Current concepts in posterior palatal seal determination/ crown and bridge dentistry

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Current concepts in posterior palatal seal determination/ crown and bridge dentistry

  1. 1. JOURNAL CLUB ON CURRENT CONCEPTS IN DETERMINING THE POST PALATAL SEAL IN COMPLETE DENTURES INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. CONTENTS • Introduction • Old concepts • New concepts • Conclusion • References www.indiandentalacademy.com
  3. 3. INTRODUCTION • Post palatal seal: This is defined as the area of the soft tissue along the junction of the hard and soft palate on which pressure with in the physiologic limits, can be applied to aid in retension- G.P.T www.indiandentalacademy.com
  4. 4. • Functions of P.P.S: • 1. to provide retention • 2. to prevent food from getting under the denture • 3. to make the distal sunken border less noticeable to the tongue • 4. to reduce the tendency to gag • 5. to provide a thickened area to the denture for added strength www.indiandentalacademy.com
  5. 5. • This p.p.s can be divided into two regions based on anatomical landmarks • 1. pterygo maxillary seal • 2. post palatal seal www.indiandentalacademy.com
  6. 6. • VIBRATING LINE: is defined as an imaginary line drawn across the posterior part of the palate marking the division between the movable and the immovable tissues of the soft palate • This can be identified when the movable tissues are in function www.indiandentalacademy.com
  7. 7. • Anterior vibrating line: this is an imaginary line lying at the junction between the immovable tissues over the hard tissues over the hard palate and the slightly movable tissues of the soft palate • Location by: • 1. phonetics: “ah” in short vigorous bursts • 2. valsalva manuever • 3. fovea palitinae www.indiandentalacademy.com
  8. 8. • Posterior vibrating line: this is an imaginary line lying at the junction of the soft palate that shows limited movement and the soft palate that shows marked movement • Located by: • 1. “ah” slowly non vigorous www.indiandentalacademy.com
  9. 9. OLD CONCEPTS • 1. Conventional method • 2. fluid wax method • 3. arbitrary cast scraping www.indiandentalacademy.com
  10. 10. Conventional method www.indiandentalacademy.com
  11. 11. Advantages:  trial base has increased retention  final adjustments during insertion are minimised  dis-advantages  technique sensitive www.indiandentalacademy.com
  12. 12. Fluid wax technique • Advantages:  it is physiologic method  chances of over compression are less  increased retention of trial base  no need for scraping of the cast • Dis adjs:  handling of the material is difficult  increased chair side time www.indiandentalacademy.com
  13. 13. Arbitrary scraping errors occurring are: 1. under extension 2. over extension 3. under postdamming 4. over postdamming www.indiandentalacademy.com
  14. 14. www.indiandentalacademy.com
  15. 15. Newer methods • 1. establishing the pps during final stage • 2. with base plate wax in final denture www.indiandentalacademy.com
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  21. 21. CONCLUSION • The location of the pps is an clinical procedure so regard less of which technique you are using its the responsibility of the clinician to determine the pps clinically but not arbitrarly www.indiandentalacademy.com
  22. 22. REFERENCES • CURRENT CONCEPTS IN DETERMINING THE POST PALATAL SEAL IN CD; BEHNOUSH RASHEDI ETAL; J.P.D; VOL-12; NO-4; 2003; 265-270 • ESTABLISHING THE PPS DURING THE FINAL IMPRESSION STAGE; IZHARUL HAQUE ANSARI; JOURNAL OF PROSTHETIC DENTISTRY; VOL-78; NO-3;1997; 324-326 • IMMIDATE MAXILLARY DENTURE BASE EXTENSION FOR PPS; YUUGI ETAL; JOURNAL OF PROSTHETIC DENTISTRY; 2000; VOL-83; 371-373 • POSTERIOR PALATAL SEAL ADAPTION: INFLUENCE ON A HIGH EXPANSION CAST; SYKORA ETAL; JOURNAL OF ORAL REHABALITATION; 23; 342-345 www.indiandentalacademy.com
  23. 23. For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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