Table 2.
Adhesive remnant index scores of metal and ceramic bracket debonding at 24 h and post 5000 thermo-cycles. The control subgroups showed significantly higher ARI scores than the two experimental subgroups, which exhibited non-significant differences between them.
| Bracket Type | Sub groups | No. of Samples | ARI Scores | Statistics: Mann-Whitney | Statistics: Kruskal-Wallis | |||
|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | |||||
| Metal 24 h WS | Control | 20 | 2 | 6 (2EC) | 6 (2EF) | 6 | A* | H = 49.69 df = 2 p < 0.001 |
| BPA | 20 | 17 | 3 | 0 | 0 | B* | ||
| BCA | 20 | 20 | 0 | 0 | 0 | B* | ||
| Ceramic 24 h WS | Control | 20 | 0 | 6 | 4 (3EC) | 10 (4EF) | A* | H = 52.20 df = 2 p < 0.001 |
| BPA | 20 | 13 | 7 | 0 | 0 | B* | ||
| BCA | 20 | 20 | 0 | 0 | 0 | B* | ||
| Metal TC | Control | 20 | 3 | 7 (1EC) | 6 (2EF) | 4 | A* | H = 53.30 df = 2 p < 0.001 |
| BPA | 20 | 19 | 0 | 0 | 1 | B* | ||
| BCA | 6 (14 BF) | 20 | 0 | 0 | 0 | B* | ||
| Ceramic TC | Control | 20 | 0 | 1 | 5 (3EF) | 14 | A* | H = 57.30 df = 2 p < 0.001 |
| BPA | 20 | 15 | 4 | 1 | 0 | B* | ||
| BCA | 7 (13 BF) | 20 | 0 | 0 | 0 | B* | ||
Adhesive Remnant Index (ARI) Scores: (0): No adhesive left on the tooth, (1): Less than half of the adhesive left on the tooth, (2): More than half of the adhesive left on the tooth, (3): All adhesive left on the tooth with a distinct impression of the bracket mesh. BF: bracket failure, EC: enamel crack, EF: enamel fracture, TC: thermocycling, WS: water storage.
*Dissimilar letters indicate a statistically significant difference at p <0.05 according to Mann-Whitney multiple comparisons.