Table 2 Color values of the control group and various experimental groups incorporating Sr-PBG before and after thermocycling.

Before

Control

55.81 ± 0.25^a

− 0.30 ± 0.07^a

3.19 ± 0.42^a

3% Sr-PBG

58.63 ± 0.37^b

− 0.08 ± 0.09^b

4.22 ± 0.27^b

6% Sr-PBG

59.35 ± 0.72^c

− 0.03 ± 0.07^bc

4.45 ± 0.33^b

9% Sr-PBG

60.93 ± 0.30^d

0.04 ± 0.06^c

4.78 ± 0.30^c

After

Control

55.63 ± 0.33^a

− 0.21 ± 0.78^a

2.70 ± 0.36^a

3% Sr-PBG

59.14 ± 0.84^b

0.04 ± 0.08^b

3.51 ± 0.45^b

6% Sr-PBG

60.45 ± 0.89^c

0.13 ± 0.69^c

3.59 ± 0.51^b

9% Sr-PBG

61.90 ± 0.53^d

0.13 ± 0.04^c

3.91 ± 0.37^b