Abstract
Abstract Introduction Glass ionomer cements are often used as a base or cavity lining prior to restorative material. Objective To evaluate the bond strength of a composite resin to different glass ionomer cements, when using a two-step conventional and self-etching adhesive systems. Material and method Three glass ionomer cements (Ketac Molar Easymix, Vitremer and Vitrebond), the composite resin Filtek Z350 XT and the adhesive systems Adper Single Bond 2, Clearfil SE Bond and Adper Easy One were used. As negative control, resin was bonded to cement without using an adhesive system. Holes (4 mm diameter, 2 mm deep) prepared in acrilic bloks were filled with the glass ionomer cements (n=12/group). On the surface, an area of 1mm in diameter was delimited, the adhesive system was applied, and a specimen of composite resin with 1 mm height was made. After 24 hours storage (37 °C and 100% humidity), the microshear test was performed. Data were analyzed using two-way ANOVA and Tukey test for comparison between groups (α=0.05). Result The adhesive systems significantly improved the bond strenght of composite resin to glass ionomer cements (p≤0.001). There was no significant difference in bond strength when self-etching adhesive systems were compared with the simplified etch-and-rinse adhesive, except for Vitrebond where Clearfil SE Bond determined higher bond strength when compared to Adper Single Bond 2 (p=0.003). Conclusion Self-etching adhesive systems are a good option for establishing the bond between the composite resin and the glass ionomer cement.
Highlights
INTRODUCTIONThe increasing demand for aesthetic restorations and the evolution of composite resins (CR) have encouraged the use of these materials in posterior teeth
Glass ionomer cements are often used as a base or cavity lining prior to restorative material
The increasing demand for aesthetic restorations and the evolution of composite resins (CR) have encouraged the use of these materials in posterior teeth. When they are associated with adhesive systems in deep dentin without a protection of the pulpodentin complex, they are an important factor contributing to pulpal irritation[1,2]
Summary
The increasing demand for aesthetic restorations and the evolution of composite resins (CR) have encouraged the use of these materials in posterior teeth When they are associated with adhesive systems in deep dentin without a protection of the pulpodentin complex, they are an important factor contributing to pulpal irritation[1,2]. One or more carboxylic or phosphate groups may be incorporated into these self-etching adhesive systems, and studies have shown that they exhibit enamel and dentin bond strength similar to that of total acid etching (etch and rinse) adhesive systems[11,12] These adhesive systems have shown promising results, to date few studies have evaluated the composite resin bond to glass ionomer cements when using these materials. The null hypothesis was that the type of adhesive system did not interfere with the bond strength of a composite resin to different glass ionomer cements
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