Degradation of dental ZrO 2-based materials after hydrothermal fatigue. part I: XRD, XRF, and FESEM analyses
- Citation:
- PerdigãO, J. a, A. M. b Pinto, R. C. C. c Monteiro, F. M. c Braz Fernandes, P. b Laranjeira, and J. P. c Veiga. "Degradation of dental ZrO 2-based materials after hydrothermal fatigue. part I: XRD, XRF, and FESEM analyses." Dental Materials Journal. 31 (2012): 256-265.
Abstract:
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 ZrO 2 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.
Notes:
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