Designs of the posterior palatal seal

By Dr.Swathi Pai on Wednesday, January 7, 2009 with 0 comments

Describe six of the most common Posterior palatal seal configuration described by Winland and Young.

  1. A bead posterior palatal seal

  2. A double bead posterior palatal seal

  3. A butterfly posterior palatal seal

  4. A butterfly posterior palatal seal with a bead on the posterior limit

  5. A butterfly posterior palatal seal with the hamular notch area cut to half the depth of a #9 bur

  6. A posterior palatal seal constructed in reference to House’s classification of palatal forms;

How did Silverman place the posterior palatal seal on the maxillary cast?

The cast was scored as follows: A pencil line was scribed from the hamulus to hamulus midway between the anterior and posterior flexion lines. A groove was made in the cast along the line to a depth of 1-2mm. A shallow scratch mark was placed on the anterior flexion line, and the posterior flexion line was scored to a depth one half that of the midscore line. The entire seal area was scraped so that the anterior segment on the cast sloped from the scratch mark anteriorly to the deepest portion at the midline. The depth of the cast scraping diminishes from the midline to the posterior vibrating line.

What was the effect of the scraping?

To allow the seal area on the denture to slightly displace the soft palate with a convex surface.

Category: Prosthodontics Notes



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