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Comparison between different fracture toughness techniques in zirconia dental ceramics.
Alves, Manuel Fellipe Rodrigues Pais; Dos Santos, Claudinei; Elias, Carlos Nelson; Amarante, José Eduardo Vasconcellos; Ribeiro, Sebastião.
Afiliación
  • Alves MFRP; CICECO - Department of Materials and Ceramics Engineering, University of Aveiro, Aveiro, Portugal.
  • Dos Santos C; UERJ-FAT - Faculty of Technology, University of Rio de Janeiro State, Resende, Brazil.
  • Elias CN; IME - Materials Science Department, Military Institute of Engineering, Brazil.
  • Amarante JEV; UFF - Department of Specific Training, Federal Fluminense University, Nova Friburgo, Brazil.
  • Ribeiro S; USP-EEL - Materials Engineering Department, Lorena Engineering School, University of São Paulo, Lorena, Brazil.
J Biomed Mater Res B Appl Biomater ; 111(1): 103-116, 2023 01.
Article en En | MEDLINE | ID: mdl-35849489
Vickers indentation (IF) and single-edge-V-notched beam (SEVNB), to measure the fracture toughness (KIC ) of zirconia-based dental ceramics and mathematical models were proposed to establish a correlation between both. Zirconia (ZrO2 ) stabilized with 3 mol. % of Y2 O3 (3Y-TZP) and 5 mol% of Y2 O3 (5Y-PSZ) were compacted (n = 42) and sintered for 2 h at different temperatures (1475°C, 1500°C, 1550°C, or 1600°C). After sintering, they were characterized by relative density using the ASTM C373-88 standard, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The average grain size was measured according to the ASTM E1382-97 standard. The fracture toughness (KIC ) was determined using two methods: Vickers indentation fracture toughness (KIC-IF ): method based on mathematical modeling that considers the parameters used for the Vickers hardness test and Fracture toughness by the single-edge-V-notch-beam (KIC-SEVNB ): method proposed by ISO 23146:08. The main phases of the 3Y-TZP and 5Y-PSZ ceramics were ZrO2 -tetragonal and ZrO2 -cubic, respectively. The 3Y-TZP specimens showed equiaxed grains with average grain sizes ranging from 0.55 to 0.79 µm. The grain sizes of 5Y-PSZ of specimens sintered at 1475°C and 1600°C were 0.62 and 2.32 µm, respectively. For all ceramics the crack size ratio was c/a < 2.5, suggesting a Palmqvist-type crack system. The fracture toughness measured by the Vickers indentation method (KIC-IF ) and by the SEVNB method (KIC-SEVNB ) was the same when the experimental data were fit to a mathematical model.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Circonio / Cerámica Idioma: En Revista: J Biomed Mater Res B Appl Biomater Asunto de la revista: ENGENHARIA BIOMEDICA Año: 2023 Tipo del documento: Article País de afiliación: Portugal Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Circonio / Cerámica Idioma: En Revista: J Biomed Mater Res B Appl Biomater Asunto de la revista: ENGENHARIA BIOMEDICA Año: 2023 Tipo del documento: Article País de afiliación: Portugal Pais de publicación: Estados Unidos