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Table 1 Radiographic evaluation (root)

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

Relationship between the root and the maxillary sinus membrane

Distance > 3 mm

R1

Distance < 3 mm but not in contact

R2

In contact with the maxillary sinus

R3

Inside the maxillary sinus

R4