Reparo do ramo bucal dorsal do nervo facial em coelhos com segmento intestinal alógeno

Abstract

18 rabbits, New Zealand race, males, adults were used for clinical and histological evaluation of repair dorsal buccal branch of facial nerve after 15, 30 and 60 days postoperatively (PO). The animals were divided into two groups of equal numbers for transection and 10-0 nylon monofilament epineural suture of buccal branch. In animals in Group I, the nerve was coated with chamber intestinal segment of jejunum allograft preserved in glycerin 98% and in group II was applied epineural suture. Nasal secretion was observed until the second week in the animals of group II and until the eighth week in the group I. In rabbits of the two groups occurred the return of response to blink reflex in the first week and the movement of the upper lip from the eighth week. After the pre-established periods of PO was noted in animals in both groups, adherence fibrous tissue adjacent to the nerve, more intense in the group I. There was infiltrated cellular and giant cells with fibrosis unsystematic and collagen fibers of the allograft conduit joing to the connective tissue. At 15 days of PO, the distal nerve stumps of both groups were found with mild degeneration wallerian. At 30 days, with intense proliferation of Schwann cells in 60 days, with scattered fibers regenerated. The repair of the dorsal buccal branch of facial nerve with the allograft conduit wasn't significantly different between the control rabbits as to the assessment of histological and functional recovery.