- - - Department of Pediatric Dentistry, School of Dentistry, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, IranUniversity ,Isfahan , Iran
- - - Department of Pediatric Dentistry, School of Dentistry, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
- - - Department of Operative Dentistry, School of Dentistry, Isfahan (Khorasegan) Branch, Islamic Azad University, Isfahan, Iran

Background: Conservative treatment of adhesive dentistry considers demineralized dentin as a bonding substrate, and utilizing silver diamine fluoride (SDF) on demineralized dentin before composite restoration, probably can be beneficial. To evaluate the effect of SDF and potassium iodide (KI) on nano leakage plus the micro tensile bond strength of composite to demineralized dentin in primary teeth.Materials and Methods: In this experimental- laboratory study, seventy-eight teeth in the micro tensile group and ninety teeth in the nano leakage group were divided into two groups with sound and demineralized dentin. Each group of teeth was divided into three separate groups. In the first group, bonding was used without pre-treatment. In the second group, the SDF was used before the bonding agent and SDF and, KI was used in the third group. Two-way ANOVA, Bonferroni's post hoc test, Mann-Whitney test and Fisher's exact test were used for data analysis. (α<۰.۰۵)Results: The lowest mean bond strength was in the SDF and KI groups in both sound (۱۰.۰ ± ۱.۹) and demineralized (۶.۸ ± ۲.۳) dentin groups. Using KI significantly reduced bond strength (P <۰.۰۵). Nano leakage in teeth with sound and demineralized dentin in both SDF and SDF and KI groups was significantly lower than in the control groups (P <۰.۰۵).  Conclusion: Using SDF does not harm composite bond strength to primary teeth, but using KI after SDF reduces composite bond strength. The use of SDF and KI significantly reduces composite nano leakage.

silver diamine fluoride, potassium iodide, Tooth, Deciduous