Effects of cement thickness and bonding on the failure loads of CAD/CAM ceramic crowns: Multi-physics FEA modeling and monotonic testing

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dc.contributor.authorMay, Liliana G. [UNESP]
dc.contributor.authorKelly, J. Robert
dc.contributor.authorBottino, Marco A. [UNESP]
dc.contributor.authorHill, Thomas
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv Connecticut
dc.contributor.institutionIvoclar Vivadent Inc
dc.date.accessioned2014-05-20T14:05:08Z
dc.date.available2014-05-20T14:05:08Z
dc.date.issued2012-08-01
dc.description.abstractObjective. To determine the influence of cement thickness and ceramic/cement bonding on stresses and failure of CAD/CAM crowns, using both multi-physics finite element analysis and monotonic testing.Methods. Axially symmetric FEA models were created for stress analysis of a stylized monolithic crown having resin cement thicknesses from 50 to 500 mu m under occlusal loading. Ceramic-cement interface was modeled as bonded or not-bonded (cement-dentin as bonded). Cement polymerization shrinkage was simulated as a thermal contraction. Loads necessary to reach stresses for radial cracking from the intaglio surface were calculated by FEA. Experimentally, feldspathic CAD/CAM crowns based on the FEA model were machined having different occlusal cementation spaces, etched and cemented to dentin analogs. Non-bonding of etched ceramic was achieved using a thin layer of poly(dimethylsiloxane). Crowns were loaded to failure at 5 N/s, with radial cracks detected acoustically.Results. Failure loads depended on the bonding condition and the cement thickness for both FEA and physical testing. Average fracture loads for bonded crowns were: 673.5 N at 50 mu m cement and 300.6 N at 500 mu m. FEA stresses due to polymerization shrinkage increased with the cement thickness overwhelming the protective effect of bonding, as was also seen experimentally. At 50 mu m cement thickness, bonded crowns withstood at least twice the load before failure than non-bonded crowns.Significance. Occlusal "fit" can have structural implications for CAD/CAM crowns; pre-cementation spaces around 50-100 mu m being recommended from this study. Bonding benefits were lost at thickness approaching 450-500 mu m due to polymerization shrinkage stresses. (C) 2012 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.en
dc.description.affiliationSão Paulo State Univ, Dept Dent Mat & Prosthodont, Sao Jose Dos Campos, SP, Brazil
dc.description.affiliationUniv Connecticut, Ctr Hlth, Farmington, CT USA
dc.description.affiliationIvoclar Vivadent Inc, Div Res, Amherst, NY USA
dc.description.affiliationUnespSão Paulo State Univ, Dept Dent Mat & Prosthodont, Sao Jose Dos Campos, SP, Brazil
dc.format.extentE99-E109
dc.identifierhttp://dx.doi.org/10.1016/j.dental.2012.04.033
dc.identifier.citationDental Materials. Oxford: Elsevier B.V., v. 28, n. 8, p. E99-E109, 2012.
dc.identifier.doi10.1016/j.dental.2012.04.033
dc.identifier.issn0109-5641
dc.identifier.lattes9234456003563666
dc.identifier.urihttp://hdl.handle.net/11449/22844
dc.identifier.wosWOS:000306485100001
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofDental Materials
dc.relation.ispartofjcr4.039
dc.relation.ispartofsjr2,106
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectCeramicsen
dc.subjectFailure testen
dc.subjectTensile stressen
dc.subjectResin cementen
dc.subjectCement thicknessen
dc.subjectBondingen
dc.subjectCement shrinkageen
dc.titleEffects of cement thickness and bonding on the failure loads of CAD/CAM ceramic crowns: Multi-physics FEA modeling and monotonic testingen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes9234456003563666
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Ciência e Tecnologia, São José dos Campospt

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