Table 2.
Two-by-two comparison of bleaching groups in relation to the mean element levels of completely set CEM cement
| P -value | ||||||
|---|---|---|---|---|---|---|
| Oxygen | Sodium | Calcium | Silicon | Carbon | ||
| Control | Sodium perborate | 0.000 | 0.002 | 0.000 | 0.262 | 0.381 |
| Control | Carbamide peroxide | 0.043 | 0.729 | 0.021 | 0.318 | 0.000 |
| Control | Hydrogen peroxide | 0.014 | 0.465 | 0.002 | 0.017 | 0.014 |
| Sodium perborate | Carbamide peroxide | 0.001 | 0.001 | 0.010 | 0.789 | 0.000 |
| Sodium perborate | Hydrogen peroxide | 0.002 | 0.000 | 0.079 | 0.002 | 0.004 |
| Carbamide peroxide | Hydrogen peroxide | 0.567 | 0.679 | 0.234 | 0.001 | 0.009 |