Table 2 Means of l, a, b, h, c, Ra variables pre, post staining and post bleaching.

From: Effect of bleaching materials on optical properties and surface roughness of discolored dental ceramics

Variable mean

group

Feldspar, sodium perborate

Feldspar, hydrogen peroxide

Emax press, sodium perborate

Emax press, hydrogen peroxide

Mean

SD

Mean

SD

Mean

SD

Mean

SD

L1

87

2.65

86

2.28

81

0.93

82

0.94

L2

78.10

2.80

78.63

1.39

82.94

2.43

83.15

1.29

L3

80.88

1.46

80.23

1.89

87.16

0.69

86.60

0.74

a1

1.15

0.33

1.26

0.19

−0.36

0.07

−0.29

0.14

a2

5

0.47

5

0.27

1

0.63

1

0.44

a3

5

0.29

5

0.20

1

0.05

0

0.10

b1

26

1.04

25

0.56

13

0.74

14

0.92

b2

37

0.61

38

0.45

17

1.92

18

1.60

b3

38.82

0.73

39.31

0.57

17.43

0.15

17.36

0.48

h1

87.34

0.77

87.07

0.40

91.59

0.24

91.81

1.10

h2

82.41

0.51

82.39

0.33

86.23

1.48

85.39

1.25

h3

82.31

0.23

82.40

0.23

88.26

0.19

88.57

0.33

c1

25.58

1.42

25.48

0.58

12.67

0.74

14.50

0.90

c2

37.66

0.61

38.00

0.41

16.72

1.94

17.65

1.64

c3

39.20

0.72

39.68

0.54

17.45

0.15

17.33

0.63

Ra1

0.362

0.44

0.351

1.09

0.358

0.75

0.370

1.15

Ra2

0.463

0.26

0.523

0.60

0.420

0.47

0.424

0.58

Ra3

0.527

0.53

0.594

0.11

0.523

0.32

0.512

0.28

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