Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Dental Materials

Objectives: The aim of the study was to develop a predictable controlled method for the precipitation of nano-alumina coating as a surface treatment in trial to improve zirconia /resin bonding and to determine the durability of bond between coated samples and commercially available resin cement. Conclusions. The deposition method of nano-alumina is a promising, yet complex method to be used on zirconia substrate according to both mechanisms. Meticulous selection of alumina precursors, pH, temperature and stirring time as crucial and sensitive parameters in co-precipitation of alumina on zirconia substrates. Aluminum nitride is a more suitable precursor for nano-alumina deposition from suspension on zirconia substrate.The use of sulfuric acid as an innovative surface pre-coating method to the zirconia indicates its direct beneficial influence on surface roughness and bond strength of zirconia substrates with adhesive cement resin.Control polished specimens had a negative influence on strength showing the lowest shear bond strength values to adhesive resin cement of all subgroups

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