Table 4 ∆E values according to time and composites

Group

Mean ± SD

Mean ± SD

Mean ± SD

Mean ± SD

FBF (Coffee)

9.74 ± 0.96^{A, a}

14.32 ± 4.55^{A, a,b}

14 ± 1.27^{A, b}

15.21 ± 1.49^{A, b}

FBF (Distilled Water)

1.05 ± 0.33^{B, a}

09.6 ± 0.31^{B, a}

1.03 ± 0.33^{B, a}

1.14 ± 0.39 ^{B, a}

CBF (Coffee)

13.24 ± 0.91^{C, a}

15.57 ± 0.69^{A, b}

17.47 ± 1.22^{C, c}

18.24 ± 0.9 ^{C, c}

CBF (Distilled Water)

1.28 ± 0.12^{B, a}

1.92 ± 0.19^{B, C,D, b}

2.24 ± 0.23^{A, B,b, c}

2.43 ± 0.22^{A, B,c}

EBF (Coffee)

5.52 ± 0.58^{D, a}

6.35 ± 1.29^{C, a,b}

6.77 ± 0.74^{A, D, b}

7.46 ± 0.82^{A, D,c}

EBF (Distilled Water)

1.36 ± 0.60^{B, E,a}

1.58 ± 1.26^{B, C,a}

1.33 ± 1.21^{B, D,a}

1.66 ± 1.39^{B, D,a}

XB (Coffee)

9.30 ± 0.93^{A, a}

11.69 ± 1.6^{D, b}

13 ± 1.4^{A, c}

14.15 ± 1.62^{A, d}

XB (Distilled Water)

1.37 ± 0.47^{B, F,a}

1.57 ± 0.45^{B, C,a}

1.58 ± 0.46^{B, D,a, b}

1.9 ± 0.33^{B, D,b}