The Pernambuco index .
|Level of the occlusal plane (Pell and Gregory)||A||1|
|Available retromolar space (Pell and Gregory)||I||1|
|Impaction angle (Winter)||Vertical||1|
|Number of roots||One fused root||1|
|2 or more roots||2|
|Relationship to second molar||No contact||1|
|Contact with crown alone||2|
|Contact with root||3|
|Age (years)||˂ 25||1|
|BMI (kg\m2)||18.5–24.9 (ideal weight range)||1|
|25 and more (overweight)||2|
|Surgical difficulty||Index score|
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