Results
The amount of calcium released (median nmol/mmBoxplots of the total amount of calcium released to the citric acid per mmThe height of the collagen layer (dColl; median µm, interquartile range) is presented in Fig. Boxplots of the degraded dentine collagen (dColl). Different lower-case letters denote significant differences between the experimental groups for the action directly on the dentine surface (D). Different upper-case letters denote significant differences between the experimental groups for the action on the salivary pellicle (P). Bar with asterisk shows significant difference between D and P within the same group.The total dentine surface loss (DSL; median µm, interquartile range) is shown in Fig. Boxplots of dentine surface loss. Different lower-case letters denote significant differences between the experimental groups for the action directly on the dentine surface (D). Different upper-case letters denote significant differences between the experimental groups for the action on the salivary pellicle (P). Bar with asterisk shows significant difference between D and P within the same group.Representative images of dentine surface loss obtained with the optical profilometer after 10 cycles.