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Table 2 Descriptive data for the number of third molars using Pell and Gregory Classification

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

  Number Percent
(a) Classification of third molars in relation to the ramus of the mandible
 Class I 0 0
 Class II 23 67.6
 Class III 11 32.4
 Total 34 100.0
(b) Classification of third molars in relation to the relative depth with respect to adjacent M2 occlusal plane
 Position A 5 14.7
 Position B 14 41.2
 Position C 15 44.1
 Total 34 100.0
(c) Classification of third molars in relation to Pederson’s difficulty index (DI)
 DI
  Minimally difficult 0 0
  Moderately difficult 26 76.5
  Very difficult 8 23.5
  Total 34 100.0
  1. Minimally difficult (DI = 3–4); moderately difficult (DI = 5–7); very difficult (DI = 8–10)