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Table 4 Classification of mandibular third molar based on the Pell and Gregory and the Winter’s criteria

From: Risk of lingual nerve injuries in removal of mandibular third molars: a retrospective case-control study

Classification Number %
Inclination of the longitudinal axis of the molar
 Distoangular 8 30.8
 Horizontal 8 30.8
 Mesioangular 5 19.2
 Vertical 3 11.5
 Inverted 1 3.8
 Linguoangular 1 3.8
 Buccoangular 0 0
Depth (with respect to occlusal plane)
 Position A 7 26.9
 Position B 18 69.2
 Position C 1 3.8
Available space (with respect to ascending mandibular ramus)
 Class I 6 23.1
 Class II 16 61.5
 Class III 4 15.4
IA 1 3.8
IIA 6 23.1
IIIA 0 0
IB 5 19.2
IIB 9 34.6
IIIB 4 15.4
IC 0 0
IIC 1 3.8
IIIC 0 0
  1. The twenty six cases evaluated by orthopantomography were divided according to the Winter’s classification and the Pell and Gregory classification