Table 2.
Mean (SD) of ΔE values at different time intervals and storage media.
| Material (thickness) | Time interval | Storage media | |
|---|---|---|---|
| Water | Coffee | ||
| Conventional (2 mm) | ΔE 1 d | 2.1 (0.21)Aa | 2.86 (0.34)Ab |
| ΔE 7 d | 3.26 (0.22)Aa | 4.97 (0.54)Ab | |
| ΔE 14 d | 4.41 (0.20)Aa | 8.11 (0.46)Ab | |
| ΔE 28 d | 5.59 (0.26)Aa | 11.34 (0.56)Ab | |
|
| |||
| Bulk-fill (2 mm) | ΔE 1 d | 3.39 (0.36)Ba | 7.64 (0.58)Bb |
| ΔE 7 d | 4.03 (0.33)Ba | 11.26 (0.61)Bb | |
| ΔE 14 d | 5.14 (0.24)Ba | 13.84 (0.75)Bb | |
| ΔE 28 d | 7.57 (0.34)Ba | 17.02 (0.86)Bb | |
|
| |||
| Bulk-fill (4 mm) | ΔE 1 d | 3.12 (0.22)Ba | 8.00 (0.53)Bb |
| ΔE 7 d | 4.52 (0.24)Ba | 11.77 (0.44)Bb | |
| ΔE 14 d | 5.61 (0.28)Ca | 17.11 (0.52)Cb | |
| ΔE 28 d | 7.50 (0.35)Ca | 21.31 (0.40)Cb | |
ΔE 1 d, ΔE between 1 day and baseline; ΔE 7 d, ΔE between 7 days and baseline; ΔE 14 d, ΔE between 14 days and baseline; ΔE 28 d, ΔE between 28 days and baseline. Different lowercase letters indicate statistically significant differences between the media (P ≤ 0.05). Different uppercase letters indicate statistically significant differences between materials (P ≤ 0.05).