A comparison of the retention of complete denture bases having different types of posterior palatal seal with different palatal forms

Q. Abdul Khafoor, Mayada

	A comparison of the retention of complete denture bases having different types of posterior palatal seal with different palatal forms
Journal of baghdad college of dentistry
Article 1, Volume 24, Issue 2, 2012, Pages 11-17
Author
Mayada Q. Abdul Khafoor
Abstract
Background: The most common problem associated with the lack of retention of maxillary complete denture is faulty posterior palatal seal pps. The methods for achieving a pps include arbitrarily scraping the cast, selective pressure technique, and the physiologic impression technique. Material and Method: In this study forces required to dislodge a maxillary complete denture bases were compared for different types of posterior palatal seals (PPS) with different palatal forms by using a specially designed strain gauge force tranducer and strain measuring device. Nine male and female subjects are selected with age range 55-70 years. These patients with different palatal forms according to House's classification of palatal forms: Class I flat, Class II intermediate and Class III high. Using different impression technique the first ordinary impression with Zincoxide eugenol and scraping the cast for pps, the second physiological impression by using korecta wax No.4. Result: The results show very highly significant difference, between the different designs of pps and physiological impression for each group. Conclusion: The physiological impression of pps give better retention because no over compression of tissues (within the physiological limit) and concluded that the form of palate has direct influence on the retention of complete dentures and will aid in the selection of type of posterior palatal seal needed
Keywords
Maxillary complete denture; posterior palatal seal

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