EFFECT OF TiO2 ADDITION ON BONDING STRENGTH OF CaO-P2O5- Na2O-TiO2 BIOACTIVE GLASS CERAMIC COATING

The effect of titanium dioxide addition on bonding strength of cao-p2o5-na2o-tio2 glass-ceramic systemwas investigated as a coating on titanium substrate. thus, different amounts of tio2 (2, 3.5 and 5mol %) were addedto the base glass batch composition. the prepared glaze slips were applied on the substrate by dip coating method,dried and then heat treated at various temperatures. after that, bonding strength of the glass- substrates wasdetermined via shear stress testing method. the de-bonded interfaces were analyzed by scanning electron microscopy(sem). according to these results, the 5 mol% tio2 containing coating showed the best bonding strength, comparingwith the other coatings. the bioactivity of the coated samples was investigated by soaking them in simulated body fluid(sbf). the surface of the samples was studied using sem and x-ray microprobe and it was observed that an apatitelayer was grown on their surface.