Time

Dentin surface region numbers

Chi-square

value

p-value

1

2

3

4

A (0 s)

3 (152)a

3 (162)

3 (158)

4 (162)

45.8

<0.005

B (20 s)

10 (124)

10 (110)

12 (104)

15 (132)

C (40 s)

24 (110)

28 (120)

29 (132)

34 (125)

D (60 s)

90 (103)

95 (105)

104 (112)

101 (112)