Abstract
The silicon coating was deposited by sol–gel dipping process as intermediate layer to minimize titanium oxidation for Ti-porcelain restorations. The effect of silicon coating on bonding strength of titanium–porcelain was investigated. The adhesion between the titanium and porcelain was evaluated by three-point flexure bonding test. The result of TG-DSC analysis showed that the optimal treating temperature for SiO2 coating was 300°C. Silicon coating was effective in preventing titanium oxide layer formation and improving bonding strength. The improvement in bonding strength of titanium–porcelain was about 10%. At the same time, the in vitro bioactivity of the titanium and SiO2 coating was studied by cytotoxicity test. The methyl thiazolyl tetrazolium assay results demonstrated that the cytotoxicities of SiO2 coating were ranked as 0. The SEM results revealed the existence of microcrack on the SiO2 coating surface. Failure of the titanium–porcelain predominantly occurred at the titanium-oxide interface. The SiO2 coating increased bonding strength of titanium–porcelain and could be used for dental implant materials.
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