Vascularization and Innervation of Connective Tissue Grafts in the Treatment of Gingival Recessions: A Histologic and Immunohistochemical Study.

The goal of this study was to histologically evaluate the healing process of subepithelial connective tissue graft in humans. A sample of 16 patients with Miller Class I or II localized gingival recession defects were consecutively treated with a bilaminar technique. At baseline and after 2 months, tissue samples were taken from the donor and recipient sites. The revascularization and reinnervation of the graft were examined by means of hematoxylin-eosin and immunohistochemical techniques. After 2 months of healing, the integration of the grafted tissue was evident with the connective tissue expressing features belonging to both the recipient (cellular component) and the donor site (extracellular matrix) in the inner and superficial layers, respectively. This was accompanied by increased neovascularization and reduction in intraepithelial free nerve endings.