Mucogingival Junction
Pronunciation: myoo-koh-JIN-jih-val
Also written as: MGJ — Mucogingival Junction
The anatomical boundary demarcating the keratinised gingiva from the non-keratinised alveolar mucosa, visible as a scalloped line on the oral mucosa.
Full Definition
The mucogingival junction (MGJ) is a clinically significant landmark used to determine the width of attached and keratinised gingiva. It appears as a distinct color change from the pale-pink keratinised tissue to the redder, more mobile alveolar mucosa. Dental hygienists reference the MGJ when assessing mucogingival defects such as recession that extends to or beyond this boundary. In editing, 'mucogingival junction' must not be confused with the 'cemento-enamel junction' (CEJ), which is a tooth landmark rather than a soft-tissue boundary. The term appears in periodontal charting forms, surgical planning notes, and mucogingival therapy documentation.
Usage
Usage note: Typically written as a single unhyphenated compound adjective: 'mucogingival junction', not 'muco-gingival junction'. Confirm per style guide.
In Context
- "Recession extending beyond the mucogingival junction indicated a Class III Miller defect requiring surgical intervention." — Periodontal case notes
- "The proof contained 'muco-gingival junction' with a hyphen; house style requires the closed compound 'mucogingival junction'." — Copy-editing note