Protective effect of experimental mouthrinses containing NaF and TiF(4) on dentin erosive loss in vitro

OBJECTIVE: This in vitro study assessed the anti-erosive effect of experimental mouthrinses containing TiF(4) and NaF on dentin erosive loss. MATERIAL AND METHODS: Bovine dentin specimens were randomly allocated into the groups (n=15): 1) SnCl(2)/NaF/AmF (Erosion Protection(®)/GABA, pH 4.5, positive control); 2) experimental solution with 0.0815% TiF(4 )(pH 2.5); 3) 0.105% NaF (pH 4.5); 4) 0.042% NaF+0.049% TiF(4) (pH 4.4); 5) 0.063% NaF+0.036% TiF(4) (pH 4.5); 6) no treatment (negative control). Each specimen was cyclically demineralized (Sprite Zero, pH 2.6, 4x90 s/day) and exposed to artificial saliva between the erosive challenges for 7 days. The treatment with the fluoride solutions was done 2x60 s/day, immediately after the first and the last erosive challenges of the day. Dentin erosive loss was measured by profilometry (μm). The data were analyzed using Kruskal Wallis/Dunn tests (p<0.05). RESULTS: Mouthrinses containing TiF(4 )or Sn/F were able to show some protective effect against dentin erosive loss compared to negative control. The best anti-erosive effect was found for experimental solution containing 0.0815% TiF(4) (100% reduction in dentin loss), followed by 0.042% NaF+0.049% TiF(4) (58.3%), SnCl(2)/NaF/AmF (52%) and 0.063% NaF+0.036% TiF(4) (40%). NaF solution (13.3%) did not significantly differ from control. CONCLUSION: The daily application of experimental mouthrinse containing TiF(4) and NaF has the ability to reduce dentin erosion, as well as Erosion Protection(®) and TiF(4) alone.