Silane has not been thoroughly evaluated in its application in composite repairs. Objective: To assess the effect of silane in different combinations of resin-based composites and adhesive agents on shear-bonding strength of composite repairs in vitro. Methods: 540 samples were divided into 54 subgroups. Three types of resin based composite, including two hybrids (Tetric Ceram®, Ivoclar and Four Seasons®, Ivoclar) and one microfill (Heliomolar®, Ivoclar) were used as base and repair materials in alternate. Three types of adhesive material were used: All Bond II®, (Bisco), Optibond Solo®, (Kerr) and Clearfil SE®, (Kuraray). Composite bases were thermo-cycled, microabraded, and half the samples silanated and adhesive bonding materials applied following manufacturer's recommendations. Repair composites were then placed, and the specimens were thermo-cycled again before shear–bond strength testing was done with an Instron machine (model 4204). Results: The range of shear-bond strength was 15 to 42 MPa for all the specimens. There was no statistically significant difference in shear-bond strength among the resin-based composites when used as base materials. In regard to adhesives, small but statistically significant differences were found between All Bond II® (23.6MPa) and Clearfil® SE (21.5MPa) (P<0.05) and between All Bond II and Optibond Solo Plus® (20.8MPa) (P<0.05) in non-silanated samples. When composite surface was silanated, shear bond strength increased with all the adhesive agents used (Optibond Solo Plus® 28.9 MPa, Clearfil® SE 26.5 and All Bond II® 26.1MPa ). When used as repair material, Tetric Ceram® (26.6MPa non-silanated, 34.4 MPa silanated) demonstrated significantly better shear-bond strength than Heliomolar® (21.5MPa and 23.1 MPa respectively) (P<0.0001) and Four Seasons® (17.6MPa and 24.2 MPa) (P<0.01). Conclusion: Application of silane increased the bond strength of all adhesive agents used in this study. Tetric Ceram, when used as repair material, demonstrated superior bond strength when compared with Heliomolar and Four Seasons.

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