Aim: This study aims to investigate the adhesive performance of three different universal adhesives to repair aged composite restorations, with or without the application of silane.

Materials And Methods: A hundred and twenty resin composite samples were prepared, aged and randomly divided into 6 main Groups (single bond universal [SBU], All-Bond Universal [ABU], Futurabond U, Clearfil Tri-S Bond, Single Bond 2, and Clearfil SE Bond) and 2 subgroups (with or without silane). A microhybrid composite resin was placed on the aged composite surfaces and light cured. After a micro-shear bonding test, the fracture surfaces were examined under the scanning electron microscopy. Statistical analysis was performed using two-way ANOVA and Tukey's tests.

Results: Among all the universal adhesives, SBU showed the highest bond strength values compared to the other two universal adhesives when used with and without silane ( > 0.05). Between ABU and Futurabond U, no significant difference was observed with silane ( > 0.05) and without silane ( > 0.05). Among conventional adhesives, there was no statistically significant difference ( > 0.05) both with and without silane.

Conclusion: Within the limitations of this study, while SBU can be safely used with and without the application of silane, Futurabond U cannot be used without silane.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5977773PMC
http://dx.doi.org/10.4103/JCD.JCD_11_18DOI Listing

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