Oroantral Communication
An abnormal opening between the oral cavity and the maxillary sinus, most frequently arising after extraction of an upper posterior tooth.
Full Definition
An oroantral communication (OAC) occurs when the barrier between the oral cavity floor and the maxillary sinus is breached, typically during extraction of upper first or second molars whose roots approximate the sinus floor. Editors must distinguish this from an oroantral fistula (OAF), which is an epithelialised, persistent tract — the two terms are not interchangeable. OAC is a preferred abbreviation in UK oral surgery literature, whereas some North American texts favor 'oral-antral opening'. Clinical documents should specify size (in millimetres) and anatomical location to guide closure method documentation. The adjective form is 'oroantral', written as one unhyphenated word.
Usage
Usage note: Reserve 'oroantral fistula' for a chronic, epithelialised tract; use 'oroantral communication' for an acute, non-epithelialised opening. Both are written as two words.
In Context
- "A 3 mm oroantral communication was identified intraoperatively and closed primarily with a palatal rotation flap." — Operative note
- "The referral letter incorrectly used 'oroantral fistula' when the acute defect had not yet epithelialised, constituting an oroantral communication." — Editorial review comment