Abrasion
Mean enamel and dentin losses of sound and eroded specimens were computed. The
assumption of the normal distribution was analyzed by means of Kolmogorow-Smirnow and
Shaprio-Wilks tests. One-way ANOVA followed by the Scheffé post-hoc test was used to
investigate if there are differences in mean enamel or dentin loss between the different
groups of toothbrushes (p < 0.05).