- Abstract -

The objectives of the present in vitro study consist of evaluating the effect of four adhesive systems on the shear bond strength of amalgam and a composite material.

Material and Methods: In order to determine the shear bond strength of amalgam and a composite material, four adhesive systems were selected: ExciTE - Vivadent, Xeno III - Dentsply De Trey, Silan (Monobond S- Vivadent) and Prime & Bond NT - Dentsply De Trey and Clearfil Repair - Kuraray. Each group, in which an adhesive system was used, included ten samples. These were prepared using precapsulated amalgam condensed in acrylic matrixes. After amalgam setting, the surface was roughened with a diamond instrument and, after applying specific adhesive agents, the composite resin was fixed with an adhesive agent to the surface of previously conditioned amalgam samples. After 30 days storage in distiled water, each sample was subjected to a shearing test.

Results: Statistical differences were found between groups (One-way ANOVA test). The highest value of shear bond strength (7, 45±0, 58 MPa) was found in group 3.
Conclusions: The use of silane solutions associated to Prime&Bond NT leads to the highest value of shear bond strength as compared to other conditioning systems.

Key words: composite repair, amalgam repair, amalgam shear bond strength.