Skip to main content

Table 1 Pederson’s difficulty index (DI)

From: Spontaneous bone regeneration after surgical extraction of a horizontally impacted mandibular third molar: a retrospective panoramic radiograph analysis

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