ABSTRACT: An OAC is an abnormal pathological communication that develops between the oral cavity and the maxillary antrum[1]. Most frequently it develops as a complication following extraction of the maxillary posterior teeth. other etiologies that results in the formation of an oro antral communication are cyst enucleation, benign tumour, resection of malignancies, orthognathic surgery, osteomyelitis and trauma. Maxillary antrum perforations of less than 5mm closes spontaneously after the formation of blood clot however if the perforation is 6mm or more surgical intervention is required to close the communication.