Fig. 4
From: Crestal endoscopic approach for evaluating sinus membrane elevation technique

Schematic drawing showing entrance of the endoscope from the crestal osteotomy site after sinus membrane elevation to assess the integrity of the membrane
From: Crestal endoscopic approach for evaluating sinus membrane elevation technique
Schematic drawing showing entrance of the endoscope from the crestal osteotomy site after sinus membrane elevation to assess the integrity of the membrane