Table 3.
Net (%) distributions of specimens with cohesive, mixed, and adhesive modes of failure in different subgroups and groups, and results of the Chi-square test
| Bleaching | Composites | Cohesive | Mixed | Adhesive | P |
|---|---|---|---|---|---|
| None (control) | Z100 | 12 (33.3) | 0 | 0 | 0.020 |
| Z250 | 11 (30.6) | 0 | 1 (2.8) | ||
| Z350 | 6 (16.7) | 3 (8.3) | 3 (8.3) | ||
| Home bleaching | Z100 | 11 (30.6) | 1 (2.8) | 0 | 0.000 |
| Z250 | 4 (11.1) | 4 (11.1) | 4 (11.1) | ||
| Z350 | 1 (2.8) | 2 (5.6) | 9 (25) | ||
| Office bleaching | Z100 | 9 (25) | 2 (5.6) | 1 (2.8) | 0.000 |
| Z250 | 12 (33.3) | 0 | 0 | ||
| Z350 | 0 | 5 (13.9) | 7 (19.4) | ||
| All bleaching methods | Z100 | 32 (29.6) | 3 (2.8) | 1 (0.9) | 0.000 |
| Z250 | 27 (25) | 4 (3.7) | 5 (4.6) | ||
| Z350 | 7 (6.5) | 10 (9.3) | 19 (17.6) | ||
| None (control) | All composites | 29 (26.9) | 3 (2.8) | 4 (3.7) | 0.031 |
| Home bleaching | 16 (14.8) | 7 (6.5) | 13 (12) | ||
| Office bleaching | 21 (19.4) | 7 (6.5) | 8 (7.4) |