Maxillofacial prosthesis

The oroantral fistula (OAF) is an iotrogenic or pathological communication between the oral cavity and the maxillary sinus. Depending on the location it can be classified as alveolo-sinusal palato-sinusal and vestibulo-sinusal. These kinds of communications arise mainly after extraction of posterior maxillary teeth due to the close anatomical relationship between the root apices of the molar and premolar teeth and sinus floor. In addition a fistula might originate following removal of maxillary cysts benign or malignant tumors and trauma.