Closure of Oro-Antral
This is a common complication, which may occur during
an attempt to extract the upper back teeth or roots
premolars & molars).

The mouth-sinus communication (
) may  be confirmed by observing the
passage of air or bubbling of blood from the post-
extraction socket  when the patient tries to exhale gently
through their nose while their nostrils are pinched
Valsalva test). If the patient exhales through their nose
with great pressure, there is a risk of causing
even though communication may not
have occurred initially, such as when only the lining
mucosa) of the maxillary sinus is present between the
tooth socket and the sinus.

Mouth-Sinus communications (
oroantral communications)
may be the result of:

  • Closeness of the root tips to the floor of the sinus
    (maxillary antrum). The bony portion above the root
    tips is often very thin or may even be absent,
    whereupon oro-antral communication is inevitable
    during extraction of the tooth, especially if the socket
    is 'cleaned' unnecessarily.

  • Extensive bone removal for extraction of an impacted
    tooth / root.

Buccal Flaps

Palatal Flaps

  • Palatal Rotational Advancement Flap most common
    (see diagram below).
  • Others include Palatal Pedicle Island Flap
  • V-shaped Palatal Flap (Krueger) &
  • Split-Thickness Palatal Flap (Ito & Hara).
Post-op Regime:

  • Buccal fat pad
  • Laser bio-stimulation (over 5 days)
  • Transplantation of a mature wisdom tooth (followed by root canal treatment of
    the tooth 5 - 6 weeks later)
  • Bony block removed from the chin and used to plug the OAC (Autogenous
    Mono-cortical Bone Blocks)


Acta Stomat Croat 2002.  Treatment of Oro-Antral Fistula.

Turk J Med Sc 2004.  Buccal Corticotomy for Closure of Oro-Antral Openings -
Case Report.

West Indian Med J 2005.  A New Surgical Management for Oro-antral
Communication. The Resorbable Guided Tissue Regeneration Membrane – Bone
Substitute Sandwich Technique.

Med Oral Patol Oral Cir Bucal 2006.  Incidence of oral sinus communications in
389 upper 3rd molar extraction.
Last Updated 11th August 2010