Fig. (8) Histological findings in furcation defect at 4 weeks for control group. (A) Alveolar bone was slightly formed at the bottom of the defect. In contrast, connective tissue mainly formed in the defect. (B) Higher magnification image of the framed area (1) in (A). Periodontal ligament-like tissue was rebuilt in the apical area along with new alveolar bone. (C) Higher magnification image of the framed area (2) in (A). Cementum-like tissue was slightly formed in the notch. CT, connective tissue; PB, preexisting bone; NB, new bone; NC, new cementum-like tissue; PL, periodontal ligament-like tissue; R, root; arrowheads, apical notches. Staining: hematoxylin and eosin (A, C) and Masson’s trichrome (B). (Scale bars represent 1 mm (A) and 100 µm (B, C)).