Table 1 Differences between intergroup and intragroup in terms of discoloration (\(\Delta {\text{E}}\) value) by immersion period

11.82 ± 1.17

4.00 ± 1.99

2.62 ± 0.49

39.729*

35.32 ± 5.92

− 5.769**

5.64 ± 0.60

− 2.012

2.77 ± 1.23

− 0.176

79.089*

46.25 ± 4.00

− 3.442

20.27 ± 1.93

− 16.856*

4.25 ± 0.94

− 2.870

195.709*

47.21 ± 5.61

− 0.810

26.02 ± 0.96

− 6.018**

10.36 ± 2.01

− 3.761

84.425*

49.72 ± 2.22

− 0.977

32.64 ± 1.06

− 10.410*

19.85 ± 2.21

− 8.741**

184.749*

53.74 ± 1.77

− 3.225

35.98 ± 0.42

− 9.052**

22.93 ± 0.32

− 2.113

629.352*