Effect of pH variation on the subcritical crack growth parameters of glassy matrix ceramics

Renata M. Melo, Cristiane Pereira, Nathália C. Ramos, Fernanda A. Feitosa, Amanda M.O. Dal Piva*, João Paulo M. Tribst, Mutlu Özcan, Antonio O.C. Jorge

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The goals of our study were to calculate the subcritical crack growth (SCG) parameters of two veneering ceramics stored in water or Streptococcus mutans (S. mutans) biofilm and remineralizing medium, with indentation flaws. Feldspar (VM7) and leucite-reinforced (VM13) glass ceramic disks (Vita Zahnfabrik, Bad Säckingen, Germany) were made according to ISO 6872. Some specimens were indented with a Vickers diamond and the crack dimensions were measured. The specimens were fractured for a calculation of inert strength or further stored in water or submitted to pH variation, under preloading tension. Finally, the SCG parameters were calculated after the specimens were fractured under four stressing rates (MPa/s). Weibull analysis was conducted on non-indented specimens. XPS was performed as qualitative analysis. The subcritical crack of leucite ceramic did not vary with the media storage, but the glass-ceramic experienced a retarded growth after pH variation. The materials presented low Weibull modulus. Qualitative elemental analyses showed chemical modification on both ceramics. Therefore, the crack growth of leucite-reinforced ceramic was less affected by the environment pH than glass-ceramic.

Original languageEnglish
Pages (from-to)2449-2456
Number of pages8
JournalInternational Journal of Applied Ceramic Technology
Volume16
Issue number6
DOIs
Publication statusPublished - 1 Nov 2019

Bibliographical note

Funding Information:
Funding information This work was supported by FAPESP (The State of S?o Paulo Research Foundation), under grants #2009/50030-8 and #2010/50450-4. We thank Prof. Ivan Balducci for assistance with the statistical analysis. We are also grateful to Mr. Rodolfo Padilha for technical assistance with the indentations. This work was supported by FAPESP (The State of S?o Paulo Research Foundation), under grants #2009/50030-8 and #2010/50450-4. We thank Prof. Ivan Balducci for assistance with the statistical analysis. We are also grateful to Mr. Rodolfo Padilha for technical assistance with the indentations.

Publisher Copyright:
© 2019 The American Ceramic Society

Keywords

  • aging
  • crack velocity
  • fatigue
  • glass-ceramics
  • subcritical crack growth

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