The aim of the present study was to determine the abrasivity of 15 dentifrices, using Einlehner AT 1000 equipment. A solution containing 50 g of dentifrice and 800 ml of distilled water was placed in the equipment, at 174.000 revolutions of the metal stem, with a disposable rubber cylinder on a previously weighed copper screen (P1), for 100 min. After the procedure was over, the screen was washed, dried, and weighed again (P2). The number of g/m2 was found by using the equation: (P1-P2) ÷ 3,07 x 10-4. Each dentifrice was tested three times, and the final value was the average of the three tests. In addition, the pH and the percentage of solids of different products were investigated. The results showed that dentifrices have variable degrees of abrasivity. The three most abrasive products were: "Close Up Com Flúor", "Colgate Antitártaro", both with silicium oxide, and "Oral B Dentes e Gengivas". The three least abrasive products were: "Colgate M.F.P. Com Cálcio", "Gessy Com flúor" and "Signal com Flúor", all containing calcium carbonate. "Close Up Com Flúor", "Kolynos Ação Total", and "Oral B Dentes e Gengivas" had low pH (less than 7), a feature that may lead to an erosive effect. Further studies are necessary to compare these results with internationally available dentifrices.
Abrasivity; Oral hygiene; Toothbrushing
