Adhesion to Dentin Contaminated With Ammonium Polyfluoride

Objectives: The objective was to evaluate the influence of the self-etching ceramic primer contaminated on dentin to the adhesion of dental adhesive.
Methods: Eighty sound human third molars were horizontally sectioned at the middle of the crown and were divided into ten groups. The adhesives were applied in each group as follows: 1)HF+H₃PO₄+SBU; 2)MEP+H₃PO₄+SBU; 3)H₃PO₄+MEP+SBU; 4)H₃PO₄+SBU; 5)HF+SBU; 6)MEP+SBU; 7)SBU; 8)HF+SEBond; 9)MEP+SEBond; and 10)SEBond. The specimen was filled with composite (Filtek Z250) and stored in artificial saliva at 37°C. After one week, the specimen was sectioned into resin-bonded dentin sticks for evaluating the microtensile test (uTBS). The data was statistically analysed using one-way ANOVA, followed by Post hoc Tukey’s HSD multiple comparisons at α<0.05.
Results: The dentin contaminated with Ammonium Polyfluoride, etch-and-rinse mode adhesive was not significantly different to the control, except for group 3)H₃PO₄+MEP+SBU showed a significantly higher bond strength than the control. In contrast, the self-etch mode adhesive significantly decreased bond strength in contaminated dentin than the control.
Conclusions: The dentin adhesion was influenced by Ammonium Polyfluoride contamination. For etch-and-rinse mode adhesive, the contamination sequence influenced the dentin adhesion, which the contamination after phosphoric acid treatment increased uTBS. For self-etch mode adhesive, the contaminated dentin decreased the adhesion on dentin. Furthermore, dentin contamination with Hydrofluoric or Ammonium Polyfluoride influenced dentin adhesion in the same direction.