Figure 4. Biomaterial transformation during the regeneration of the periodontal complex (predominantly alveolo-desmodontal but also cemental): (a) Vestibular gingiva with biomaterial inoculated in a very deep sulcular pocket and the coronal portion of the root (40×); (b) Finely granular eosinophilic biomaterial and cellular biomaterial (200×); (c) Fibrous connective tissue, hypercellular fibroblastic area, hypercellular biomaterial and granular biomaterial (100×); (d) Old bone, new bone, cartilaginous island and hypercellular biomaterial (100×); (e) Cartilaginous regeneration of the alveolar bone, next to fibroblastic and hypercellular biomaterial (100×); (f) Old alveolar bone and attached to it, numerous delicate irregular trabeculae of new bone (100×); (g) Lip, vestibular gingiva, new bone attached to the old alveolar bone, desmodontium and coronal portion of the root (40×); (h) Old alveolar bone, new bone and gingiva (100×); (i) Chin muscles, new bone, old bone, apical periodontal tissue (40×); (j) detail from (i) highlighting a longitudinal basophilic line which marks the limit between the new and the old bone (200×); (k) old bone, desmodontium, apical part of the root, excessive cellular cementum (100×); (l) higher magnification of pulp, dentin, cellular cementum, desmodontium, old bone (200×). Hematoxylin-eosin staining.