Table 4. Means (SD) of ΔEab and ÁE00 for composite resins according to the finishing and polishing system and the immersion medium.
| Experimental Groups | Control (without polishing) | Discs + felts | Rubbers + felts | |||||
|---|---|---|---|---|---|---|---|---|
| ΔEab | Filtek Z350 XT (Nanofilled) | |||||||
| Water (post-immersion) | 3.40 (0.74) A ** b | 2.23 (0.55) B * | 2.94 (0.57) A ** b | |||||
| Coffee (post-immersion) | 16.94 (4.22) A ## a | 14.34 (3.23) AB # a | 13.20 (1.64) B # a | |||||
| Estelite Omega (Suprananofilled ) | ||||||||
| Water (post-immersion) | 1.99 (0.50) A * | 1.92 (0.87) A * | 1.61 (0.31) A * | |||||
| Coffee (post-immersion) | 14.28 (1.13) A # a | 14.06 (1.22) A # a | 11.93 (1.10) B # a | |||||
| Empress Direct (Nanohybrid) | ||||||||
| Water (post-immersion) | 3.75 (1.13) A ** b | 3.65 (0.77) A ** b | 2.39 (0.68) B ** b | |||||
| Coffee (post-immersion) | 18.25 (1.64) A ## a | 15.17 (1.91) B # a | 17.31 (1.88) AB ## a | |||||
| ΔE00 | Filtek Z350 XT (Nanofilled) | |||||||
| Water (post-immersion) | 2.35 (0.47) A ** b | 1.64 (0.34) B * | 2.09 (0.36) A ** b | |||||
| Coffee (post-immersion) | 12.15 (2.78) A ## a | 10.38 (2.36) A # a | 9.82 (1.21) A ## a | |||||
| Estelite Omega (Suprananofilled ) | ||||||||
| Water (post-immersion) | 84.9 (1.3) a | 87.5 (1.5) * | 86.7 (1.4) a | |||||
| Coffee (post-immersion) | 74.0 (0.6) * | 76.8 (1.2) * | 77.3 (1.4) * | |||||
| Empress Direct (Nanohybrid) | ||||||||
| Water (post-immersion) | 2.39 (0.60) A ** b | 2.44 (0.41) A ** b | 1.68 (0.30) B ** b | |||||
| Coffee (post-immersion) | 12.96 (1.27) A ## a | 10.75 (1.36) B ## a | 12.31 (1.39) A###a | |||||
indicates significant difference among the type of finishing and polishing immersed in water by Kruskal-Wallis and Wilcoxon tests.
indicates significant difference among composite resins immersed in water, considering each system separately by Mann-Whitney and Wilcoxon tests.
indicates significant difference among composite resins immersed in coffee, considering each finishing and polishing system separately by Mann-Whitney and Wilcoxon tests.
Different capital letters indícate significant differences between finishing and polishing systems by Kruskal-Wallis and Student-Newman-Keuls tests (p<0.05). Different lowercase letters indicate intragroup significant difference immersed in distilled water or coffee by Kruskal-Wallis and Student-Newman-Keuls tests (p<0.001).