Table 3. ANOVA for color and surface roughness .
| Color | Surface roughness | ||||||
| df | Mean square | F | P | Mean square | F | P | |
| Material | 1 | 5.367 | 1.525 | 0.219 | 4.612 | 3.878 | 0.051 |
| Polishing | 3 | 1.967 | 0.559 | 0.643 | 17.355 | 14.595 | < .001 |
| Bleaching | 1 | 0.121 | 0.034 | 0.853 | 2.622 | 2.205 | 0.140 |
| Material*Polishing | 3 | 6.344 | 1.803 | 0.150 | 2.728 | 2.294 | 0.081 |
| Material*Bleaching | 1 | 0.595 | 0.169 | 0.681 | 2.288 | 1.924 | 0.168 |
| Polishing*Bleaching | 3 | 1.771 | .503 | 0.681 | 1.280 | 1.076 | 0.362 |
| Material*Polishing*Bleaching | 3 | 4.091 | 1.163 | 0.327 | 0.642 | 0.540 | 0.656 |
| Error | 128 | 3.519 | 1.189 | ||||