Open Access
Table I
Criteria and scores of the Pederson scale.
| Criteria | Scores |
|---|---|
| 1. Spatial relation | |
| Mesio-angular | 1 |
| Horizontal/Transverse | 2 |
| Vertical | 3 |
| Distoangular | 4 |
| 2. Ramus relation | |
| Class 1: Sufficient space | 1 |
| Class 2: Reduced space | 2 |
| Class 3: No space | 3 |
| 3. Depth | |
| Level A: high occlusal level | 1 |
| Level B: medium occlusal level | 2 |
| Level C: low occlusal level | 3 |
| Difficulty score | |
| Difficult | 7–10 |
| Moderate | 5–6 |
| Easy | 3–4 |
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