Objective: The purpose of this in vitro study was to evaluate shear bond strength (SBS) of resin-based composite to cobalt–based alloy. Method: 10 metal plates made of experimental S1 alloy having the dimensions (20 ± 1) mm x (10 ± 1) mm x (2 ± 0,5) mm were randomly assigned to two equal groups: group I - burnished to obtain uniform and polished surface, Group II - non-burnished after casting, additionally treated with silane in acetone. OCM-5 resin-based composite material was bonded onto S1 cobalt-based alloy surfaces of group I and II, using experimental OBM-5S NFA. All samples were tested at Instron machine at 0.75 mm/min (SBS). Data were analysed by t test and coefficient of variation (V). Results: Burnished alloy specimens (group I) achieved lower SBS values from the non-burnished ones: group I – 5.35 MPa, SD 3.87, V = 72.39 %; group II – 12.57 MPa, SD 5.72, V = 45.54 %. Statistical analyses revealed significant differences between groups I and II (p < 0.05). Conclusion: Results obtained suggest that non-burnished surface of cobalt-based alloy might improve for a longer term in the oral cavity, strength of metal-resin bond in restorative dentistry with original PM3EDM-based NFA use.

CED Robert Frank Awards, Senior

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