Oroantral fistula (OAF) is an epithelialised oroantral communication (OAC). OAC refers to an abnormal connection between the oral cavity and antrum (or maxillary sinus). The creation of an OAC is most commonly due to the extraction of a maxillary (upper) tooth (typically a maxillary first molar) closely related to the antral floor (floor of the maxillary sinus). A small OAC (up to 5mm wide) may heal spontaneously but a larger OAC would require surgical closure to prevent the development of persistent ...
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