Microstructure characterization and SCG of newly engineered dental ceramics

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dc.contributor.authorRamos, Nathália De Carvalho [UNESP]
dc.contributor.authorCampos, Tiago Moreira Bastos
dc.contributor.authorPaz, Igor Siqueira De La [UNESP]
dc.contributor.authorMacHado, João Paulo Barros
dc.contributor.authorBottino, Marco Antonio [UNESP]
dc.contributor.authorCesar, Paulo Francisco
dc.contributor.authorDe Melo, Renata Marques [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionAeronautics Technological Institute (ITA)
dc.contributor.institutionLaboratory of Sensors and Materials
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2018-12-11T17:29:08Z
dc.date.available2018-12-11T17:29:08Z
dc.date.issued2016-07-01
dc.description.abstractObjectives The aim of this study was to characterize the microstructure of four dental CAD-CAM ceramics and evaluate their susceptibility to stress corrosion. Methods SEM and EDS were performed for microstructural characterization. For evaluation of the pattern of crystallization of the ceramics and the molecular composition, XRD and FTIR, respectively, were used. Elastic modulus, Poisson's ratio, density and fracture toughness were also measured. The specimens were subjected to biaxial flexure under five stress rates (0.006, 0.06, 0.6, 6 and 60 MPa/s) to determine the subcritical crack growth parameters (n and D). Twenty-five specimens were further tested in mineral oil for determination of Weibull parameters. Two hundred forty ceramic discs (12 mm diameter and 1.2 mm thick) were made from four ceramics: feldspathic ceramic - FEL (Vita Mark II, Vita Zahnfabrik), ceramic-infiltrated polymer - PIC (Vita Enamic, Vita Zahnfabrik), lithium disilicate - LD (IPS e.max CAD, Ivoclar Vivadent) and zirconia-reinforced lithium silicate - LS (Vita Suprinity, Vita Zahnfabrik). Results PIC discs presented organic and inorganic phases (n = 29.1 ± 7.7) and Weibull modulus (m) of 8.96. The FEL discs showed n = 36.6 ± 6.8 and m = 8.02. The LD discs showed a structure with needle-like disilicate grains in a glassy matrix and had the lowest value of n (8.4 ± 0.8) and m = 6.19. The ZLS discs showed similar rod-like grains, n = 11.2 ± 1.4 and m = 9.98. Significance The FEL and PIC discs showed the lowest susceptibility to slow crack growth (SCG), whereas the LD and ZLS discs presented the highest. PIC presented the lowest elastic modulus and no crystals in its composition, while ZLS presented tetragonal zirconia. The overall strength and SCG of the new materials did not benefit from the additional phase or microconstituents present in them.en
dc.description.affiliationDepartment of Dental Materials and Prosthodontics São Paulo State University (UNESP) Institute of Science and Technology, 777 Eng. Francisco José Longo Avenue
dc.description.affiliationAeronautics Technological Institute (ITA), 50 Praça Marechal Eduardo Gomes
dc.description.affiliationNational Institute for Space Research Laboratory of Sensors and Materials, 1758 Astronautas Avenue
dc.description.affiliationUniversity of São Paulo (USP) School of Dentistry Department of Biomaterials and Oral Biology, 2227 Prof. Lineu Prestes Avenue
dc.description.affiliationUnespDepartment of Dental Materials and Prosthodontics São Paulo State University (UNESP) Institute of Science and Technology, 777 Eng. Francisco José Longo Avenue
dc.format.extent870-878
dc.identifierhttp://dx.doi.org/10.1016/j.dental.2016.03.018
dc.identifier.citationDental Materials, v. 32, n. 7, p. 870-878, 2016.
dc.identifier.doi10.1016/j.dental.2016.03.018
dc.identifier.file2-s2.0-84979493131.pdf
dc.identifier.issn0109-5641
dc.identifier.lattes9234456003563666
dc.identifier.scopus2-s2.0-84979493131
dc.identifier.urihttp://hdl.handle.net/11449/178171
dc.language.isoeng
dc.relation.ispartofDental Materials
dc.relation.ispartofsjr2,106
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectCeramics
dc.subjectComputer-aided design
dc.subjectDental porcelain
dc.subjectFlexural strength
dc.subjectGlass ceramics
dc.subjectSpectroscopy
dc.subjectStress corrosion
dc.subjectSubcritical crack growth
dc.subjectYoung's modulus
dc.titleMicrostructure characterization and SCG of newly engineered dental ceramicsen
dc.typeArtigo
unesp.advisor.lattes9234456003563666
unesp.author.orcid0000-0003-0449-686X[7]

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