Figure 6. Low-magnification photographs of the buccolingual section of the dehiscence defects of periodontal tissue in the (a) CTL, (b) COL, and (c) COL/CELL groups, along with high-magnification photographs from the sites of the dehiscence defects of periodontal tissue in the (A) CTL, (B) COL, and (C) COL/CELL groups. The newly formed PDL did not differ across the 3 groups (hematoxylin-eosin stain).

Ce: cementum, PDL: periodontal ligament, AB, alveolar bone, CTL group: sham control group, COL group: collagen matrix group, COL/CELL group: PDL progenitor cells with collagen matrix group.