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

Objectives: To evaluate the effect of a tin-containing fluoride (Sn/F) mouth rinse on microtensile bond strength (μTBS) between resin composite and erosively demineralised dentin. Materials and Methods: Dentin of 120 human molars was erosively demineralised using a 10-day cyclic deand remineralisation model. For 40 molars the model comprised erosive demineralisation only, for another 40 the model included treatment with 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. SiC paper ground, non-erosively demineralised molars served as control (n=20). Subsequently, μTBS of Clearfil SE/Filtek Z250 to the dentin was measured and failure mode determined. Additionally, surfaces were evaluated by SEM and EDX. Results: Compared to the non-erosively demineralised control, erosive demineralisation resulted in significantly lower μTBS regardless of the removal of demineralised organic matrix. Treatment with NaF increased μTBS, but the level of μTBS obtained by the non-erosively demineralised control was only reached when the demineralised organic matrix had been removed. The Sn/F mouth rinse led to significantly higher μTBS than did the non-erosively demineralised control, both with or without removal of demineralised organic matrix. The Sn/F mouth rinse yielded higher μTBS than did the NaF solution. Conclusions: Treatment of erosively demineralised dentin with a NaF solution or a Sn/F mouth rinse increased the bond strength of resin composite. Clinical Relevance: Bond strength of resin composite to eroded dentin was not negatively influenced by treatment with a tin-containing fluoride mouth rinse.