Table 1 Mean VHN and SD of dentin surface in sound dentine, after demineralisation and after pH cycling. VHN, Vickers microhardness numbers

Group BAG

60.44 ± 6.41

13.05 ± 2.90

22.72 ± 3.91^a

9.67 ± 3.60^a

Group CPP-ACP

60.67 ± 3.53

15.60 ± 4.62

21.66 ± 3.92^a

6.06 ± 3.83^a

Group F

60.07 ± 9.95

13.35 ± 4.26

18.35 ± 5.62^a

5.00 ± 2.19^b

Group W

58.36 ± 2.82

16.82 ± 3.31

14.92 ± 3.23^b

− 1.90 ± 2.09^c

p value

0.919

0.290

0.020

< 0.001

LSD comparison

N/A

N/A

a > b

a > b > c