Which of the following is NOT a boundary or component of the posterior palatal seal area?

Correct answer: C. The uvula

• A. The junction of hard and soft palate defines the region within which the seal is placed.
• B. The HAMULAR NOTCHES are the lateral terminations of the seal — the soft depressions between the maxillary tuberosity and the hamulus of the medial pterygoid plate.
• C. CORRECT. The UVULA is a mobile appendage of the soft palate lying well posterior to the seal. Extending a denture onto it would provoke gagging and immediate dislodgement on any soft-palate movement.
• D. The VIBRATING LINE marks the posterior limit, demonstrated by the patient saying 'ah'.

Note: Anatomical landmarks of the seal: hamular notch — vibrating line — fovea palatinae — hamular notch. The fovea palatinae are two small ductal pits either side of the midline, usually 1–2 mm posterior to the vibrating line, and serve as a convenient visual guide.