Table 1 Pederson’s difficulty index (DI)
Classification | Value | |
|---|---|---|
Spatial relationship | Mesioangualr | 1 |
Horizontal | 2 | |
Vertical | 3 | |
Distoangular | 4 | |
Depth | Position A | 1 |
Position B | 2 | |
Position C | 3 | |
Ramus relationship/space available | Class I | 1 |
Class II | 2 | |
Class III | 3 | |
Difficulty Index | Minimally difficult | 3–4 |
Moderately difficult | 5–7 | |
Very difficult | 8–10 | |