Effect of the commercially available whitening agents on the microshear bond strength of resin composite restoration

Abstract

Objective The aim of the present study was to evaluate the effect of whitening agents on the bond strength of resin composite repair. This study was also carried out to compare the bond strength of a solvent-free self-etch adhesive to that of two different self-etch adhesives. Materials and method Twenty-seven discs were prepared using resin composite, which were assigned into three groups (n = 9). The first group was used as control. The other discs were divided into 2groups according to the whitening agent utilized, Crest 3D White Strips Advanced Vivid and Colgate Visible White 9% Mint applied once a day for 14 days. Each group was further subdivided into 3 subgroups (n = 3) according to the adhesive system used, [solvent-free self-etching adhesive system], [self-etching adhesive system], and [self-etching adhesive system]. Microcylinders were constructed, microshear test was performed and the data was registered in MPa. Results The whitening agent, the adhesive resin system and the interaction between the variables had a significant effect on the bond strength (P ≤ 0.05). [Solvent-free self-etching adhesive system] and [Self-etching adhesive system] performed similarly, where both showed significantly highest mean microshear bond strength values. Whereas, [self-etching adhesive system] showed the statistically lowest mean bond strength. The highest mean bond strength was found without whitening agent, thenColgate visible white, while Crest 3D white strips showed the lowest bond strength values. Conclusion It was concluded that the tested whitening agents reduced the bond strength, with comparable performance of both (solvent-free self-etching adhesive system).