An unnatural communication between the maxillary sinus and oral cavity is known as Oro-antral communication. If this communication fails to close spontaneously, it gets epithelialized to form an Oro-antral fistula. The most common cause of an Oro-antral communication/fistula is the extraction of a maxillary molar or premolar. Spontaneous healing may occur in defects which are smaller in size, but for larger communications it requires immediate attention and should be treated without delay, in order to avoid sinusitis or any such further complications leading to patient discomfort.
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