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Effect of ion exchange on hardness and fracture toughness of dental porcelains

Cesar, Paulo Francisco ; Gonzaga, Carla Castiglia ; Miranda Jr, Walter Gomes ; Yoshimura, Humberto Naoyuki

Journal of biomedical materials research. Part B, Applied biomaterials, 2007-11, Vol.83B (2), p.538-545 [Periódico revisado por pares]

Hoboken: Wiley Subscription Services, Inc., A Wiley Company

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  • Título:
    Effect of ion exchange on hardness and fracture toughness of dental porcelains
  • Autor: Cesar, Paulo Francisco ; Gonzaga, Carla Castiglia ; Miranda Jr, Walter Gomes ; Yoshimura, Humberto Naoyuki
  • Assuntos: Aluminum Silicates - chemistry ; Dental Porcelain - chemistry ; dental porcelains ; Dental Restoration Failure ; fracture toughness ; Hardness ; Humans ; Ion Exchange ; Materials Testing ; Microscopy, Electron, Scanning
  • É parte de: Journal of biomedical materials research. Part B, Applied biomaterials, 2007-11, Vol.83B (2), p.538-545
  • Notas: FAPESP
    CNPq
    istex:8C3C6BBE5078E5CB28D6DD28A069A03179698D84
    ArticleID:JBM30826
    ark:/67375/WNG-RWM5MNNQ-P
    CAPES
    ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
    ObjectType-Article-1
    ObjectType-Feature-2
  • Descrição: The objective of this study was to evaluate the effect of ion exchange, IE, on fracture toughness KIc and hardness H of five dental porcelains with different microstructures: B, Ceramco II/Dentstply; C, Finesse/Dentsply; Cb, Cerabien/Noritake; D, d.Sign/Ivoclar; V, Vitadur Alpha/Vita. Specimens were sintered according to manufacturers' instructions, n = 10. Vickers indentations were made on specimens' surfaces before and after IE to calculate H and KIc. IE treatment consisted in coating the surface of the specimen with slurry of KNO3 and distilled water, with subsequent drying for 20 min at 150°C and heating for 30 min at 450°C. Microstructural analysis was also performed. The measured leucite contents were 22, 15, 6, 0, and 0% for porcelains B, D, C, Cb, and V, respectively. Porcelains C, Cb, D, and V showed a significant increase in hardness after IE. Hardness of porcelain B was not affected by IE. Materials with lower leucite content tended to present higher increases in hardness after ion exchange. Ion exchange significantly increased KIc between 64 and 156% of 4 out of 5 porcelains studied. Porcelain B was the only one to present a decrease in fracture toughness after ion exchange. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2007
  • Editor: Hoboken: Wiley Subscription Services, Inc., A Wiley Company
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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