The silicon coating was deposited by sol–gel dipping process as intermediate layer to minimize titanium oxidation for Ti-porcelain restorat ons. 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 SiO_2 coating was 300℃. 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 SiO_2 coating was studied by cytotoxicity test. The methyl thiazolyl tetrazolium assay results demonstrated that the cytotoxicities of SiO_2 coating were ranked as 0. The SEM results revealed the existence of microcrack on the SiO_2 coating surface. Failure of the titanium–porcelain predominantly occurred at the titanium-oxide interface. The SiO_2 coating increased bonding strength of titanium–porcelain and could be used for dental implant materials.
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