Table 4. Color change values (ΔE) (Median and 25%–75% values) of the tested groups between the measurement periods.
| Groups | Water | Coffee | ||||||
|---|---|---|---|---|---|---|---|---|
| Baseline to 1W | Baseline to 6W | 1W to 6W | p | Baseline to 1W | Baseline to 6W | 1W to 6W | p | |
| Control | 1.66 (1.02–2.56) | 1.83 (1.07–2.98) | 1.94 (1.12–2.36) | 0.417 | 4.46 (2.03–5.35) | 6.01 (6.60–7.45) | 3.40 (2.71–5.74) | 0.223 |
| Modeling liquid | 0.84 (0.41–1.89)* | 1.42 (0.67–2.89)* | 1.64 (0.89–3.29)* | 0.607 | 3.03 (3.02–3.74)* | 3.11 (3.43–4.10)* | 1.74 (1.41–2.58)* | 0.021* |
| Universal adhesive | 2.95 (0.38–4.42) | 3.50 (3.67–6.48) | 3.22 (2.55–6.64) | 0.390 | 5.53 (4.60–6.34) | 5.95 (3.18–6.43) | 5.80 (4.80–6.55) | 0.882 |
| Primer | 2.98 (2.37–4.19) | 3.02 (1.33–4.93) | 3.03 (1.56–3.57) | 0.687 | 4.90 (2.65–5.50) | 4.78 (2.88–5.21) | 4.68 (2.56–4.60) | 0.607 |
| p | 0.021 | 0.045 | 0.014 | 0.019 | 0.015 | 0.017 | ||
1W, 1 week; 6W, 6 weeks,
*Represents the significant difference among the groups in each column (p < 0.05).