Table 4. Distribution of ARI scores for each group.
| Group | n | ARI score‡ | Fisher's exact test | |||
|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | |||
| PO (polishing unglazed zirconia)-Z* | 10 | 0 | 3 | 2 | 5 | p < 0.001 |
| BR (bur roughening)-Z | 10 | 0 | 1 | 2 | 7 | |
| PP (cleaning)-S† | 10 | 0 | 4 | 2 | 4 | |
| HF (hydrofluoric acid etching)-S | 10 | 0 | 3 | 2 | 5 | |
| AA (alumina air-abrasion)-S | 10 | 0 | 2 | 1 | 7 | |
| AA (alumina air-abrasion)-Z | 10 | 8 | 2 | 0 | 0 | |
| CJ (CoJet-Sand air-abrasion)-S | 10 | 0 | 1 | 1 | 8 | |
*Z-Prime Plus; †Monobond-S.
‡ARI, adhesive remnant index, 0, No composite left on surface; 1, less than half of the composite left on surface; 2, more than half of the composite left on surface; 3, all composite left on surface, with a distinct impression of the bracket mesh. No ceramic fractures were observed in this study.