Complete Dentures – Posterior Palatal Seal

Peripheral seal is the primary means of retention for the maxillary denture. In order to maintain peripheral seal the periphery of the denture must maintain intimate contact with the mucosa during function. The posterior palatal seal is placed for two reasons, to overcome polymerization shrinkage of the acrylic resin and to maintain seal during small denture movements during function. This program illustrates one of the most common methods of establishing the posterior palatal seal.



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Complete Dentures – Posterior Palatal Seal — Course Transcript

  • 1. 26. Posterior Palatal Seal Michael Hamada, DDS Lecturer Division of Advanced Prosthodontics, Biomaterials and Hospital Dentistry UCLA School of Dentistry This program of instruction is protected by copyright ©. No portion of this program of instruction may be reproduced, recorded or transferred by any means electronic, digital, photographic, mechanical etc., or by any information storage or retrieval system, without prior permission.
  • 2. Posterior Palatal Seal Introduction Purpose Palatal and Velar Anatomy House Classification Clinical Determination
  • 3. The Peripheral Seal Tongue function Cheek and labial function
  • 4. The Peripheral Seal Tongue function Cheek and labial function Seal is rarely achieved with the mandibular denture. Retention is more dependent on tongue position, floor of mouth posture and neuromuscular control.
  • 5. The Peripheral Seal Cheek and labial function Palatal function Gravity
  • 6. The Peripheral Seal Cheek and labial function Palatal function Gravity Posterior Palatal Seal
  • 7. Purpose To enhance retention & maintain the peripheral seal of the maxillary denture base by compensating for : 1) polymerization shrinkage 2) minor denture base functional movements Posterior Palatal Seal
  • 8. Palatal and Velar Anatomy Posterior Palatal Seal
  • 9. Palatal and Velar Anatomy Posterior Palatal Seal
  • 10. Palatal and Velar Anatomy Posterior Nasal Spine Nasopalatine Canal Velum
  • 11. Palatal and Velar Anatomy Posterior Nasal Spine Velum Glandular tissue
  • 12. Palatal and Velar Anatomy Posterior Nasal Spine Glandular tissue Velum
  • 13. Palatal and Velar Anatomy Posterior Nasal Spine Velum Glandular tissue
  • 14. Palatal and Velar Anatomy Posterior Nasal Spine Velum Glandular tissue
  • 15. Palatal and Velar Anatomy Posterior Palatal Seal Velum Glandular tissue
  • 16. Palatal and Velar Anatomy Posterior Palatal Seal Velum Glandular tissue
  • 17. Palatal and Velar Anatomy Posterior Palatal Seal Velum Glandular tissue
  • 18. Palatal and Velar Anatomy The Vibrating Area or Line The junction between the mobile and non-mobile portions of the soft palate
  • 19. Palatal and Velar Anatomy The Vibrating Area or Line
  • 20. The House Palatal Classification The greater the functional movement of the soft palate the less favorable the House Classification The Vibrating Area or Line
  • 21. Clinical Determination of the PPS Identify the Vibrating Area or Line Junction of the mobile and non-mobile palate “ Ah-Ah” sound Glandular tissue
  • 22. Clinical Determination of the PPS Identify the Vibrating Area or Line Glandular tissue Posterior extent of maxillary denture base ends at or just anterior to the Vibrating Line
  • 23. Clinical Determination of the PPS Use a blunt instrument to palpate the extent of the displaceable glandular tissue Mark with indelible marking stick Glandular tissue
  • 24. Clinical Determination of the PPS Transfer extent of displaceable glandular tissues to impression . . . Glandular tissue
  • 25. Clinical Determination of the PPS Transfer extent of displaceable glandular tissues to impression . . . Glandular tissue . . . and transfer to master cast in preparation for cast modification
  • 26. Clinical Determination of the PPS Develop “bead seal” by modifying cast with small rounded instrument . . . Glandular tissue . . .taking into account location and thickness of displaceable tissues
  • 27. Clinical Determination of the PPS Posterior palatal seal will be processed as a positive “bead seal” onto the palatal portion of the denture base Glandular tissue
  • 28. Clinical Determination of the PPS Posterior palatal seal will be processed as a positive “bead seal” onto the palatal portion of the denture base Glandular tissue
  • 29. Clinical Variants
  • 30. Clinical Variants
  • 31. Clinical Variants
  • 32. Clinical Variants