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Prosthodontics & Occlusion · single question

Which statement about the posterior palatal seal (PPS) is FALSE?

  1. Its anteroposterior position is determined by the location of the uvula
  2. It is placed along the vibrating line, between the anterior and posterior vibrating lines
  3. Its lateral extent runs through the hamular notches bilaterally
  4. It creates a peripheral seal that improves maxillary denture retention
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Correct answer: A. Its anteroposterior position is determined by the location of the uvula

The PPS location is determined by the vibrating line (the junction of movable and immovable soft palate, located using the 'ah' or Valsalva method) and landmarks like the hamular notches and fovea palatinae — NOT by the position or length of the uvula, which is too variable and posterior to be a reliable guide.

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