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The primary function of posterior palatal seal is to:

 # The primary function of posterior palatal seal is to:
A. Retention of upper denture by making a complete seal
B. Aid in insertion and removal of the upper denture
C. Achieve balanced occlusion
D. Retention of lower denture



The correct answer is A. Retention of upper denture by making a complete seal.

The primary purpose of PPS is the retention of the maxillary denture. PPS creates a partial vacuum beneath the maxillary denture. This partial vacuum is activated only when horizontal or tipping forces are directed against the denture base. The duration of this vacuum is small and so little or no irreversible alterations to the underlying mucosa will take place.


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