Some phosphate-bonded investment materials are compatible with molten titanium, while others react strongly with it. The oxidation of the metal surface increases the bonding strength between metal and ceramics, but the excess oxidation film on the metal may decrease it. Objectives: This study evaluated the shear bond strength of one ceramic to casted pure titanium in two different investments. Methods: For the first group (G1), ten metallic structures (4mm in diameter x 4mm thick) were cast in high-purity argon atmosphere using Rematitan Plus (Dentaurum) investment. For the second group (G2), the other ten left structures were casted using Rematitan Ultra (Dentaurum) investment. All of them were abraded with aluminum oxide before the application of proper ceramic's system (Triceram Triline Ti/Sprident). The bond and opaque ceramic were applied, baked and the structures were placed in a teflon matrices which helped to fill with dentin porcelain. After baking, shear bond strength tests were performed by using a special device that produced perpendicular load onto metal/opaque-porcelain interface on an Instron Universal testing machine. The specimens were loaded until the fractures were observed. Results: Data was analyzed statistically (one-way ANOVA) and the results did not show significant statistic differences between the tested investments (alpha=0.05). The averages were 62.44MPa and 61.64MPa to G1 and G2, respectively. Conclusions: The authors concluded that both investments are indicated to cast titanium to it be veneered by the tested porcelain.

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