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| Group | 1 | 2 | 3 | 4 | 5 | |||||
| n | % | n | % | n | % | n | % | n | % | |
| AM | 0 | 0 | 1 | 5 | 13 | 65 | 5 | 25 | 1 | 5 |
| AC | 0 | 0 | 0 | 0 | 3 | 15 | 7 | 35 | 10 | 50 |
| LM | 7 | 35 | 8 | 40 | 3 | 15 | 2 | 10 | 0 | 0 |
| LC | 1 | 5 | 3 | 15 | 10 | 50 | 6 | 30 | 0 | 0 |
| AM (acid etching/ metal brackets), AC (acid etching/ ceramic brackets), LM (laser etching/ metal brackets) and LC (laser etching/ ceramic brackets). | ||||||||||
