posterior palatal seal ppt

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Posterior palatal seal

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posterior palatal seal ppt

  1. 1. POSTERIOR PALATAL SEAL Preeti Kalia Ist year PG student Department of Prosthodontics A.E.C.S Maaruti Dental College
  2. 2. Trouble Defnitionshooting Purpose Techniques Posterior palatal Functions seal Soft palate Anatomic considerations Anterior and Physiologic posterior vibrating consideration lines
  3. 3. DefinitionAccording to GPT “It is defined as a soft tissue along the junction of the hard and soft palates on which pressure within the physiologic limits of the tissues can be applied by a denture to aid in the retention of the denture."
  4. 4. FunctionsRetentionReduce patient awarenessReduce food accumulationReduce patient discomfortCompensate for volumetric shrinkage
  5. 5. Anatomic considerations
  6. 6. Anatomic considerationsPosterior palatal seal divided according to anatomic boundaries into1) Pterygomaxillary seal2) Post palatal seal
  7. 7. Anatomic considerationHamular process
  8. 8. Anatomical considerationsMaxillary tuberosity
  9. 9. Anatomic ConsiderationsHamular notch
  10. 10. Anatomical considerationsPterygomandibular raphe
  11. 11. Anatomic ConsiderationsFovea palatini
  12. 12. Anatomic ConsiderationsMedian palatal raphe
  13. 13. Anatomic considerationsTorus palatinus
  14. 14. Physiologic considerationSaliva Presence of thick ropy saliva can create hydrostatic pressure in the area anterior to the posterior palatal seal , resulting in a downward dislodging forces
  15. 15. Anterior vibrating line
  16. 16. Posterior vibrating lines
  17. 17. Classification of soft palate
  18. 18. Rationale of recording posterior palatal seal1) To establish positive contact2) To serve as a guide for positioning the impression tray3) To create slight displacement of the soft palate4) To obtain adequate retention and seal.
  19. 19. TechniquesFunctionalSemi functionalEmpirical
  20. 20. Conventional technique
  21. 21. Conventional technique
  22. 22. Conventional technique
  23. 23. Conventional technique Scraping of the cast
  24. 24. V id4.mov
  25. 25. Conventional techniqueAdvantages Trial base is more retentive Psychologic security to the patient Practitioner can determine the retentive qualities in the finished denture Patient realizes the posterior extent which may ease the adjustment period
  26. 26. Conventional techniqueDisadvantages Not a physiologic technique Potential for overcompression of tissues
  27. 27. Fluid wax technique
  28. 28. Fluid wax technique
  29. 29. Fluid wax techniqueAdvantages Physiologic technique Over compression of tissues is avoided Posterior palatal seal is incorporated into the trial denture base for added retention Mechanical scraping of the cast is avoided
  30. 30. Fluid wax techniqueDisadvantages More time is necessary during the impression appointment Difficulty in handling materials
  31. 31. Arbitrary scraping of the master cast
  32. 32. Extended palatal techniqueProposed by SilvermannPosterior border of the denture can beextended by 8mm for patients with Class Isoft palateNot accepted now
  33. 33. Establishing the posterior palatal seal during the final impression stage Ansari.I.H , JProsthet Dent 1997;78:324-6.
  34. 34. Selective pressure technique
  35. 35. Adding a posterior palatal seal to the existing denture
  36. 36. Adding a posterior palatal seal to the existing denture
  37. 37. Posterior palatal seal configuration
  38. 38. Troubleshooting1) Underextension2) Underpostdamming3) Overpostdamming4) Overextension
  39. 39. Review of literatureJacobJ, Shetty.S , Shetty.M , A semifunctional impression technique to developPPS and a method to visualize and confirm it by addition of heat polymerizedclear acrylic resin at the posterior border of the denture base.JIPS 2007:7;184-187
  40. 40. Review of literatureJacobJ, Shetty.S , Shetty.M , A semifunctional impression technique to developPPS and a method to visualize and confirm it by addition of heat polymerizedclear acrylic resin at the posterior border of the denture base.JIPS 2007:7;184-187
  41. 41. Review of literatureFernendes.V, Chitre.V., Aras.M, A study to determine whether the anterior and posteriorvibrating lines can be distinguished as two separate lines of flexion by unbiasedobservers: A pilot study ,Indian Journal of Dental Research 2008:19;4,335-340
  42. 42. ReferencesSheldon Winkler,Essentials of CompleteDenture Prosthodontics,2ndedition,2009,A.I.B.T.S publishers anddistributors, India, pp-107-122Charles.L.Bolender,Prosthodontic treatmentfor edentulous patients,12thedition,2003,Mosby publications,St.Louis,pp-331-3Deepak Nallaswamy,Textbook ofProsthodontics, Ist edition,2003,Jaypeepublishers,New Delhi,pp-51-53,84-88
  43. 43. ReferencesIrving R Hardy, Krishan K Kapur,Posteriorborder seal-Its Rationale and Importance. JProsthet Dent 1958:8;3,386-397Winland, RD and Young JM.Maxillarycomplete denture posterior palatal seal:variation in size shape and form. J ProsthetDent 29:256-261, 1973.Ettinger:, R.l., Scandrett, F.R.The posteriorpalatal seal. A review. Aust Dent J 25: 197-200, 1980.
  44. 44. References Jacobson, T. E. and Krol, A. J, A contemporary review of the factors involved in complete retention , stability, and support.Part I.J Prosthet Dent1983 49:5-15, Jacobson, T. E. and. A contemporary review of the factors involved in complete retention , stability, and support Part II J Prosthet Dent 1983 ;49, 165-172, . Jacobson, T. E. and. A contemporary review of the factors involved in complete retention , stability, and support PartI III J Prosthet Dent 1983;49:306-313, .
  45. 45. ReferencesAnsari.I.H, Establishing the posteriorpalatal seal during the final impressionstage, JProsthet Dent 1997;78:324-6Jacob.J, Shetty.S , Shetty.M ,Asemifunctional impression technique todevelop PPS and a method to visualizeand confirm it by addition of heatpolymerized clear acrylic resin at theposterior border of the denture base ,JIPS2007:7;184-187
  46. 46. ReferencesFernendes.V, Chitre.V, Aras.M, A study todetermine whether the anterior andposterior vibrating lines can bedistinguished as two separate lines offlexion by unbiased observers: A pilotstudy ,Indian J Dent Res 2008:19;4,335-340dentyoutube.com/dentalvideo-php?vid=b4ab82d4

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