Statistical analysis
dentine, P.
Data were evaluated with Shapiro–Wilk normality test and due to lack of normal distribution of some groups, non-parametric tests were used. Kruskal–Wallis for comparison between groups, considering each subgroup separately, was performed for each response variable: CaR, DSL and dColl. Post hoc Dunn’s test was used, and the p-value corrected for multiple comparisons was considered. To assess the dual effect of the solutions acting directly on dentine or on the pellicle, each group was then analyzed with Mann–Whitney U test comparing the subgroups D and P. Significance level was set at 5% and the analyses were performed with GraphPad Prism 7 for Mac.