Moisture sensitive degradation in TiO2-Y2O3-ZrO2

Effect of dopants and sintering temperature on microstructure and low temperature degradation of dental Y-TZP-zirconia

“…This is in conforming to the results of Tanaka and Ban. 81,82 Numerous authors have attempted to explain the mechanism of LTD. [13][14][15][16][17][18][19][24][25][26][27][28][29][30][31][32] Chevalier et al have described the kinetic of ageing of zirconia and have given together with Duong et al a mechanism which explains better the ageing process. [13][14][15][16][17][18]30 According to Chevalier ageing occurs by a slow surface transformation to the stable monoclinic phase in the presence of water or water vapor.…”

The influence of grain size on low‐temperature degradation of dental zirconia

“…These authors did not accept the depletion of yttrium as the result of Y(OH) 3 formation or the dissolution of Y 3+ during hydrothermal treatment. According to Hughes et al, the generation of O 2– is responsible for the rapid annealing of surface oxygen vacancies 15. The penetration of O 2– into the lattice destabilizes the t‐phase and the transformation or nucleation of the m‐phase domains occurs 15.…”

Effect of autoclave treatment on bonding strength of dental zirconia ceramics to resin cements

“…Slightly broader O 1s peaks at the about 531 eV at the outersurface layer were observed with autoclave treatment. 8), 9) These results indicate that autoclave treatment enhances the zirconia surface to adsorb the hydroxide. Moreover adsorbed hydroxide on the zirconia surface improve the surface propeties, which may subsequently promote the adhesive reaction at the interface between zirconia surface and resin cement.…”