Ojective This study aims at assessing the effect of different surface treatment on bonding strength of titanium and resin. Methods Metal specimens were prepared to divide into six groups randomly like following: polishing(group A), etching(group B), sandblasting(group C), sand blasting and etching(group D), microare-oxidation(group E), TiN film(group F). According to the groups, to treat the metal specimens, and to take one from each group to measure the surface roughness with a roughness machine after that all the specimens were coated with crown and bridge composite resin to fixed area. The fracture surface morphology of the titanium-resin was observed using a scanning electron microscope(SEM) and the energy dispersive X spectrometer to analysis the elemental composition. The shear bond strengths of the specimens were evaluated by a Universal Testing Machine. Results The surface roughness of each group were (0.370±0.039) μm for group A, (1.456±0.044) μm for group B, (2.044±0.019) μm for group C, (1.970±0.047) μm for group D, (0.683±0.023) μm for group E, and (2.195±0.066) μm for group F. The shear bond strengths of each groups were (5.84±0.30) MPa for group A, (10.22±0.63) MPa for group B, (10.78±0.45) MPa for group C, (12.24±0.46) MPa for group D, (13.82±0.61) MPa for group E, and (16.81±0.74) MPa for group F. We can find polymerization porcelain remain on titanium porcelain metal surface of group B to group E, by watching through the results of SEM. Conclusion Sandblasting and etching together, microare-oxidation and TiN film can improve the bonding strength of titanium and crown and bridge composite. resin obviously.
