Uso de prótese de bico na correção de defeito em gnatoteca de papagaio charão (Amazona pretrei)
Feranti, João Pedro ScusselSilva Filho, José RobertoIdalencio, RenanOliveira, Marília Teresa deSouza, Fernando Wiecheteck deBrun, Maurício Veloso
Background: Birds' beaks can be affected by a lot of abnormalities due to nutritional problems, infections, changes related to the development and trauma. Considering the treatment of fractures or other birds' beaks injuries, the use of prosthesis can be an alternative treatment. Among the numerous kind of prosthetics for this propose, homologous, synthetic and mixed are frequently used. Bird's cadavers are the suppliers of homologous prostetic. This study aims to report the treatment of a gnatotheca disjunction in a parrot (Amazona pretrei) using homologous gnatotheca prosthesis. Case: A red-spectacled parrot (Amazona pretrei) was sent to the zoo after an apprehension conducted by IBAMA, at this moment the animal was in a good clinical condition. After a few months, in a routine check of the birds for deworming and coproparasitological exam, it was observed a gnatotheca bifurcation. The specific cause was not identified. Bifurcation of gnatotheca was diagnosed in one parrot. For surgery reconstruction it was implanted homologous gnatotheca prosthesis. After pre anesthetic medication with cetamine (5 mg.kg-¹, IM) and midazolam (0.25 mg.kg-¹, IM), the animal was kept under inhalational anesthesia with isoflurane vaporized in 100% oxygen in an open circuit, using a mask. It was administered butorphanol (0.5 mg.kg-¹, IM, TID, for two days). The prosthesis was implanted using the overlap technique. The tip was withdrawn from the donor bird, measured, cut and polished using micro grinding. Then, it was cleaned with a 0.9% NaCl to posterior deployment over the residual gnatotheca. After preparing prosthesis, residual gnatotheca's edges were sanded to modeling and correct positioning of the prosthesis at the methyl methacrylate. Drillings were performed on donor and receptor fragments using a drill (nº1) to put steel wire no4 cerclages. The implant was covered with methyl methacrylate for better stability and to avoid contamination. The procedure lasted 30 min and it was uneventful. The animal returned anesthesia showing no apparent discomfort with the prosthesis. The day after the procedure, the animal showed excellent recovery with immediate return of nozzle's function, starting feeding itself with grain. The bird remained stable for 22 days. It had adapted to the prosthesis, feeding with regular ration and seeds, until it was found dead in her room due to an attack of a pampas fox that escaped from its jail. Discussion: Although injuries in birds' rhamphotheca are not uncommon, the number of professionals trained on its treatment is reduced, as well as different forms of therapy are scarce. This case report supports literature in which the use of prosthesis associated with cerclages, or depending on the case, with resin are described as a better method in matters of fixation. The rhamphotheca is a structure consisting of smooth surface, filled with branched bone fiber. These structures may be not adequately supported with cerclage wires or may be susceptible to loosening. For these reasons, it was decided to use cerclage covered with methyl methacrylate to promote better fixation and structures embedding. Unfortunately, it was not possible to follow the evolution of the patient in the long term. This report demonstrates that the proposed technique can be suitable for gnatotheca's defect correction in charão parrot and provides an excellent progress in short term.
Texto completo