Degradation of dental ZrO2-based materials after hydrothermal fatigue. part I: XRD, XRF, and FESEM analyses

Jorge PerdigãO, Ana M. Pinto, Regina C.C. Monteiro, Francisco M. Braz Fernandes, Pedro Laranjeira, João P. Veiga

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


The aim was to investigate the effect of simulated low-temperature degradation (s-LTD) and hydrothermal fatigue on the degradation of three ZrO2-based dental materials. Lava, IPS, and NanoZr discs were randomly assigned to (1) Control-Storage in distilled water at 37°C; (2) Aging at 134°C for 5 h (s-LTD); (3) Thermocycling in saliva for 30,000 cycles (TF). XRD revealed that ZrO2 m phase was identified in all groups but TF increased the m phase only for Lava. Under the FESEM, Lava showed no alterations under s-LTD, but displayed corrosion areas up to 60 μm wide after TF. We conclude that TF accelerated the degradation of Lava through an increase in the m phase and grain pull-out from the material surface.

Original languageEnglish (US)
Pages (from-to)256-265
Number of pages10
JournalDental Materials Journal
Issue number2
StatePublished - 2012


  • Electron microscopy
  • Low-temperature degradation (LTD)
  • Thermal fatigue
  • Zirconia


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