On the mechanical properties and microstructure of zirconia-reinforced feldspar-based porcelain

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dc.contributor.authorNascimento, Rubens Maribondo do
dc.contributor.authorSantos, Rafaela Luiz Pereira
dc.contributor.authorSilva, Filipe Samuel
dc.contributor.authorMotta, Fabiana Villela da
dc.contributor.authorHenriques, Bruno
dc.contributor.authorSouza, Júlio César Matias de
dc.date.accessioned2022-01-05T14:47:53Z
dc.date.available2022-01-05T14:47:53Z
dc.date.issued2016-09
dc.description.resumoThe aim of this study was to produce and to evaluate the mechanical properties of a dental feldspar-based porcelain reinforced by zirconia particles. The specimens were prepared by incorporating different volume fractions (10, 20, 30, 40 or 50%) of zirconia particles (3Y-TZP) in a porcelain matrix. The mixtures were hot pressed in vacuum at 970°C for 2 min. Flexural strength of the composites was measured using a three-point-bending test. Hardness, Young’s modulus and fracture toughness were also measured for all the composites. The microstructure and fracture surfaces were characterized by Field Emission Guns Scanning Electron Microscopy (FEG-SEM). Chemical analyses were performed by Energy Dispersive Spectroscopy (EDS) and X-Ray Diffraction (XRD). The highest flexural strength (218 ± 24 MPa) and fracture toughness (2.1 ± 0.1 MPa m 1/2) values were recorded for composites containing 30% zirconia particles. That corresponded to improvement in mechanical properties of about 2 times relative to those registered for feldspar-based porcelain. It was not noticed any significant difference in hardness values. The Young’s moduli also increased with the addition of zirconia particles. The addition of zirconia particles to porcelain improved significantly the mechanical properties of the base material. Zirconia-reinforced porcelain can constitute a promising alternative to conventional feldspar-based porcelains to produce prosthetic restorations, mainly for posterior teeth where high strength and toughness are demandedpt_BR
dc.identifier.citationSANTOS, Rafaela L. P.; SILVA, Filipe S.; NASCIMENTO, Rubens M.; MOTTA, Fabiana V.; SOUZA, Júlio C. M.; HENRIQUES, Bruno. On the mechanical properties and microstructure of zirconia-reinforced feldspar-based porcelain. Ceramics International, [S.L.], v. 42, n. 12, p. 14214-14221, set. 2016. Disponível em: https://www.sciencedirect.com/science/article/pii/S027288421630815X?via%3Dihub. Acesso em: 05 abr. 2021 http://dx.doi.org/10.1016/j.ceramint.2016.05.195.pt_BR
dc.identifier.doi10.1016/j.ceramint.2016.05.195
dc.identifier.issn0272-8842
dc.identifier.urihttps://repositorio.ufrn.br/handle/123456789/45571
dc.languageenpt_BR
dc.publisherElsevierpt_BR
dc.subjectFeldspar-based porcelainpt_BR
dc.subjectZirconiapt_BR
dc.subjectHot pressingpt_BR
dc.subjectCompositespt_BR
dc.subjectMechanical propertiespt_BR
dc.titleOn the mechanical properties and microstructure of zirconia-reinforced feldspar-based porcelainpt_BR
dc.typearticlept_BR

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