Competent closure of chronic oroantral fistula with Zenoderm

Ten patients suffered from chronic oroantral fistula had been closed with Zenoderm (lyophilized porcine dermis) covering the bony defects by 1-2 mm. The Zenoderm was covered by buccal sliding and rotating pedicle palatal flaps after complete resolution of sinusitis and/or infection of the fistula. In nine patients, competent closure of the fistula had been achieved also Zenoderm supported the flaps against negative or positive pressure from the sinus and supported the bony contour. In only one case the Zenoderm was expelled from the tissues due to infection which prevented healing of the flaps; this patient was controlled diabetic. The current study showed that Zenoderm had promising results in closing the chronic oroantral fistula.