Posterior palatal seal

1. POSTERIOR PALATAL SEAL
Preeti Kalia
Ist year PG student
Department of Prosthodontics
A.E.C.S Maaruti Dental College

2. Trouble Defnition
shooting
Purpose
Techniques
Posterior palatal Functions
seal
Soft palate Anatomic
considerations
Anterior and Physiologic
posterior vibrating consideration
lines

3. Definition
According 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. Functions
Retention
Reduce patient awareness
Reduce food accumulation
Reduce patient discomfort
Compensate for volumetric shrinkage

5. Anatomic considerations

6. Anatomic considerations
Posterior palatal seal divided according to
anatomic boundaries into
1) Pterygomaxillary seal
2) Post palatal seal

7. Anatomic consideration
Hamular process

8. Anatomical considerations
Maxillary tuberosity

9. Anatomic Considerations
Hamular notch

10. Anatomical considerations
Pterygomandibular raphe

11. Anatomic Considerations
Fovea palatini

12. Anatomic Considerations
Median palatal raphe

13. Anatomic considerations
Torus palatinus

14. Physiologic consideration
Saliva
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. Anterior vibrating line

16. Posterior vibrating lines

17. Classification of soft palate

18. Rationale of recording posterior
palatal seal
1) To establish positive contact
2) To serve as a guide for
positioning the impression tray
3) To create slight displacement
of the soft palate
4) To obtain adequate
retention and seal.

19. Techniques
Functional
Semi functional
Empirical

20. Conventional technique

21. Conventional technique

22. Conventional technique

23. Conventional technique
Scraping of the cast

24. V id4.mov

25. Conventional technique
Advantages
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. Conventional technique
Disadvantages
Not a physiologic technique
Potential for overcompression of tissues

27. Fluid wax technique

28. Fluid wax technique

29. Fluid wax technique
Advantages
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. Fluid wax technique
Disadvantages
More time is necessary during the
impression appointment
Difficulty in handling materials

31. Arbitrary scraping of the master
cast

32. Extended palatal technique
Proposed by Silvermann
Posterior border of the denture can be
extended by 8mm for patients with Class I
soft palate
Not accepted now

33. Establishing the posterior palatal seal
during the final impression stage
Ansari.I.H , JProsthet Dent 1997;78:324-6.

34. Selective pressure technique

35. Adding a posterior palatal seal to
the existing denture

36. Adding a posterior palatal seal to
the existing denture

37. Posterior palatal seal configuration

38. Troubleshooting
1) Underextension
2) Underpostdamming
3) Overpostdamming
4) Overextension

39. Review of literature
JacobJ, Shetty.S , Shetty.M , A semifunctional impression technique to develop
PPS and a method to visualize and confirm it by addition of heat polymerized
clear acrylic resin at the posterior border of the denture base.JIPS 2007:7;184-
187

40. Review of literature
JacobJ, Shetty.S , Shetty.M , A semifunctional impression technique to develop
PPS and a method to visualize and confirm it by addition of heat polymerized
clear acrylic resin at the posterior border of the denture base.JIPS 2007:7;184-
187

41. Review of literature
Fernendes.V, Chitre.V., Aras.M, A study to determine whether the anterior and posterior
vibrating lines can be distinguished as two separate lines of flexion by unbiased
observers: A pilot study ,Indian Journal of Dental Research 2008:19;4,335-340

42. References
Sheldon Winkler,Essentials of Complete
Denture Prosthodontics,2nd
edition,2009,A.I.B.T.S publishers and
distributors, India, pp-107-122
Charles.L.Bolender,Prosthodontic treatment
for edentulous patients,12th
edition,2003,Mosby publications,St.Louis,pp-
331-3
Deepak Nallaswamy,Textbook of
Prosthodontics, Ist edition,2003,Jaypee
publishers,New Delhi,pp-51-53,84-88

43. References
Irving R Hardy, Krishan K Kapur,Posterior
border seal-Its Rationale and Importance. J
Prosthet Dent 1958:8;3,386-397
Winland, RD and Young JM.Maxillary
complete denture posterior palatal seal:
variation in size shape and form. J Prosthet
Dent 29:256-261, 1973.
Ettinger:, R.l., Scandrett, F.R.The posterior
palatal seal. A review. Aust Dent J 25: 197-
200, 1980.

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. References
Ansari.I.H, Establishing the posterior
palatal seal during the final impression
stage, JProsthet Dent 1997;78:324-6
Jacob.J, Shetty.S , Shetty.M ,A
semifunctional impression technique to
develop PPS and a method to visualize
and confirm it by addition of heat
polymerized clear acrylic resin at the
posterior border of the denture base ,JIPS
2007:7;184-187

46. References
Fernendes.V, Chitre.V, Aras.M, A study to
determine whether the anterior and
posterior vibrating lines can be
distinguished as two separate lines of
flexion by unbiased observers: A pilot
study ,Indian J Dent Res 2008:19;4,335-
340
dentyoutube.com/dentalvideo-
php?vid=b4ab82d4