Assessment of the Shear Bond Strength Between Nanofilled Composite Bonded To Glass-Ionomer Cement Using Self-Etch Adhesive With Different Phs and Total-Etch Adhesive

Statement of the problem: in the sandwich technique, the undesirable bond between the composite resin and glass-ionomer cement (gic) is one of the most important factors which lead to the failure of restoration. total-etch and self-etch adhesives may improve the bond strength based on their ph. purpose: the purpose of this study was to evaluate the shear bond strength between the nanofilled composite resin and gic using different adhesives. materials and method: in this experimental study, 40 specimens (6×6mm) in 4 groups (n=10) were prepared in acrylic mold. each specimen contained conventional gi chemfil superior with a height of 3mm, bonded to z350 composite resin with a height measured 3mm. in order to bond the composite to the gi, the following adhesives were used, respectively: a: mild clearfil se bond self-etch (ph=2), b: intermediate optibond self-etch (ph=1.4), c: strong adper prompt l-pop (ph=1), and d: adper single bond 2 total-etch (ph=7.2). the shear bond strength was measured by using universal testing machine with a crosshead speed of 1mm/min. one-way anova and tukey’s test were used to analyze the data (p< 0.05). results: the shear bond strength in group a was significantly higher than group b (p= 0.002), c (p< 0.001), and d (p< 0.001). moreover, the shear bond strength of groups a and b (self-etch) was significantly different from group d (total-etch) (p< 0.001); and c (self-etch) with d (p= 0.024). conclusion: the results of this study showed that applying the mild self-etch adhesive between the composite and the gic results in stronger shear bond strength compared to intermediate and strong self-etch adhesives. moreover, the self-etch adhesive increased the shear bond strength between composite resin and gic more significantly than total-etch adhesive.