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Degradation of dental ZrO<Sub>2</Sub>-based materials after hydrothermal fatigue. Part I: XRD, XRF, and FESEM analyses

2012; Japanese Society for Dental Materials and Devices; Volume: 31; Issue: 2 Linguagem: Inglês

10.4012/dmj.2011-216

1881-1361

Jorge PERDIG Atilde O, A. M. P. Pinto, Regina da Conceição Corredeira Monteiro, Francisco Manuel Braz Fernandes, Pedro LARANJEIRA, João Pedro Veiga,

Bone Tissue Engineering Materials

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.