Table 2. Mean (SD) of surface roughness (μm) of the different types of composite resins according to the finishing and polishing system and the immersion medium.
| Experimental Groups | Control (without polishing) | Discs + felts | Rubbers + felts | ||
|---|---|---|---|---|---|
| Filtek Z350 XT (Nanofilled) | |||||
| Baseline (post-polishing) | 0.276 (0.117) A | 0.313(0.104) A | 0.339(0.123) A | ||
| Final | Water (post-immersion) | 0.381 (0.221) a | 0.416(0.153) a | 0.457(0.242) * a | |
| Coffee (post-immersion) | 0.425 (0.209) * a | 0.449(0.118) * a | 0.385(0.186) * a | ||
| Estelite Omega (Suprananofilled ) | |||||
| Baseline (post-polishing) | 0.306(0.143) A | 0.416(0.153) B | 0.464(0.144) B | ||
| Final | Water (post-immersion) | 0.223(0.085) a | 0.467(0.149) a | 0.665(0.253) a | |
| Coffee (post-immersion) | 0.254(0.143) a | 0.576(0.251) a | 0.521(0.155) a | ||
| Empress Direct (Nanohybrid) | |||||
| Baseline (post-polishing) | 0.185 (0.114) A | 0.317 (0.094) B | 0.385 (0.093) B | ||
| Final | Water (post-immersion) | 0.139 (0.054) a | 0.325 (0.137) a | 0.431 (0.103) a | |
| Coffee (post-immersion) | 0.237 (0.141) a | 0.267 (0.090) a | 0.433 (0.126) a | ||
*
indicates significant difference in relation to the post-polishing value by Mann-Whitney. Equal lowercase letters indicate no significant difference between specimens immersed in distilled water or coffee by Mann-Whitney.
Different capital letters indícate a significant difference between finishing and polishing systems by Kruskal-Wallis and Student-Newman-Keuls tests.