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

Table 3 Descriptive statistics of the second test series. The values show the percentage of demineralization (= black pixels) in a defined image section of the respective analysis surfaces (S0—S4) after first 8 h of demineralization and subsequent remineralization for 2 min with the different toothpastes (Karex, Elmex and Ajona) as well as final 2 h demineralization

Surface	Number	Median (%)	25^th percentile (%)	75^th percentile (%)	Min/Max (%)
S1 = only demineralization with lactic acid	57	14.87 ^a	13.90	15.70	11.44/18.37
S2 = demineralization with lactic acid + remineralization with Karex	57	13.46 ^b	12.10	14.80	9.94/16.76
S3 = demineralization with lactic acid + remineralization with Elmex	57	6.29 ^c	5.63	7.34	3.91/8.87
S4 = demineralization with lactic acid + remineralization with Ajona	57	11.90 ^d	10.30	13.40	8.49/14.99

Values with different superscript letters were statistically different at p < 0.001 (Kruskal–Wallis test)

ISSN: 1746-160X