Degradation kinetics of high-translucency dental zirconias: Mechanical properties and in-depth analysis of phase transformation

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorAeronautics Technological Institute (ITA)-
Autor(es): dc.creatorPrado, Pedro Henrique Condé Oliveira [UNESP]-
Autor(es): dc.creatorMonteiro, Jaiane Bandoli [UNESP]-
Autor(es): dc.creatorCampos, Tiago Moreira Bastos-
Autor(es): dc.creatorThim, Gilmar Patrocínio-
Autor(es): dc.creatorde Melo, Renata Marques [UNESP]-
Data de aceite: dc.date.accessioned2022-02-22T00:23:19Z-
Data de disponibilização: dc.date.available2022-02-22T00:23:19Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-01-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.jmbbm.2019.103482-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/198032-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/198032-
Descrição: dc.descriptionThis study aimed to evaluate the effects of low temperature degradation (LTD) on commercial dental zirconias (conventional and high-translucent - HT) with different microstructures, as well as on their mechanical properties and t-m phase transformation. The amount of monoclinic zirconia in different depths was quantified using X-ray diffraction (XRD) with different anode tubes (Cr, Co and Cu). XRD was also used to measure the residual stress of the materials at 0 h, 26 h and 140 h aging times. Vickers microhardness and biaxial flexural strength tests were performed. Data were subjected to two-way ANOVA and Tukey's post-hoc test, both with α = 0.05 for means comparisons. Weibull parameters were calculated and compared based on the overlapping of confidence intervals (CI = 95%). HT Zirconia presented smaller grain sizes and had a higher rate of t-m transformation over time. The microstructure of the conventional zirconia showed an expressive increase of the grain size and consequently greater morphological variation with the LTD. The non-aged samples (control) did not present any residual stress and the aged ones presented compression stress. All zirconia showed a residual stress increase with the increase of LTD time, but the conventional one showed a decrease after 140 h. HT zirconia showed no significant change in flexural strength over LTD time, but the conventional one showed a strength decrease after 140 h (681.78 ± 121.18 MPa). Vickers hardness decreased for all zirconia samples after 26 h. The mechanics of LTD is significantly altered in different zirconia microstructures. Zirconias with smaller grains are more prone to t-m phase transformation, but present lower variation of residual stress, while larger grains zirconias have a lower surface area and therefore a more pronounced increase in stress over LTD time. Stress values close to the maximum compression stress generates ejection of the zirconia grains, producing defects and causing reduction of the compression stress and consequently decrease of flexural strength.-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionDepartment of Dental Materials and Prosthodontics São Paulo State University (UNESP) Science and Technology Institute-
Descrição: dc.descriptionPhysics Departament Aeronautics Technological Institute (ITA), 50 Marechal Eduardo Gomes Square-
Descrição: dc.descriptionDepartment of Dental Materials and Prosthodontics São Paulo State University (UNESP) Institute of Science and Technology-
Descrição: dc.descriptionDepartment of Dental Materials and Prosthodontics São Paulo State University (UNESP) Science and Technology Institute-
Descrição: dc.descriptionDepartment of Dental Materials and Prosthodontics São Paulo State University (UNESP) Institute of Science and Technology-
Descrição: dc.descriptionFAPESP: 2016/03688-1-
Idioma: dc.languageen-
Relação: dc.relationJournal of the Mechanical Behavior of Biomedical Materials-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectBiaxial flexural strength-
Palavras-chave: dc.subjectCeramics-
Palavras-chave: dc.subjectDental materials-
Palavras-chave: dc.subjectYttria stabilized tetragonal zirconia-
Título: dc.titleDegradation kinetics of high-translucency dental zirconias: Mechanical properties and in-depth analysis of phase transformation-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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