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Effect of glazing application side and mechanical cycling on the biaxial flexural strength and Weibull characteristics of a Y-TZP ceramic

Lobo, Carolina Machado Martinelli ; Sacorague, Sâmia Carolina Mota Cavalcanti ; Silva, Nathalia Ramos da ; Costa, Anna Karina Figueiredo ; Alves, Larissa Marcia Martins ; Bottino, Marco Antônio ; Özcan, Mutlu ; Souza, Rodrigo Othávio de Assunção E ; Melo, Renata Marques de

Journal of applied oral science, 2020-01, Vol.28, p.e20200438-e20200438 [Periódico revisado por pares]

Brazil: Faculdade De Odontologia De Bauru - USP

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  • Título:
    Effect of glazing application side and mechanical cycling on the biaxial flexural strength and Weibull characteristics of a Y-TZP ceramic
  • Autor: Lobo, Carolina Machado Martinelli ; Sacorague, Sâmia Carolina Mota Cavalcanti ; Silva, Nathalia Ramos da ; Costa, Anna Karina Figueiredo ; Alves, Larissa Marcia Martins ; Bottino, Marco Antônio ; Özcan, Mutlu ; Souza, Rodrigo Othávio de Assunção E ; Melo, Renata Marques de
  • Assuntos: Ceramics ; Dental Porcelain ; Dental stress analysis ; Dentistry ; DENTISTRY, ORAL SURGERY & MEDICINE ; Flexural Strength ; Materials Testing ; Original ; Stress, Mechanical ; Surface Properties ; Y-TZP ; Yttrium ; Zirconium
  • É parte de: Journal of applied oral science, 2020-01, Vol.28, p.e20200438-e20200438
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    Conflicts of interest
    The authors report no conflicts of interest
    Martinelli-Lobo, Carolina Machado: Data curation (Equal); Methodology (Equal). Sacorague, Samia Carolina Mota Cavalcanti: Data curation (Equal); Formal analysis (Equal); Methodology (Equal). Silva, Nathalia Ramos: Supervision (Equal); Writing-original draft (Equal). Costa, Anna: Investigation (Equal); Methodology (Equal); Project administration (Equal). Alves, Larissa: Formal analysis (Equal); Resources (Equal); Validation (Equal). Bottino, Marco Antonio: Funding acquisition (Equal); Supervision (Equal); Visualization (Equal). Ozcan, Mutlu: Conceptualization (Equal); Writing-review & editing (Equal). Melo, Renata Marques: Conceptualization (Equal); Supervision (Equal). Souza, Rodrigo: Conceptualization (Equal); Supervision (Equal); Writing-review & editing (Equal).
    Authors' contributions
  • Descrição: Glaze application on monolithic zirconia (Y-TZP) can be a practical approach to improve the mechanical properties of this material. Our study evaluated the effect of glazing side and mechanical cycling on the biaxial flexure strength (BFS) of a Y-TZP. Eighty sintered Y-TZP discs (Ø:12 mm; thickness: 1.2 mm - ISO 6872) were produced and randomly assigned into eight groups (n=10), according to the factors "glazing side" (control - no glazing; GT - glaze on tensile side; GC - glaze on compression side; GTC - glaze on both sides) and "mechanical aging" (non-aged and aged, A - mechanical cycling: 1.2×106, 84 N, 3 Hz, under water at 37°C). Specimens were subjected to BFS test (1 mm/min; 1,000 Kgf load cell) and fractured surfaces were analyzed by stereomicroscopy and SEM. Hsueh's rigorous solutions were used to estimate the stress at failure of glazed specimens. Two-way ANOVA, Tukey's test (5%), and Weibull analysis were performed. The "glazing side", "mechanical aging" and the interaction of the factors were significant (p<0.05). Groups GC (1157.9±146.9 MPa), GT (1156.1±195.3 MPa), GTC (986.0±187.4 MPa) and GTC-A (1131.9±128.9 MPa) presented higher BFS than control groups (Tukey, 5%). Hsueh's rigorous solutions showed that the maximum tensile stress was presented in the bottom of zirconia layer, at the zirconia/glaze interface. Weibull characteristic strength (σo) of the GC was higher than all groups (p<0.05), except to GT, GTC-A and GTC, which were similar among them. The fractography showed initiation of failures from zirconia the tensile side regardless of the side of glaze application and fatigue. Glazing zirconia applied on both tensile and compression sides improves the flexural strength of Y-TZP, regardless the mechanical aging.
  • Editor: Brazil: Faculdade De Odontologia De Bauru - USP
  • Idioma: Inglês;Português
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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