Yttria-tetragonal zirconia is used as biomaterial for dental applications e.g. inlays, crowns, bridges. Since Y-TZP may undergo phase transformation, which can results in micro-cracking, structural stability in oral environment is of great importance.

In the present work, hydrothermal stability of low-porous yttria doped zirconia (Y-TZP) was investigated in water and acid solutions. Ceramics with fractional density of tetragonal phase from 90% to around 100%, were produced by biscuit-sintering dry-pressed pellets at different temperatures in an ambient air atmosphere.

The flexural strength, phase composition (XRD) and density were measured for samples before and after corrosion test. The influence of phase transformation on a microstructure was determined using scanning electron microscope.

The results showed that specimens sintered at higher temperature (1450^o-1500^oC) to a fractional density above 95% of the theoretical exhibit low tetragonal to monoclinic phase transformation upon autoclaving in water at 200^oC for 24 hours. The volume expansion due to phase transformation created micro cracks, which reduced flexural strength. The effect of environment pH on phase transformation is also discussed.

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