Table 1 Pre-treatment characteristics, treatment and retention regimes (Group 1: Residual overjet group; Group 2: Normal overjet group; PAE: Pre-adjusted edgewise appliance)
Variable | Group 1 (n = 42) | Group 2 (n = 40) | ||
|---|---|---|---|---|
Age pre-treatment mean (SD) | 14.27 (2.93) | 13.81 (3.15) | ||
n | % | n | % | |
Pre-treatment characteristics | ||||
Gender | ||||
Male | 18 | 43 | 19 | 48 |
Female | 24 | 57 | 21 | 52 |
Incisor relationship | ||||
Class I | 10 | 24 | 11 | 28 |
Class II div 1 | 24 | 57 | 18 | 45 |
Class II div 2 | 5 | 12 | 5 | 12 |
Class III | 3 | 7 | 6 | 15 |
Treatment phase | ||||
Extraction-based treatment | ||||
No | 20 | 48 | 13 | 33 |
Yes | 22 | 52 | 27 | 67 |
Maxillary retention | ||||
VFR | 37 | 88 | 38 | 95 |
Hawley | 4 | 10 | 2 | 5 |
Other | 1 | 2 | 0 | 0 |
None | 0 | 0 | 0 | 0 |
Subjective compliance (12 months) | ||||
Full-time | 2 | 5 | 1 | 3 |
Every night | 13 | 31 | 5 | 13 |
A few nights per week | 20 | 48 | 26 | 64 |
No wear | 6 | 14 | 8 | 20 |
Lip competency | ||||
Yes | 27 | 64 | 30 | 75 |
No | 15 | 36 | 9 | 23 |
Not recorded | 0 | 0 | 1 | 2 |