Table 8 Comparison of ∆b*values for all study groups

Control

∆b*

− 0.42 ± 0.69

0.58 ± 0.55

0.020*

^cp

0.197

0.051

Yellow

∆b*

0.10 ± 0.48

− 0.13 ± 0.32

0.226

^cp

0.529

0.233

Green

∆b*

0.35 ± 0.45

0.10 ± 0.27

0.161

^cp

0.039*

0.255

White

∆b*

0.53 ± 0.26

− 0.05 ± 0.25

<  0.001*

^cp

<  0.001*

0.531

Blue

∆b*

0.05 ± 0.40

0.06 ± 0.36

0.937

^cp

0.695

0.587

Reddish-Brown

∆b*

−3.60 ± 0.55

− 3.02 ± 0.73

0.061

^cp

< 0.001*

< 0.001*

^bp

F:109.131, p < 0.001*

F:84.171, p < 0.001*

p

p

Control vs. yellow

0.578

0.044*

Control vs. green

0.043*

0.610

Control vs. white

0.004*

0.114

Control vs. blue

0.897

0.417

Control vs. reddish-brown

< 0.001*

< 0.001*