Fig. 2From: Tomographic evaluation of the influence of the placement of a collagen membrane subjacent to the sinus mucosa during maxillary sinus floor augmentation: a randomized clinical trialT0, lateral view of a no-membrane CBCT; Z, line drawn following the floor of the nose; ZW (sinus extension), distance evaluated on the line Z between the two intersection points with the mesial and distal sinus bone walls; T0 Z-Area, area delimited by the sinus bone walls and the line ZBack to article page