Abstract
Objective: To present or report a case of oral-sinus communication treated by the buccal vestibular flap technique that occurred during a pre-prosthetic surgery. Case Detail: Extraction of the other elements of the maxilla was performed, resulting in inadequate communication of the maxillary sinus with the mouth, performed during the same surgical procedure, in the preparation of a vestibular flap to close this communication. Discussion: Buco-sinus communications are related to complications after tooth extractions with roots that are closely related to the sinus wall, thus the upper second molars are more affected because their roots have greater contact with the maxillary sinus floor. Final considerations: Oral-sinus communication is a relatively frequent complication in the dental field. For its treatment, some parameters related to the maxillary sinus with the other teeth must be taken into consideration in order to obtain the correct diagnosis to obtain the best prognosis for the patient.