Table 4 Mean color differences and standard deviations after staining (ΔE_00st-i), bleaching (ΔE_00bl-st), and the residual difference compared to baseline (ΔE_00bl-i)

0.84 ± 0.06^Aa

0.81 ± 0.08^Aa

3.09 ± 0.18^Ab

2.56 ± 0.41^Bb

2.84 ± 0.38^Abc

2.42 ± 0.26^Bb

2.47 ± 0.39^Ad

2.13 ± 0.17^Bc

2.74 ± 0.35^Acd

2.29 ± 0.34^Bbc

0.81 ± 0.08^Aa

0.79 ± 0.08^Aa

2.44 ± 0.34^Ab

1.89 ± 0.53^Bb

2.22 ± 0.26^Abc

1.75 ± 0.46^Bc

2.12 ± 0.19^Ac

1.54 ± 0.41^Bc

2.34 ± 0.29^Abc

1.76 ± 0.53^Bbc

0.72 ± 0.06^Aa

0.68 ± 0.05^Aa

1.95 ± 0.28^Ab

1.31 ± 0.25^Bb

1.93 ± 0.36^Ab

1.43 ± 0.37^Bbc

1.83 ± 0.33^Ab

1.21 ± 0.19^Bc

1.94 ± 0.37^Ab

1.41 ± 0.29^Bbc