This oroantral fistula was caused by extraction of the left upper first molar.
The fistulous tract is curetted and cleaned. A buccal mucosa flap is elevated.
The buccal mucosa flap is advanced to cover the defect. It is sutured to the edges of the defect with absorbable sutures. The maxillary sinus infection was cleaned via a Caldwell-Luc approach.
A Coronal CT scan of the sinuses, showed a defect in the floor of the left maxillary antrum, corresponding to the oroantral fistula. Note the opacification of the maxillary sinus, indicating chronic infection.