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.