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Table 2 Radiographic evaluation (lesion)

From: Microsurgical endodontic treatment of the upper molar teeth and their relationship with the maxillary sinus: a retrospective multicentric clinical study

Relationship between the lesion and the maxillary sinus membrane

Distance > 3 mm

L1

Distance < 3 mm but not in contact

L2

In contact with the maxillary sinus

L3

Inside the maxillary sinus

L4