Abstract
Objective: To clarify the surgical approach of buccal-sinus fistula closure by the buccal flap technique, as well as to clarify to the dentist the main factors related to the onset of this complication. Case Study: We report the case of a female patient, 40 years old, who sought care stating "when I am eating, food comes out of my nose". During the anamnesis, the patient reported that 3 years ago she underwent extraction of the element 26 and since then she noticed the passage of fluids and food from the oral cavity to the nasal cavity. Clinical examination revealed an alveolar ridge defect as a possible attempt for physiological repair. The diagnostic hypothesis of bucco-sinus fistula was raised after extraction of the element 26, and a panoramic radiograph showing a discontinuity of maxillary sinus floor radiopacity was requested. The resolution of the case was based on the prescription of antibiotic prophylaxis and surgical treatment for buccal-sinus fistula closure by the vestibular flap technique. Patient has been undergoing dental follow-up for 3 months and so far has not relapsed. Final considerations: Oral and sinus fistulas are complications that can and should be avoided by the dentist through detailed patient planning and evaluation.