Purpose: the aim of the study was to evaluate the effect of surface modification on ceramometal bond strength of a titanium based system. Materials and Methods: A total of thirty discs of machine milled titanium were used in this investigation and were divided equally into three groups of 10 samples each according to the type of acidic immersion solutions. Group I was a control group with no acidic immersion. Group II was immersed in 35% hydrochloric (HCL) aqueous Solution. Group III was immersed in 35% nitric acid (HNO3)-5%hydrofiuoric (HF) aqueous Solution. Each group was further subdivided into two subgroups of 5 samples each according to whether immersed in caustic bath of (NaOH solution) or not before acidic immersion. Sub group A was used as control with no immersion in caustic solution. Sub group B was immersed in a caustic bath (50% NaOH-10% CuSO4.5H2O aqueous solution). All groups were air-abraded with 110µm alumina using an airborne particle abrasion standardization device. Porcelain application to all the samples was performed according to manufacturer’s instructions. Shear bond strength test was carried out by using circular interface shear test to evaluate the titanium porcelain bond. SEM after debonding was carried out at the interface on representative samples to evaluate the mode of failure at the metal - porcelain interface. All data were recorded, evaluated and statistically analyzed.Results: The use of HCL acid solutions did not improve titanium-ceramic shear bond strength values when compared to the control group that represented the manufacturer’s protocol, The use of HNO3-HF acid solution improved titanium-ceramic shear bond strength values when compared to the control and HCL group, and finally regardless of the tested acid type, porcelain adherence to machine milled titanium could be improved by the caustic baths used in the study.Conclusion: The use of HNO3-HF with caustic bath (NaOH-CuSO4) significantly improved the titanium-ceramic bonding strength values.