Figure 2.

The H&E stained histologic section of an incisor tooth and periodontal tissue of rat. Control negative group (from a to d): Normal histo-morphology of gingival and periodontal tissues. Control positive group (from e to i): e–f: Marked periodontal pocket (P), disruption of the junctional epithelium and existence of granulation tissue (G) at the insertion point and above the bone crest, disorganized bone trabeculae (BT). g–h: irregular bone surface with presence of osteoclasts involved in bone matrix cavity (black head arrows), and i: large space of the periodontal ligament filled with active fibroblast and disorganized tissue that did not attach to the cementum, (scale bar 10 μm in section a, and 20 μm in section b–e. AB: alveolar bone, PL: periodontal ligament and C: cementum.