Effects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia system

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dc.contributor.authorFigueiredo, Viviane Maria Goncalves de [UNESP]
dc.contributor.authorBraga Pereira, Sauna Maciel [UNESP]
dc.contributor.authorBressiani, Eduardo [UNESP]
dc.contributor.authorValera, Marcia Carneiro [UNESP]
dc.contributor.authorBottino, Marco Antonio [UNESP]
dc.contributor.authorZhang, Yu
dc.contributor.authorMelo, Renata Marques de [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionNYU
dc.date.accessioned2018-11-26T17:41:58Z
dc.date.available2018-11-26T17:41:58Z
dc.date.issued2017-09-01
dc.description.abstractObjective: This study evaluated the influence of porcelain (VM9, VITA Zahnfabrik, Germany) thickness on the flexural strength and crack propagation in bilayered zirconia systems (YZ, VITA Zahnfabrik, Germany). Material and Methods: Thirty zirconia bars (20.0x4.0x1.0 mm) and six zirconia blocks (12.0x7.5x1.2 mm) were prepared and veneered with porcelain with different thickness: 1 mm, 2 mm, or 3 mm. The bars of each experimental group (n=10) were subjected to four-point flexural strength testing. In each ceramic block, a Vickers indentation was created under a load of 10 kgf for 10 seconds, for the propagation of cracks. Results: The results of flexural strength were evaluated by One-way ANOVA and Tukey's test, with a significance level of 5%. The factor thickness of the porcelain was statistically significant (p=0.001) and the 1-mm group presented the highest values of flexural strength. The cracks were predominant among the bending specimens with 1 and 2 mm of porcelain, and catastrophic failures were found in 50% of 3-mm-thick porcelain. After the indentation of blocks, the most severe defects were observed in blocks with 3-mm-thick porcelain. Conclusion: The smallest (1 mm) thickness of porcelain on the zirconia infrastructure presented higher values of flexural strength. Better resistance to defect propagation was observed near the porcelain/ zirconia interface for all groups. Higher flexural strength was found for a thinner porcelain layer in a bilayered zirconia system. The damage caused by a Vickers indentation near and far the interface with the zirconia shows that the stress profiles are different.en
dc.description.affiliationUniv Estadual Paulista, Inst Ciencia & Tecnol Sao Jose dos Campos, Dept Mat Odontol & Protese, Ave Engenheiro Francisco Jose Longo 777, BR-12245000 Sao Jose Dos Campos, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Ciencia & Tecnol Sao Jose dos Campos, Dept Odontol Restauradora, Sao Jose Dos Campos, SP, Brazil
dc.description.affiliationNYU, Coll Dent Biomat & Biomimet, New York, NY USA
dc.description.affiliationUnespUniv Estadual Paulista, Inst Ciencia & Tecnol Sao Jose dos Campos, Dept Mat Odontol & Protese, Ave Engenheiro Francisco Jose Longo 777, BR-12245000 Sao Jose Dos Campos, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Ciencia & Tecnol Sao Jose dos Campos, Dept Odontol Restauradora, Sao Jose Dos Campos, SP, Brazil
dc.description.sponsorshipUS National Institute of Dental and Craniofacial Research Grant
dc.description.sponsorshipIdUS National Institute of Dental and Craniofacial Research Grant: 2R01 DE017925
dc.format.extent566-574
dc.identifierhttp://dx.doi.org/10.1590/1678-7757-2015-0479
dc.identifier.citationJournal Of Applied Oral Science. Bauru-sp: Univ Sao Paulo Fac Odontologia Bauru, v. 25, n. 5, p. 566-574, 2017.
dc.identifier.doi10.1590/1678-7757-2015-0479
dc.identifier.fileS1678-77572017000500566.pdf
dc.identifier.issn1678-7757
dc.identifier.lattes9234456003563666
dc.identifier.scieloS1678-77572017000500566
dc.identifier.urihttp://hdl.handle.net/11449/163425
dc.identifier.wosWOS:000413737100013
dc.language.isoeng
dc.publisherUniv Sao Paulo Fac Odontologia Bauru
dc.relation.ispartofJournal Of Applied Oral Science
dc.relation.ispartofsjr0,645
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectCeramics
dc.subjectPorcelain
dc.subjectMechanical stress
dc.subjectConfocal microscopy
dc.titleEffects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia systemen
dc.typeArtigo
dcterms.rightsHolderUniv Sao Paulo Fac Odontologia Bauru
unesp.author.lattes9234456003563666
unesp.author.orcid0000-0003-0077-3161[5]

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Artigos - Materiais Odontológicos e Prótese - ICT
Artigos - Odontologia Restauradora - ICT