Effect of silver diammine fluoride application on dentin bonding performance

The purpose of this study was to evaluate the effects of two different concentrations of silver diammine fluoride (SDF) on dentin bonding performance. Human mid-coronal dentin was treated with either distilled water (control), 3.8%SDF or 38%SDF for 3 min. A two-step self-etch adhesive and resin composite were applied according to manufacturer's instructions. After thermocycling (TC) at 0, 5,000 and 10,000 cycles, microtensile bond strength (mu TBS) testing and morphological assessment of resin-dentin bonding interface were performed. At 0 TC, mu TBSs of 3.8% and 38%SDF were significantly reduced (p<0.05). At 5,000 and 10,000 TC, mu TBSs of 3.8%SDF were comparable to those of the control group, whereas the mu TBSs of 38%SDF were significantly lower (p<0.05). Acid-base resistance zone formation was observed in all groups, however, slope-shaped formation was identified only in the SDF groups. The mu TBSs and interfacial morphology were influenced by concentration of SDF and also TC.