The oronasal fistula repair still represents a challenge to the surgeons, due to the high incidence of recidivation. An experiment using 10 adult mongrel dogs weighting between 8 and 17 kilograms was performed in order to evaluate the in block lyophilized inorganic bovine bone cancellous (BLIBBC) in the treatment of this disease. Each dog had an exodontic procedure of both canine teeth, in order to produce an oronasal fistula. The surgical procedure realized consisted in two different surgical steps: the left side defect was repaired right after the defect have been produced, while the right side defect was repaired seven days after the fistula induction; both sides were repaired using BLIBBC and covered with gengival flap. The animals were radiological and clinicaly evaluated every week for 120 days. The material used was effective in the repair of both fistulas, without rejection or recurrence.
oral surgery; graft; dogs; lyophilized bone
