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Table 3 Mean ∆L, ∆a, ∆b values before and after aging

From: The effect of amine-free initiator system and polymerization type on long-term color stability of resin cements: an in-vitro study

Thermal aging

Test specimens

Start

5000 cycles

20,000 cycles

NX3 (LC)

L

84.64

84.27

81.81

a

− 0.27

− 0.09

− 0.37

b

6.76

6.62

6.53

NX3 (DC)

L

85.90

85.15

81.40

a

− 1.06

− 0.33

− 1.04

b

6.84

6.43

7.17

Variolink (LC)

L

83.87

85.43

83.02

a

2.19

2.17

2.35

b

7.97

8.27

7.86

Variolink (DC)

L

85.57

84.18

86.26

a

− 0.16

− 0.01

− 0.47

b

5.77

5.57

6.57

RelyX (LC)

L

86.70

85.95

87.76

a

− 0.60

− 0.65

− 0.06

b

4.72

5.24

5.42

RelyX (DC)

L

84.71

85.29

82.41

a

− 0.33

− 0.37

− 0.13

b

7.47

7.36

6.78