Structural evaluation of ZnO substitution for CaO in glass ionomer cement synthesized by sol-gel method and their properties

摘要

The substitution of ZnO for CaO site and the limitation of ZnO addition in the sol-gel ionomer glass composition at different calcination temperatures were evaluated and characterized in-depth by X-ray powder diffraction and X-ray photoelectron spectroscopy techniques in this study. The relationship between the compressive strength and the final cement structure was demonstrated by the ion-releasing behavior and synchrotron-based X-ray absorption spectroscopy (XAS) technique. The setting time, in vitro cytotoxicity, bioactivity and tooth adhesion ability of the sol-gel GICs were also evaluated. As expected, ZnO containing GICs presented antibacterial properties under the visible light condition as photocatalysis effect. Although the low crosslinking ability of Zn atoms to the polyacrylic liquid reduced the compressive strength, the compressive strength could be improved by compromising the calcination temperature. Moreover, this study also shows that the ZnO containing GICs had promising results on the biological properties which offered potential advantages in clinical use. [GRAPHICS]