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Effect of Grinding and Multi-Stimuli Aging on the Fatigue Strength of a Y-TZP Ceramic.
Silvestri, Tais; Pereira, Gabriel Kalil Rocha; Guilardi, Luis Felipe; Rippe, Marilia Pivetta; Valandro, Luiz Felipe.
Afiliação
  • Silvestri T; MSciD and PhD Graduate Programs in Oral Science (Prosthodontic Units), School of Dentistry, UFSM - Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
  • Pereira GKR; MSciD and PhD Graduate Programs in Oral Science (Prosthodontic Units), School of Dentistry, UFSM - Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
  • Guilardi LF; MSciD Graduate Program, School of Dentistry, IMED - Faculdade Meridional, Passo Fundo, RS, Brazil.
  • Rippe MP; MSciD and PhD Graduate Programs in Oral Science (Prosthodontic Units), School of Dentistry, UFSM - Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
  • Valandro LF; MSciD and PhD Graduate Programs in Oral Science (Prosthodontic Units), School of Dentistry, UFSM - Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
Braz Dent J ; 29(1): 60-67, 2018.
Article em En | MEDLINE | ID: mdl-29267526
This study aimed to investigate the effect of grinding and multi-stimuli aging on the fatigue strength, surface topography and the phase transformation of Y-TZP ceramic. Discs were manufactured according to ISO-6872:2008 for biaxial flexure testing (diameter: 15 mm; thickness: 1.2 mm) and randomly assigned considering two factors "grinding" and "aging": C- control (as-sintered); CA- control + aging; G- ground; GA- ground + aging. Grinding was carried out with coarse diamond burs under water-cooling. Aging protocols consisted of: autoclave (134°C, 2 bars pressure, 20 hours), followed by storage for 365 days (samples were kept untouched at room temperature), and by mechanical cycling (106 cycles by 20 Hz under a load of 50% from the biaxial flexure monotonic tests). Flexural fatigue strengths (20,000 cycles; 6 Hz) were determined under sinusoidal cyclic loading using staircase approach. Additionally, surface topography analysis by FE-SEM and phase transformation analysis by X-ray Diffractometry were performed. Dixon and Mood methodology was used to analyze the fatigue strength data. Grinding promotes alterations of topographical pattern, while aging apparently did not alter it. Grinding triggered t-m phase transformation without impacting the fatigue strength of the Y-TZP ceramic; and aging promoted an intense t-m transformation that resulted in a toughening mechanism leading to higher fatigue strength for as-sintered condition, and a tendency of increase for ground condition (C < CA; G = GA). It concludes that grinding and aging procedures did not affect deleteriously the fatigue strength of the evaluated Y-TZP ceramic, although, it promotes surface topography alterations, except to aging, and t-m phase transformation.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Teste de Materiais / Cerâmica / Materiais Dentários Idioma: En Revista: Braz Dent J Assunto da revista: ODONTOLOGIA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Brasil
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Teste de Materiais / Cerâmica / Materiais Dentários Idioma: En Revista: Braz Dent J Assunto da revista: ODONTOLOGIA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Brasil