Fig. 2.

a Bone height was measured mesial of the maxillary molar (Masson staining; original magnification, ×2.5). A line connecting the furcations of the neighboring molars was drawn. This black line indicates the connected furcations and was then compared with the bone height mesial of the first molar; shown is a non-operated sample indicating that this drawn line indicates the original bone height mesial; b the black line with asterisk indicates the difference between the original bone height and the reduced bone height after surgery; shown a sample from the EMD-treated group (Masson staining; original magnification, ×2.5); c diagram to show the dimensions of the three-wall defect and the measurements taken for the histomorphometrical analysis