Posterior Palatal Seal

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



The posterior palatal seal creates a partial vacuum that will not operate continuously, but only when horizontal and tipping forces are in place. The vacuum is unlikely to do any damage to do any damage to the supporting or border tissues. Excessive border seal destroys the supporting tissues due to heavy pressure and the interference with vascular supply.

A. Advantages

  1. Provides a close contact of the denture with the mucous membrane which prevents food from getting underneath the denture.

  2. Diminishes or eliminates gagging.

  3. Supplies sunken distal borders which are less conspicuous to the tongue.

  4. Supplies a thick border to counteract denture warpage.

B. Techniques

  1. Functional- final impression is border molded in the PPS area with soft stick compound or wax, performed by the patient.

  2. Semifunctional- border molding is done by the dentist.

  3. Empirical- PPS is developed on the cast by grooving the cast to the desired depth.

C. Methods

  1. Proper impression poured. Cast trimmed and a single thick pink base plate wax is adapted to the cast into the border roll area, labially and buccally. A hard occlusion rim is adapted to this base.

  2. Patient uses an astringent mouthwash to remove saliva and instructed to say "Ah". A mark is done at the point were there is little or no movement of the soft tissue, invariably it will include the fovea palatini. It has the disadvantage that it will often deprive the dentist of the use of ...

Category: Prosthodontics Notes

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