Open Access

Table II

The Pernambuco index [12].

Variable Classification Value
Level of the occlusal plane (Pell and Gregory) A 1
  B 2
  C 3
Available retromolar space (Pell and Gregory) I 1
  II 2
  III 3
Impaction angle (Winter) Vertical 1
  Mesioangular 2
  Horizontal 3
  Distoangular 4
Root curvature Non-dilacerated 1
  Dilacerated 2
Number of roots One fused root 1
  2 or more roots 2
  Tooth germ 3
Relationship to second molar No contact 1
  Contact with crown alone 2
  Contact with root 3
Age (years) ˂ 25 1
  ≥ 25 2
BMI (kg\m2) 18.5–24.9 (ideal weight range) 1
  25 and more (overweight) 2
Surgical difficulty Index score
Low 8–12
Moderate 12–17
High 18–22

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