UCSF

Purpose: The purpose of this study was to evaluate the shear bond strength (SBS) of various restorative materials – pure glass ionomer cement (GIC), resin-modified glass ionomer (RMGI), and resin composite to artificial carious dentin treated with silver diamine fluoride (SDF).Methods: Extracted human permanent molars were sectioned and put in demineralizing solution to create artificial carious lesions and subsequently treated with SDF and exposed to human saliva. Various restorative materials, consisting of GIC, RMGI, and composite, were placed and analyzed for differences in shear bond strengths. Statistical analysis was performed using ANOVA and a post-hoc Tukey HSD test (P<0.05). Results: ANOVA revealed statistically significant differences in the mean shear bond strengths (mean ± SD MPa) of the three groups (GIC, RMGI, composite) (P=0.020). GIC exhibited the highest shear bond strengths in MPa (11.6 ± 4.1) followed by composite (9.2 ± 3.7) and RMGI (7.7 ± 3.9). Statistically significant differences were found between mean bond strengths of GIC and RMGI (P=0.016). Failure mode analysis revealed 100% adhesive failures in the RMGI and Composite groups. GIC exhibited 53% adhesive and 47% mixed failure modes. Conclusions: Glass ionomer cement shows higher shear bond strength to SDF-treated artificial carious dentin compared to composite and resin-modified glass ionomer.