Aging resistance of an experimental zirconia-toughened alumina composite for large span dental prostheses: Optical and mechanical characterization

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorNucl & Energy Res Inst-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorNYU-
Autor(es): dc.contributorNYU Langone Med Ctr-
Autor(es): dc.contributorNYU Tandon Sch Engn-
Autor(es): dc.creatorBenalcazar Jalkh, E. B.-
Autor(es): dc.creatorBergamo, E. T. P.-
Autor(es): dc.creatorMonteiro, K. N.-
Autor(es): dc.creatorCesar, P. F.-
Autor(es): dc.creatorGenova, L. A.-
Autor(es): dc.creatorLopes, A. C. O.-
Autor(es): dc.creatorLisboa Filho, P. N. [UNESP]-
Autor(es): dc.creatorCoelho, P. G.-
Autor(es): dc.creatorSantos, C. F.-
Autor(es): dc.creatorBortolin, F.-
Autor(es): dc.creatorPiza, M. M. T.-
Autor(es): dc.creatorBonfante, E. A.-
Data de aceite: dc.date.accessioned2022-02-22T00:10:24Z-
Data de disponibilização: dc.date.available2022-02-22T00:10:24Z-
Data de envio: dc.date.issued2020-12-09-
Data de envio: dc.date.issued2020-12-09-
Data de envio: dc.date.issued2020-04-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.jmbbm.2020.103659-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/196769-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/196769-
Descrição: dc.descriptionPurpose: To synthesize a zirconia-toughened alumina (ZTA) composite with 85% alumina matrix reinforced by 15% zirconia and to characterize its optical and mechanical properties before and after artificial aging, to be compared with a conventional dental zirconia (3Y-TZP). Material and methods: After syntheses, ZTA and 3Y-TZP powders were uniaxially and isostatically pressed. Green-body samples were sintered and polished to obtain 80 disc-shaped specimens per group (12 x 1 mm, ISO 6872:2015). The crystalline content and microstructure were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Optical properties were determined by the calculation of contrast ratio (CR) and translucency parameter (TP) using reflectance data. Mechanical properties were assessed by Vickers hardness, fracture toughness and biaxial flexural strength test (BFS). All analyses were conducted before and after artificial aging (20h, 134 degrees C, 0.22 MPa). Optical parameters and microhardness differences were evaluated through repeated-measures analysis of variance (p < 0.05). BFS data were analyzed using Weibull statistics (95% CI). Results: The synthesis of the experimental ZTA composite was successful, with 98% of theoretical density, as shown in the SEM images. XRD patterns revealed typical zirconia and alumina crystalline phases. ZTA optical properties parameters showed no effect of aging, with a high CR and low TP values denoting a high masking-ability. 3Y-TZP presented lower masking-ability and aging significantly affected its optical properties. ZTA Vickers hardness, fracture toughness and Weibull parameters, including characteristic stress and Weibull modulus were not influenced by aging, while 3Y-TZP presented a significant decrease in characteristic stress and increase in fracture toughness after aging. The ZTA probability of survival for missions of 300 and 500 MPa was estimated at similar to 99% validating its use for 3-unit posterior fixed dental prostheses (FDP), and no different from conventional 3Y-TZP. At high-stress mission (800 MPa) a significant decrease in probability of survival was observed for aged 3Y-TZP (84%) and for immediate and aged ZTA (73 and 82% respectively). Conclusion: The ZTA composite presented a dense microstructure, with preservation of the crystalline content, optical and mechanical properties after artificial aging, which encourages future research to validate its potential use for large span FDP.-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionEMU-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionUniv Sao Paulo, Dept Prosthodont & Periodontol, Bauru Sch Dent, Al Otavio Pinheiro Brisola 9-75, BR-17012901 Bauru, SP, Brazil-
Descrição: dc.descriptionUniv Sao Paulo, Sch Dent, Dept Biomat & Oral Biol, Sao Paulo, SP, Brazil-
Descrição: dc.descriptionNucl & Energy Res Inst, Sao Paulo, SP, Brazil-
Descrição: dc.descriptionSao Paulo State Univ, Dept Phys, Bauru, SP, Brazil-
Descrição: dc.descriptionNYU, Coll Dent, Dept Biomat & Biomimet, New York, NY USA-
Descrição: dc.descriptionNYU Langone Med Ctr, Hansjorg Wyss Dept Plast Surg, New York, NY USA-
Descrição: dc.descriptionNYU Tandon Sch Engn, Mech & Aerosp Engn, New York, NY USA-
Descrição: dc.descriptionUniv Sao Paulo, Bauru Sch Dent, Dept Biol Sci, Discipline Pharmacol, Sao Paulo, SP, Brazil-
Descrição: dc.descriptionSao Paulo State Univ, Dept Phys, Bauru, SP, Brazil-
Descrição: dc.descriptionFAPESP: 2012/19078-7-
Descrição: dc.descriptionEMU: 2016/18818-8-
Descrição: dc.descriptionCNPq: 304589/2017-9-
Descrição: dc.descriptionCNPq: 434487/2018-0-
Descrição: dc.descriptionCAPES: 001-
Descrição: dc.descriptionFAPESP: 2016/24165-7-
Descrição: dc.descriptionFAPESP: 2016/18657-4-
Descrição: dc.descriptionFAPESP: 2016/17793-1-
Descrição: dc.descriptionFAPESP: 2017/19362-0-
Descrição: dc.descriptionFAPESP: 2018/03072-6-
Descrição: dc.descriptionFAPESP: 2019/00452-5-
Descrição: dc.descriptionFAPESP: 2019/14798-0-
Descrição: dc.descriptionFAPESP: 2019/08693-1-
Formato: dc.format9-
Idioma: dc.languageen-
Publicador: dc.publisherElsevier B.V.-
Relação: dc.relationJournal Of The Mechanical Behavior Of Biomedical Materials-
???dc.source???: dc.sourceWeb of Science-
Palavras-chave: dc.subjectCeramics-
Palavras-chave: dc.subjectAlumina-
Palavras-chave: dc.subjectZirconia-
Palavras-chave: dc.subjectMicrostructure-
Palavras-chave: dc.subjectMechanical properties-
Palavras-chave: dc.subjectOptical properties-
Título: dc.titleAging resistance of an experimental zirconia-toughened alumina composite for large span dental prostheses: Optical and mechanical characterization-
Tipo de arquivo: dc.typelivro digital-
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