Mechanical behavior and microstructural characterization of different zirconia polycrystals in different thicknesses

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dc.contributor.authorArcila, Laura Viviana Calvache [UNESP]
dc.contributor.authorde Carvalho Ramos, Nathália [UNESP]
dc.contributor.authorCampos, Tiago Moreira Bastos
dc.contributor.authorDapieve, Kiara Serafini
dc.contributor.authorValandro, Luiz Felipe
dc.contributor.authorde Melo, Renata Marques [UNESP]
dc.contributor.authorBottino, Marco Antonio [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversity of Taubaté (Unitau)
dc.contributor.institutionPhysics department
dc.contributor.institutionUniversidade Federal de Sergipe (UFS)
dc.date.accessioned2022-05-01T12:56:29Z
dc.date.available2022-05-01T12:56:29Z
dc.date.issued2021-01-01
dc.description.abstractPURPOSE. To characterize the microstructure of three yttria partially stabilized zirconia ceramics and to compare their hardness, indentation fracture resistance (IFR), biaxial flexural strength (BFS), and fatigue flexural strength. MATERIALS AND METHODS. Disc-shaped specimens were obtained from 3Y-TZP (Vita YZ HT), 4Y-PSZ (Vita YZ ST) and 5Y-PSZ (Vita YZ XT), following the ISO 6872/2015 guidelines for BFS testing (final dimensions of 12 mm in diameter, 0.7 and 1.2 ± 0.1 mm in thicknesses). Energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses were performed, and mechanical properties were assessed by Vickers hardness, IFR, quasi-static BFS and fatigue tests. RESULTS. All ceramics showed similar chemical compositions, but mainly differed in the amount of yttria, which was higher as the amount of cubic phase in the diffractogram (5Y-PSZ > 4Y-PSZ > 3Y-TZP). The 4Y- and 5Y-PSZ specimens showed surface defects under SEM, while 3Y-TZP exhibited greater grain uniformity on the surface. 5Y-PSZ and 3Y-TZP presented the highest hardness values, while 3Y-TZP was higher than 4Y- and 5Y-PSZ with regard to the IFR. The 5Y-PSZ specimen (0.7 and 1.2 mm) showed the worst mechanical performance (fatigue BFS and cycles until failure), while 3Y-TZP and 4Y-PSZ presented statistically similar values, higher than 5Y-PSZ for both thicknesses (0.7 and 1.2 mm). Moreover, 3Y-TZP showed the highest (1.2 mm group) and the lowest (0.7 mm group) degradation percentage, and 5Y-PSZ had higher strength degradation than 4Y-PSZ group. CONCLUSION. Despite the microstructural differences, 4Y-PSZ and 3Y-TZP had similar fatigue behavior regardless of thickness. 5Y-PSZ had the lowest mechanical performance. [J Adv Prosthodont 2021;13:385–95]en
dc.description.affiliationDepartment of Dental Materials and Prosthodontics São Paulo State University (UNESP) Institute of Science and Technology
dc.description.affiliationCollege of Dentistry University of Taubaté (Unitau)
dc.description.affiliationTechnological Institute of Aeronautics Physics department
dc.description.affiliationCollege of Dentistry Federal University of Santa Maria (UFSM)
dc.description.affiliationUnespDepartment of Dental Materials and Prosthodontics São Paulo State University (UNESP) Institute of Science and Technology
dc.format.extent385-395
dc.identifierhttp://dx.doi.org/10.4047/jap.2021.13.6.385
dc.identifier.citationJournal of Advanced Prosthodontics, v. 13, n. 6, p. 385-395, 2021.
dc.identifier.doi10.4047/jap.2021.13.6.385
dc.identifier.issn2005-7814
dc.identifier.issn2005-7806
dc.identifier.scopus2-s2.0-85123458726
dc.identifier.urihttp://hdl.handle.net/11449/234048
dc.language.isoeng
dc.relation.ispartofJournal of Advanced Prosthodontics
dc.sourceScopus
dc.subjectDental ceramics
dc.subjectMaterial thickness
dc.subjectMechanical stress
dc.subjectStep-stress accelerated fatigue test
dc.subjectY-TZP ceramic
dc.titleMechanical behavior and microstructural characterization of different zirconia polycrystals in different thicknessesen
dc.typeArtigo
unesp.author.orcid0000-0001-9435-2346[1]
unesp.author.orcid0000-0002-0977-5350 0000-0002-0977-5350[2]
unesp.author.orcid0000-0001-8486-2510[3]
unesp.author.orcid0000-0001-8304-898X[4]
unesp.author.orcid0000-0001-7203-6924[5]
unesp.author.orcid0000-0003-0752-6294[6]
unesp.author.orcid0000-0003-0077-3161[7]

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