The effect of a tin-containing fluoride mouth rinse on the bond between resin composite and erosively demineralised dentin

To evaluate the effect of a tin-containing fluoride (Sn/F) mouth rinse on microtensile bond strength (mu TBS) between resin composite and erosively demineralised dentin. Dentin of 120 human molars was erosively demineralised using a 10-day cyclic de- and remineralisation model. For 40 molars, the model comprised erosive demineralisation only; for another 40, the model included treatment with a NaF solution; and for yet another 40, the model included treatment with a Sn/F mouth rinse. In half of these molars (n = 20), the demineralised organic matrix was continuously removed by collagenase. Silicon carbide paper-ground, non-erosively demineralised molars served as control (n = 20). Subsequently, mu TBS of Clearfil SE/Filtek Z250 to the dentin was measured, and failure mode was determined. Additionally, surfaces were evaluated using SEM and EDX. Compared to the non-erosively demineralised control, erosive demineralisation resulted in significantly lower mu TBS regardless of the removal of demineralised organic matrix. Treatment with NaF increased mu TBS, but the level of mu TBS obtained by the non-erosively demineralised control was only reached when the demineralised organic matrix had been removed. The Sn/F mouth rinse together with removal of demineralised organic matrix led to significantly higher A mu TBS than did the non-erosively demineralised control. The Sn/F mouth rinse yielded higher mu TBS than did the NaF solution. Treatment of erosively demineralised dentin with a NaF solution or a Sn/F mouth rinse increased the bond strength of resin composite. Bond strength of resin composite to eroded dentin was not negatively influenced by treatment with a tin-containing fluoride mouth rinse.