Effects of Dentifrices With Antierosive Potential on the Surface of Bovine Enamel Submitted to Acidic Beverage.

Objectives: To evaluate the effects of dentifrices containing sodium fluoride (NaF) combined with NovaMin (Sensodyne Repair & Protect-SRP), NaF combined with stannous fluoride (SnF₂, Oral-B Pro-Gengiva-OBP), and amine fluoride (AmF, Colgate Elmex-ELM) on enamel subjected to simulated erosive cycling.

Materials and methods: Bovine enamel-dentin discs (n = 10/group) were subjected to erosive cycling with orange juice (pH = 3.29, 5 min, 3x/day), artificial saliva (SA-2 h, 3x/day and overnight) and treated with dentifrice (2 min, 2x/day) or without treatment (CONT). Surface microhardness (SMH) was evaluated at baseline (T₀), on the first (T₁) and fifth (T₅) days. SMH loss (%SHL) was calculated. Surface roughness (Ra, μm) was determined at T₀ and T₅. Morphology and mineral content were evaluated under scanning electron microscopy and energy-dispersive x-ray spectroscopy. Data were analyzed using ANOVA/Tukey or Bonferroni (α = 5%).

Results: No differences in %SHL were detected among groups at T₁. At T₅, OBP promoted %SHL, Ra, and ΔRa significantly lower than all the other groups (p < 0.05). All groups exhibited morphological changes in topography and similar Ca/P means before and after treatments.

Conclusions: Dentifrice containing SnF₂ minimized the negative effects on the SMH and Ra caused by exposure to orange juice after 5 days of simulated cycling.

Clinical relevance: Patients who are more exposed to risk factors for dental erosion could benefit from the use of dentifrice containing SnF₂.