title: Erosive potential of different types of grape juices.
abstract: The purpose of the present study was to evaluate the erosive potential of different types (concentrated and powdered) and commercial brands of industrialised grape juices. The pH of all five fruit drinks was measured at two time points: immediately after preparation and 24 hours later. Sixty specimens of bovine enamel were randomly allocated and immersed in different types of grape juice (n = 10) for 10 minutes four times a day for fifteen days. The enamel alteration was analysed using surface Knoop microhardness (KHN) and surface roughness (Ra) tests at baseline and on the 5(th), 10(th) and 15(th) days of the experiment. Two way ANOVA, Tukey's post hoc and Pearson's correlation tests were used for statistical analysis (α = 5%). The grape juices presented pH values ranging from 2.9 to 3.5. All of the tested juices promoted significant enamel mineral loss (p < 0.05) on the first evaluation (5(th) day of immersion) and produced a significant increase in the mean roughness from the 10(th) day on when compared to the control group (p < 0.05). By the 15(th) day, all of the beverages had produced surface roughnesses that were significantly higher than that of the control group. The results suggest that all grape juices, regardless of their commercial presentation, present erosive potential.
authors: Pediatric Dentistry Department, Universidade Cruzeiro do Sul, São Paulo, Brazil.
authors: Ginna Kércia Matos
authors: GK
authors: Gonçalves
authors: Camila de Almeida Brandão
authors: Cde A
authors: Guglielmi
authors: Fernanda Nahás Pires
authors: FN
authors: Corrêa
authors: Daniela Prócida
authors: DP
authors: Raggio
authors: Maria Salete Nahás Pires
authors: MS
authors: Corrêa
mesh_terms: D000818:Animals; D001628:Beverages; D002417:Cattle; D003743:Dental Enamel / Q000737:chemistry*; D006245:Hardness Tests; D006863:Hydrogen-Ion Concentration; D011897:Random Allocation; D013499:Surface Properties; D013997:Time Factors; D014077:Tooth Erosion / Q000209:etiology*; D027843:Vitis / Q000737:chemistry*