Table 2: The frequency (and percentage) of failure modes in the experimental groups.
| Group | Definition | Adhesive | Cohesive | Mixed |
|---|---|---|---|---|
| 1 | Control | 11 (73) | 4 (27) | |
| 2 | Air abrasion | 11 (73) | 1 (7) | 3 (20) |
| 3 | Monobond Plus | 10 (67) | 5 (33) | |
| 4 | CO2 Laser (10 W/10 mJ) | 12 (80) | 3 (20) | |
| 5 | CO2 Laser (10 W/14 mJ) | 9 (60) | 2 (13) | 4 (27) |
| 6 | CO2 Laser (20 W/10 mJ) | 11 (73) | 1 (7) | 3 (20) |