We studied immunolocalization of CD29, CD44, osteocalcin, and TGF-β1 in the bone tissue of the mandible of miniature pigs with extra-bone fixation of a free gingival graft. Three months after surgery, neoosteogenesis foci with high expression of the studied markers were found in the contact area of the free gingival graft with the alveolar bone. The markers were localized in the layer of external circumferential lamellae, on the surface of concentric lamellae of the growing osteons, and in the connective tissue of the Haversian canals. TGF-β1-immunopositive cells predominated in the connective tissue of the Haversian and Volkmann canals and in the adventitia and inner lining of the vascular wall. The established morphochemical patterns of osteogenous cells indicate significant reparative capabilities of a free gingival graft and allows considering it as an effective osteoinductive factor.
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