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 (SnF(2), 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 (T(0)), on the first (T(1)) and fifth (T(5)) days. SMH loss (%SHL) was calculated. Surface roughness (Ra, mum) was determined at T(0) and T(5). Morphology and mineral content were evaluated under scanning electron microscopy and energy-dispersive x-ray spectroscopy. Data were analyzed using ANOVA/Tukey or Bonferroni (alpha = 5%). RESULTS: No differences in %SHL were detected among groups at T(1). At T(5), OBP promoted %SHL, Ra, and DeltaRa 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 SnF(2) 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 SnF(2).