Table 4 Color change using WI and WI_D values, with data from the Vita Easyshade spectrophotometer measurements, for each group of treatment in different time points. The mean, standard deviation, and statistical analysis are displayed

32.19 ± 2.88

31.79 ± 3.39

0.479

11.93 ± 6.04

12.23 ± 7.65

0.789

24.91 ± 2.85

27.63 ± 4.07

0.018

25.44 ± 4.74^a

20.12 ± 7.83^a

0.011

24.65 ± 2.94

28.20 ± 3.39

0.001

25.53 ± 6.62^a

18.67 ± 6.87^a

0.001

25.53 ± 2.63

29.31 ± 3.78

0.000

24.12 ± 4.80^a

16.18 ± 6.86^ab

0.000

24.89 ± 2.69**

27.81 ± 3.31**

0.003

24.26 ± 4.66^a

18,96 ± 7.13^a

0.003