Effect of GSE Addition in GICs on Its Adhesion to Bovine Dentin

The aim of the present study was to evaluate microshear bond strength between bovine dentin and glass ionomer cement (GIC) modified with the addition of grape seed extract (GSE).

Twenty-four crowns of bovine incisor teeth were fixed with self-curing acrylic resin, leaving the buccal surface of the teeth exposed. The enamel surface was removed with SiC abrasive paper, exposing the dentin. Four transparent cylindrical matrices (1 mm high and 0.75 mm in internal diameter) were placed on the dentin surfaces of each tooth. The control groups were composed of the GICs Maxxion R and the GC Gold Label 9 R used in the proportion recommended by the manufacturers. For the experimental groups, GSE was added to the GIC liquid in the form of 10% glycolic extract. The set was stored at an absolute humidity of 37°C for 24 h. After storage, matrices were removed, and specimens were submitted to the microshear bond test.

Data were submitted to two-way ANOVA and Tukey's test (α = 0.05).

The mean bond strength values did not exhibit statistically significant differences for different groups. For the independent factor material, the average bond strength values were significantly higher for GIC GC Gold Label 9 R (6.15 MPa) when compared to Maxxion R (3.93 MPa).

The incorporation of GSE into GIC did not negatively interfere with the adhesive properties of the GIC; the prevalence of the adhesive failure pattern was observed in all tested groups.