Table 2 CIE L*, a*, and b* parameters, and ΔE following bleaching

ProRoot

10

73.3 (2.30)^a

78.18 (1.50)^a

79.27 (0.94)^a

81.00 (1.29)^a

Retro

10

76.7 (0.97)^b

78.71 (1.46)^a

79.39 (0.94)^a

81.55 (1.05)^a

MTA removal

1 week

2 weeks

3 weeks

Groups

n

a₀

a₁

a₂

a₃

ProRoot

10

1.54 (0.63)^a

0.72 (0.59)^a

−0.08 (0.63)^a

−0.17 (0.58)^a

Retro

10

2.68 (0.73)^b

1.02 (0.66)^a

−0.04 (0.67)^a

−0.23 (0.55)^a

MTA removal

1 week

2 weeks

3 weeks

Groups

n

b₀

b₁

b₂

b₃

ProRoot

10

17.65 (2.61)^a

20.81 (1.75)^a

19.13 (1.48)^a

18.03 (1.63)^a

Retro

10

20.47 (2.33)^b

21.80 (1.50)^a

20.44 (1.79)^a

19.49 (1.46)^a

MTA removal

1 week

2 weeks

3 weeks

Groups

n

ΔE₀

ΔE₁

ΔE₂

ΔE₃

ProRoot

10

27.82 (13.44)^a

12.38 (8.49)^a

10.22 (4.79)^a

10.73 (4.29)^a

Retro

10

19.77 (12.33)^b

19.58 (20.16)^a

16.51 (15.77)^a

13.53 (15.78)^a