CENTRO DE TECNOLOGIA DE RECURSOS MINERALES Y CERAMICA
Unidad Ejecutora - UE
Effects of surface treatments on y-tzp phase stability, microstructure and osteoblast cell response,
Y L. BRUNI; M.P. ALBANO; L.B. GARRIDO; L NOVAES TEIXEIRA; A LUIZ ROSA; P TAMBASCO DE OLIVEIRA
ELSEVIER SCI LTD
Lugar: Amsterdam; Año: 2015 vol. 41 p. 14212 - 14222
The effects of hydrothermal and phosphoric acid treatments on the tetragonal ZrO2 stability and surface microstructure were determined for 3 mol% yttria- partially stabilized zirconia (Y-TZP) and Al2O3 doped Y-TZP (Y-TZPA). Y-TZP slip cast compacts were sintered at 1300 - 1500 ºC to achieve fully dense samples. The increase in the sintering temperature enhanced the hydrothermal degradation of Y-TZP. Although the average grain size of YTZPA sintered at 1500 ºC was lower than that of Y-TZP, no significant difference in the ageing behavior between these two ceramics was found. For Y-TZP sintered at 1500 ºC, the volume fraction of monoclinic ZrO2 induced by acid treatment was higher than that obtained after 10 h of hydrothermal treatment. The Al2O3 doping of Y-TZP improved the acid degradation resistance. Osteoblast cell culture studies on the Y-TZP surfaceconfirmed its biocompatibility. The Y-TZP surface supported a higher cell proliferation compared to Y-TZPA. The less degradation on the 1 day acid-treated Y-TZPA surface stimulated cell proliferation, whereas a longer acid treatment reduced cell survival.