Dr. Devi Dpt. Of Prosthodontics Amrita School Of Dentistry, Kochi

1. JOURNAL CLUB
Presented by
Dr. Devi
3rd Yr
24-7-’17

2. About the Article...
Australian Dental Journal. August. 1980
; Volume 15, No. 4
Ronald L. Ettinger, & Forrest R.
Scandrett, College of Dentistry. The
University of Iowa. IOWA CITY. U.S.A.

3. CONTENTS
•Introduction
•Review of article –
- Anatomy
- Different techniques to record the PPS
•Other recording methods
•Conclusion
•References

4. Introduction
• Well fitting denture
• Peripheral border should compatible with the
muscles and tissues
• is PPS necessary ???
(A comparison bases having palatal seal of the retention of complete
denture different types of posterior William E. Avant, P J. Prosthet. Dent.
May. 1973)

5. Posterior Palatal Seal

6. • The soft tissue area limited posteriorly by the
distal demarcation of the movable and non-
movable tissues of the soft palate and anteriorly
by the junction of the hard and soft palates on
which pressure, within physiologic limits, can be
placed; this seal can be applied by a removable
complete denture to aid in its retention ( GPT 9)

7. Functions :
(1) to provide retention
(2) to prevent food from getting under the denture
base
(3) to diminish gagging
(4) to make the sunken distal border less conspicuous
to the tongue
( 5 ) to supply a thick border to counteract denture
warpage due to dimensional changes during the
curing process
(6) Creates partial vacuum when horizontal & tipping force
are applied

8. Functional Anatomy :

9. • Instruct the patient to open wide
• Causes Ptrygomandibular raphe
to be come more taut

11. • Valsalva maneuver
• Soft plate depresses

14. • Add additional layer of material and ask the patient to
perform swallowing process
• Displaces the SP superiorly with minimal down ward
pressure

15. • Retention & stability
through adhesion
/cohesion/ interfacial
surface tension(JPD
1958 Hardy & Kapar
)
• Horizontal / lateral
torquing forces
ESSENTIALS OF COMPLETE DENTURE
PROSTHODONTICS, Sheldon Winkler 2nd edition

16. • Borders should
terminate in resilient
tissues
• Muccobaccal space
• Air entry beneath the
denture
• Proper width & height

17. Post palatal seal
Pterygomaxillary
seal
PPS

19. •Occupies Pterygomaxillary notch
•Band of connective tissue present
•Ptrygomandibular fold
•Pterygoid hamulus

20. •VIBRATING LINE
• Anterior VL
•Posterior VL

21. Different techniques to record the PPS
I ) techniques
of scraping the
cast,
(2) a selective
loading
impression
technique,
( 3 ) a
physiological
impression
technique.

22. Scraping the cast technique

23. •Watt and Mac Gregor believed in
scraping a double bead,
Watt and Mac Gregor ; Designing complte
dentures. Philadelphia, W. B. Suunders
Company. 1976
(pp. x3 R6).

24. • Winland and Young" have described the six most common
posterior palatal seal configurations used in the dental schools
of the United States as :
• I . A bead posterior palatal seal.
• 2. A double bead posterior palatal seal.
• 3. A butterfly posterior palatal seal.
• 4. A butterfly posterior palatal seal with a bead on the posterior
limit.
• 5. A butterfly posterior palatal seal with hamular notch area cut to
half depth of a No: 9 bur
• 6. A posterior palatal seal seal construction in reference to
House’s classification of palatal forms
class 1 : flat: modified butterfly- 3-4mm wide
class 2 : high : modified butterfly 2-3mm wide
class 3 : intermediate - a bead

25. Selective loading technique
• Impression making under constant load and
taking into account the varying tissue
densities
(Graham. C. H. The importance of stress bearing areas in
full denture impression technique. Proc. 11th Aust. Dent.
Cong., Perth. 1948 (pp. 3-15)

26. • Mapping out the relief areas in the initial
impression
• Fitting tray with relief in foil / wax / scraping
the tray
• Undercut areas , incisive papilla, midline
suture, excessive mobile tissue areas
• low fusing compound
• Escape holes

27. Physiological posterior palatal seal
• Mouth temperature
impression wax
• Displace the soft tissues
within physiological limits

28. • BOUCHER’S

29. Conclusion
The most common problem associated with lack of
retention of the maxillary complete denture is a faulty
posterior palatal seal. Many dentures do not cover the
tuberosities. nor do they extend into the pterygomaxillary
notches. while others are extended too far posteriorly
past the vibrating line.
A careful examination of the patient's tissues helps to
delineate the anatomical boundaries of the posterior
palatal seal area so that an adequate seal can be
established.

30. References
• Avant. W. E. ~ A comparison of the retention of complete denture
bases having dill’erent types of posterior palatal seal. J. Prosthet.
Dent.. 29: 5. 484 493 (May) 1973
• Essentials of complete denture prosthodontics Sheldon Winkler
2nd edition
• Hardy, I . R.. and Kapur, K. K. ~ ~ Pohterior bordcr seiil~- i t s
rationale and importance. J. Prosthet. Dent. 8 :3. 386 3x7 (May) 1958.
• Edwards, L. F., and Boucher. C'. 0 Anatomy ofthe mouth in relation
to complete denturcc J.A.D.A.. 2Y: 3, 331 345 (Mar.) 1Y42

31. • Bylicky, tl. S. Vnrinhle approaches in obtaining ii post palatal bcal:
Description of technique. Neh Yurk J. 1)cnt.. 36: 8. 180 2K-7 (Ocl.)
1966.
• Zach, G. A., and Appleby, R. C . - Importance of hamular notch in
denture construction.-Iowa Dent. J.. 52: 4, 26 27 (Oct.) 1966.

33. PART 2