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Table 4 Results of the comparison of the analysis plots (S1—S4) from test series 1 (V1) with the corresponding analysis plots from test series 2 (V2)—Mann–Whitney U test

From: Remineralization and protection from demineralization: effects of a hydroxyapatite-containing, a fluoride-containing and a fluoride- and hydroxyapatite-free toothpaste on human enamel in vitro

Surface

Median V1 (%)

Median V2 (%)

Difference of the medians (V2-V1) (%)

S1 = only demineralization with lactic acid

11.86

14.87

3.01 a

S2 = demineralization with lactic acid + remineralization with Karex

9.89

13.46

3.57 b

S3 = demineralization with lactic acid + remineralization with Elmex

4.87

6.29

1.42 c

S4 = demineralization with lactic acid + remineralization with Ajona

8.66

11.90

3.24 d

  1. Values with different superscript letters were statistically different at p < 0.001 (Mann–Whitney U test)