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Article: A light curing method for improving marginal sealing and cavity wall adaptation of resin composite restorations

TitleA light curing method for improving marginal sealing and cavity wall adaptation of resin composite restorations
Authors
KeywordsChemicals And Cas Registry Numbers
Issue Date2001
PublisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental
Citation
Dental Materials, 2001, v. 17 n. 4, p. 359-366 How to Cite?
AbstractObjective: The aim of this study was to evaluate whether the method of light curing could influence: (a) marginal sealing and resin composite adaptation to the cavity wall; (b) polymerization contraction rate; and (c) the hardness at the top and bottom surfaces of a body of resin composite. Methods: Standard cylindrical cavities, 1 mm deep and 3 mm in diameter were prepared on flat superficial dentin surfaces in bovine teeth. The teeth were bonded with one of two adhesive systems (Clearfil Photo Bond, and Super-Bond D Liner) and filled with a hybrid resin composite. The resins were cured using three light intensities of 600, 270 and 20 mW/cm2, and various curing times. After thermal cycling, the specimens were subjected to a dye penetration test to evaluate marginal sealing and adaptation of the resin composite to the cavity walls. In addition, using the same curing conditions, the rate of polymerization contraction was measured. The difference of hardness over time of composite specimens was measured using Knoop hardness measurements taken at the top and bottom surfaces of resin specimens made in a Teflon mold the same dimensions as the cavity prepared in dentin. Results:When the composite was light cured with an initial light intensity of 270 mW/cm2 for 10 s, a 5 s interval then a light intensity of 600 mW/cm2 for 50 s, the best marginal sealing and cavity wall adaptation was observed compared with the other curing modes. Earlier hardening occurred at the resin composite base compared with the top surface of the composite, and most of the polymerization contraction was completed during the initial flowable stage of the resin composite. All other methods demonstrated results with some degree of marginal opening and cavity wall gap formation, the worst being 600 mW/s for 60 s. Significance: The use of a low initial light intensity (270 mW/cm2) for 10 s followed by high intensity light (600 mW/cm2) for 50 s provides the best adaptation of resin composite to cavity walls and possibly the least polymerization contraction stress. © 2001 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/90728
ISSN
2015 Impact Factor: 3.931
2015 SCImago Journal Rankings: 1.339
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorYoshikawa, Ten_HK
dc.contributor.authorBurrow, MFen_HK
dc.contributor.authorTagami, Jen_HK
dc.date.accessioned2010-09-17T10:07:24Z-
dc.date.available2010-09-17T10:07:24Z-
dc.date.issued2001en_HK
dc.identifier.citationDental Materials, 2001, v. 17 n. 4, p. 359-366en_HK
dc.identifier.issn0109-5641en_HK
dc.identifier.urihttp://hdl.handle.net/10722/90728-
dc.description.abstractObjective: The aim of this study was to evaluate whether the method of light curing could influence: (a) marginal sealing and resin composite adaptation to the cavity wall; (b) polymerization contraction rate; and (c) the hardness at the top and bottom surfaces of a body of resin composite. Methods: Standard cylindrical cavities, 1 mm deep and 3 mm in diameter were prepared on flat superficial dentin surfaces in bovine teeth. The teeth were bonded with one of two adhesive systems (Clearfil Photo Bond, and Super-Bond D Liner) and filled with a hybrid resin composite. The resins were cured using three light intensities of 600, 270 and 20 mW/cm2, and various curing times. After thermal cycling, the specimens were subjected to a dye penetration test to evaluate marginal sealing and adaptation of the resin composite to the cavity walls. In addition, using the same curing conditions, the rate of polymerization contraction was measured. The difference of hardness over time of composite specimens was measured using Knoop hardness measurements taken at the top and bottom surfaces of resin specimens made in a Teflon mold the same dimensions as the cavity prepared in dentin. Results:When the composite was light cured with an initial light intensity of 270 mW/cm2 for 10 s, a 5 s interval then a light intensity of 600 mW/cm2 for 50 s, the best marginal sealing and cavity wall adaptation was observed compared with the other curing modes. Earlier hardening occurred at the resin composite base compared with the top surface of the composite, and most of the polymerization contraction was completed during the initial flowable stage of the resin composite. All other methods demonstrated results with some degree of marginal opening and cavity wall gap formation, the worst being 600 mW/s for 60 s. Significance: The use of a low initial light intensity (270 mW/cm2) for 10 s followed by high intensity light (600 mW/cm2) for 50 s provides the best adaptation of resin composite to cavity walls and possibly the least polymerization contraction stress. © 2001 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dentalen_HK
dc.relation.ispartofDental Materialsen_HK
dc.subjectChemicals And Cas Registry Numbersen_HK
dc.subject.meshAnalysis of Varianceen_HK
dc.subject.meshAnimalsen_HK
dc.subject.meshCattleen_HK
dc.subject.meshColoring Agents - diagnostic useen_HK
dc.subject.meshComposite Resins - chemistryen_HK
dc.subject.meshDental Bonding - methodsen_HK
dc.subject.meshDental Cavity Liningen_HK
dc.subject.meshDental Cavity Preparationen_HK
dc.subject.meshDental Leakage - classificationen_HK
dc.subject.meshDental Marginal Adaptationen_HK
dc.subject.meshDental Restoration, Permanenten_HK
dc.subject.meshDentin - ultrastructureen_HK
dc.subject.meshDentin-Bonding Agents - chemistryen_HK
dc.subject.meshHardnessen_HK
dc.subject.meshLighten_HK
dc.subject.meshMethacrylates - chemistryen_HK
dc.subject.meshPolymers - chemistryen_HK
dc.subject.meshResin Cements - chemistryen_HK
dc.subject.meshStatistics as Topicen_HK
dc.subject.meshStatistics, Nonparametricen_HK
dc.subject.meshSurface Propertiesen_HK
dc.subject.meshThermodynamicsen_HK
dc.subject.meshTime Factorsen_HK
dc.titleA light curing method for improving marginal sealing and cavity wall adaptation of resin composite restorationsen_HK
dc.typeArticleen_HK
dc.identifier.emailBurrow, MF:mfburr58@hku.hken_HK
dc.identifier.authorityBurrow, MF=rp01306en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0109-5641(00)00095-6en_HK
dc.identifier.pmid11356214en_HK
dc.identifier.scopuseid_2-s2.0-0035405803en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0035405803&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume17en_HK
dc.identifier.issue4en_HK
dc.identifier.spage359en_HK
dc.identifier.epage366en_HK
dc.identifier.isiWOS:000169290700012-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridYoshikawa, T=7402717952en_HK
dc.identifier.scopusauthoridBurrow, MF=7005876730en_HK
dc.identifier.scopusauthoridTagami, J=7005967527en_HK

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