irradiated self-cured specimens served as controls. Linear shrinkage and shrinkage force were measured for 60 min using custom-made devices. Knoop hardness was determined at the end of the observation period. Self-cured controls, showing a linear shrinkage similar to that of specimens early light-cured for 20 s generated the lowest shrinkage force and hardness. A shorter light exposure time (20 s vs. 60 s) reduced linear shrinkage, shrinkage force, and hardness when early light-curing was performed, but did not affect the three properties in specimens light-cured late after the start of mixing. Late photo-activation increased linear shrinkage, irrespective of irradiation time, and resulted in a higher shrinkage force and hardness for short light exposure time. A moderate correlation was found between the two shrinkage properties studied (r(2) = 0.65). In conclusion, improvements in shrinkage behavior of the tested core build-up material were associated with inferior hardening, making it important to adapt curing protocols to the clinical situation. |
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Authors:
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Tobias T Tauböck; Tissiana Bortolotto; Wolfgang Buchalla; Thomas Attin; Ivo Krejci |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: European journal of oral sciences Volume: 118 ISSN: 1600-0722 ISO Abbreviation: Eur. J. Oral Sci. Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-07-28 Completed Date: 2010-12-08 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9504563 Medline TA: Eur J Oral Sci Country: Denmark |
Other Details:
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Languages: eng Pagination: 423-9 Citation Subset: D; IM |
Affiliation:
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Department of Preventive Dentistry, Periodontology and Cariology, University of Zurich, Zurich, Switzerland. tobias.tauboeck@zzmk.uzh.ch |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Bisphenol A-Glycidyl Methacrylate
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chemistry,
radiation effects Composite Resins / chemistry, radiation effects* Curing Lights, Dental / classification* Dental Materials / chemistry, radiation effects* Dentin-Bonding Agents / chemistry, radiation effects Hardness Humans Methacrylates / chemistry, radiation effects Photochemical Processes Polymers / chemistry Polymethacrylic Acids / chemistry, radiation effects Polyurethanes / chemistry, radiation effects Self-Curing of Dental Resins / methods* Stress, Mechanical Surface Properties Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Composite Resins; 0/Dental Materials; 0/Dentin-Bonding Agents; 0/Methacrylates; 0/Polymers; 0/Polymethacrylic Acids; 0/Polyurethanes; 0/rebilda DC; 121150-60-5/1,12-dodecanediol dimethacrylate; 125523-74-2/urethane dimethacrylate luting resin; 1565-94-2/Bisphenol A-Glycidyl Methacrylate |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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