| Variables | Number | Percentage |
| Alternative to fixed attachment | ||
| Yes | 19 | 33.3% |
| NO | 38 | 66.7% |
| Limited involvement of the orthodontist in treatment | ||
| Yes | 18 | 31.6% |
| NO | 39 | 68.4% |
| Profitability | ||
| Yes | 28 | 49.1% |
| No | 29 | 50.9% |