Table 1.
Distribution of experimental groups.
| Group number | Group name | Type of surface treatment |
|---|---|---|
| Group 1 | NB-Si | No bleaching |
| Group 2 | NB-As | No bleaching + sodium ascorbate |
| Group 3 | NB-Er | No bleaching + Er:YAG laser |
| Group 4 | NB-Nd | No bleaching + ND:YAG laser |
| Group 5 | MB-CO2 | No bleaching + CO2 laser |
| Group 6 | HB-Si | Home bleaching |
| Group 7 | HB-As | Home bleaching + sodium ascorbate |
| Group 8 | HB-Er | Home bleaching + Er:YAG laser |
| Group 9 | HB-Nd | Home bleaching + ND:YAG laser |
| Group 10 | HB-CO2 | Home bleaching + CO2 laser |
| Group 11 | OB-Si | Office bleaching |
| Group 12 | OB-As | Office bleaching + sodium ascorbate |
| Group 13 | OB-Er | Office bleaching + Er:YAG laser |
| Group 14 | OB-Nd | Office bleaching + ND:YAG laser |
| Group 15 | OB-CO2 | Office bleaching + CO2 laser |
Abbreviations: NB, No Bleaching; HB, Home Bleaching; OB, Office Bleaching; Si, Single Bond 2; Nd, ND:YAG Laser; Er, Er:YAG Laser; CO2, CO2 Laser; As, Sodium Ascorbate.