EFFECT OF SURFACE TREATMENTS ON Y-TZP PHASE STABILITY, MICROSTRUCTURE AND OSTEOBLAST CELL RESPONSE

YESICA BRUNI; LILIANA B. GARRIDO; MARÍA P. ALBANO; ADALBERTO LUIZ ROSA; LUCAS NOVAES TEIXEIRA; PAULO TAMBASCO DE OLIVEIRA

CERAMICS INTERNATIONAL

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2015 vol. 41 p. 14212 - 14222

0272-8842

The effect of hydrothermal and phosphoric acid treatments on the tetragonal ZrO2 stability and surface microstructure of Y-TZP and Al2O3 doped Y-TZP (Y-TZPA) were examined. Dense Y-TZP ceramics were prepared by slip casting and subsequently sintered at 1300 - 1500 ºC. Increasing the sintering temperature significantly enhanced the hydrothermal degradation of Y-TZP. Although the average grain size of Y-TZPA sintered at 1500 ºC was lower than that of Y-TZP, there was no significant difference in the ageing behavior between these two ceramics. 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. Biological tests of cell morphology and proliferation confirmed the biocompatibility of Y-TZP surfaces. The Y-TZP surface without acid treatment supported a higher cell proliferation compared with that of Y-TZPA. The less surface degradation of the 1 day acid-treated Y-TZPA appeared to be favorable for cell proliferation, however a longer acid treatment reduced the cell viability.