[Free gingival graft on an osseous bed. Study of healing with communication to the medullary space. Histological study in dogs].
The present study was carried out in order to determine possible alterations in the evolution of tissue repair and in an attempt to improve graft fixation to the recipient bed. The areas of the lower premolars were chosen as grafts beds. Free gingival autografts were placed on the denuded bone in a hemi-arch arrangement and on the opposite side we experimentally placed the graft on the recipient osseous bed which had been perforated with a 1/2 rounded bur in order to expose the marrow spaces and thus to permit communication between the repairing sources of the endosteum and the free gingival graft. Adult male dogs were used in the experiment. Animals were sacrificed at 0 and 36 hours and at 1, 2 and 4 weeks after surgery. The main finding was the presence of a young and fibrous collagen fiber bundle at the site of perforation which formed a graft-bone-periodontal ligament complex. The periosteum of the recipient bed in the surrounding area also contributed to the fixation of the graft through the connective tissue-bone interface, in addition to playing an important role during the initial healing process. The sequence of tissue repair was not impaired and, in clinical terms, the graft appeared to have become more stable and to be better adhered to the bed, as also suggested by the histologic examination.
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Faculdade de Odontología, Universidade do Rio de Janeiro.
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JP
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D000818:Animals; D001853:Bone Marrow / Q000503:physiopathology; D001861:Bone Regeneration; D004285:Dogs; D005881:Gingiva / Q000637:transplantation*; D008297:Male; D010510:Periodontal Diseases / Q000601:surgery*; D014945:Wound Healing
Enxerto gengival livre em leito ósseo. Estudo da cicatrização em comunicação com os espaços medulares, em cães: estudo histológico.