What Is Oroantral Fistula?

What is oroantral fistula?

Oroantral fistula (OAF) is an abnormal condition that manifests a pathological communication between the maxillary sinus and the oral cavity.


OAF mostly results from insufficient knowledge and preparation before dental procedures such as extraction of the teeth.


  • Fluid going from mouth to nose when drinking;
  • A sensation of air rushing through the socket while breathing;
  • Feeling painful when secondary sinusitis develops.


You can take following tests to diagnose the condition:

  • Extraoral and intraoral examination;
  • Patency of communication test (rinsing the mouth);
  • Valsalva test (nose blowing test);
  • Cotton wisp test;
  • Mouth mirror test;
  • Gentle suctioning test (check for hollow sound)


Your doctor may first estimate your fistula diameter. Estimation results can provide the foundation for your treatment planning, including:

  • Drug therapy;
  • Surgical procedure.

If you have any questions, please go to see a doctor for professional help.

Key words: Oroantral fistula (OAF); maxillary sinus; oral cavity; Valsalva test.

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