| – | Test | Control |
|---|---|---|
| Number (male/female) | 86 (48/38) | 86 (51/35) |
| Average age (range) | 15.6 (15.0 – 16.7) | 15.5 (14.7 – 16.7) |
| Orthodontic treatment | yes | no |
| Bitewing radiographs | Analog, Kodak Insight films, Speed F |
Digital, Dürr image plates 2+ & Dürr VistaScan Perio Plus image plate scanner |
| Period | 2002 – 2010, (day of debonding) |
2009 – 2014 (routine examinations) |
| Origin of radiographs | University | Private Practice |
| Anonymization | yes | yes |
| Percentage of sites not identified |
3.0% | 1.3% |