Evaluation of the Effect of Silver Diamine Fluoride Treatment with and without Glutathione and Potassium Iodide on the Micro-Shear Bond Strength of Composite Resin to Primary Tooth Dentin

Abstract

Background: The present study was designed and conducted to determine the effect of silver diamine fluoride (SDF) treatment, with and without glutathione and potassium iodide, on the micro-shear bond strength of composite resin to primary tooth dentin. Materials and Methods: An in vitro experimental design was used with 52 sound extracted primary teeth randomly divided into four groups (n = 13): (a) control (no SDF), (b) SDF, (c) SDF+KI, and (d) SDF+GSH. Demineralized dentin was prepared and treated per group protocol. All samples received total-etch adhesive (Single Bond 2) and Z250 composite resin restorations. Micro-shear bond strength was measured using a universal testing machine at a crosshead speed of 1 mm/min until failure. Data were analyzed using one-way ANOVA and Tukey post hoc tests (α = .05). Results: Significant differences in mean μSBS were observed among groups, F(3, 48) = 14.27, p < .001. The control group demonstrated the lowest bond strength (8.24 ± 1.31 MPa), whereas the SDF (15.34 ± 3.72 MPa), SDF+KI (14.68 ± 3.96 MPa), and SDF+GSH (14.51 ± 2.97 MPa) groups exhibited significantly higher values (P < .001 for all vs. control). No significant differences were found among the SDF-treated groups (P > .90). Conclusion: Given that the application of SDF, SDF combined with glutathione, and SDF treatment with potassium iodide before composite restoration enhances bond strength, it is recommended to use these treatments.