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Current concepts for determining the postpalatal seal in complete dentures
Behnoush Rashedi1, Vicki C Petropoulos
1Department of Restorative Dentistry, University of Pennsylvania School of Dental Medicine, Philadelphia, PA 19104-6003, USA. brashedi@pobox.upenn.edu
Purpose:
In 2001, a survey of U.S. dental schools was conducted to determine the concepts and techniques used for establishing the postpalatal seal (PPS) in a predoctoral dental curriculum.
Materials And Methods:
The questionnaire was mailed to the chairperson of the prosthodontic/restorative departments of 54 U.S. dental schools. Of these, 44 returned the completed survey, resulting in a response rate of 82%.
Results:
Results from this survey show that 80% of the schools are teaching a combination of phonation with other methods for locating the vibrating line. The 1 vibrating line concept for establishing the PPS is taught by 80% of schools; 77% of these schools locate the posterior termination of the maxillary denture on the vibrating line. Carving the PPS in the maxillary master cast is taught by 95% of the schools. Most of the schools teach the students to carve the PPS to a depth of 1.0-1.5 mm in the maxillary master cast. Compressibility of the palatal tissues is a consideration during PPS carving for 91% of the schools. The butterfly pattern is the most frequently (75%) described pattern for PPS carving.
Conclusions:
There is some variability from school to school on performing the PPS in the maxillary denture, although some trends are evident.
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