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The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
The posterior palatal seal  /certified fixed orthodontic courses by Indian dental academy
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The posterior palatal seal /certified fixed orthodontic courses by Indian dental academy

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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078

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  • 1. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com THE POSTERIOR PALATAL SEAL www.indiandentalacademy.com
  • 2. CONTENTS • INTRODUCTION • FUNCTIONS OF PPS • ANATOMIC &PHYSIOLOGIC CONSIDERATIONS • SOFT PALATE CLASSIFICATION • PPS FORMS • TECHNIQUES FOR ESTABLISHING PPS • TROUBLESHOOTINGS • ADDING PPS TO AN EXISTING DENTURE www.indiandentalacademy.com
  • 3. INTRODUCTION • Retention of a complete denture • Horizontal & lateral forces of maxillary denture are resisted by border seal • Peripheral seal • At the posterior aspect of maxillary denture in the area of soft palate there are no cheek tissue to seal the denture border www.indiandentalacademy.com
  • 4. DEFINITION • (G.P.T.-8) “The soft tissue area at or beyond the junction of hard and soft palates on which pressure within physiological limits can be applied by a complete removable denture prosthesis to aid in its retention” www.indiandentalacademy.com
  • 5. FUNCTIONS OF PPS “ Millsap” lists of functions of pps. 1.Primary function—retention of maxillary denture 2.Reduce the awareness of this area &gag reflux 3.Reduce food accumulation 4.Compensates volumetric shrinkage 5. Adds strength across the denture www.indiandentalacademy.com
  • 6. ANATOMIC &PHYSIOLOGIC CONSIDERATIONS • POSTERIOR PALATAL SEAL AREA POST PALATAL SEAL PTERYGOMAXILLARY SEAL www.indiandentalacademy.com
  • 7. • Hamular process It is located 2-4 mm postero medial to the distal limit of maxillary residual ridge www.indiandentalacademy.com
  • 8. FOVEA PALATINI • Two glandular openings within the tissues of posterior portion of hard palate usually lying on either side of midline • Ductal openings of palatal mucous glands • “The fovea palatini are located on average 1.31mm anterior to anterior vibrating line. Nerve concentration were found to begin just anterior to fovea& spread toward soft palate.So pps should be carefully located and scored so that no soft tissue movement can take place to initiate the gag reflux” ( T.L.Lye ;The significance of fovea palatini in complete denture prosthodontics: J PROSTHET DENT ,1975) www.indiandentalacademy.com
  • 9. FOVEA PALATINI • “ CHEN” found that a majority of subjects have fovea were located either on or behind the anterior vibrating line” • Fovea serve as only as a guide to placement for pps . • It has no function www.indiandentalacademy.com
  • 10. ANTERIOR AND POSTERIOR VIBRATING LINES • ANTERIOR VIBRATING LINE It is an imaginary line located at the junction of attached tissue overlying the hard palate and movable tissues of immediately adjacent soft palate • VALSALVA MANEUVER • VISUALLY— ‘ah’ with ‘short, vigorous bursts’ • AVL—is not a straight line www.indiandentalacademy.com
  • 11. POSTERIOR VIBRATING LINE Is an imaginary line located at the junction of the aponeurosis of tensor veli palatini muscle and the muscular portion of the soft palate. • Visualized by– ‘ah’ in short burts in a normal un exaggerated manner’ • Most distal extension of denture base www.indiandentalacademy.com
  • 12. SOFT PALATE • M.M.HOUSE classification class1-- >5mm class2- 1-5mm class3- <1mm www.indiandentalacademy.com
  • 13. PALATAL VAULT • Deep, medium, flat • Different palatal vault shapes are compared to the width of pps & concluded that width of pps in people with flat palate is greater than in people with deep or medium palate shapes • In flat palate group the vibrating line is located farther posteriorly ( H.NIKOUKARI ; A study of posterior palatal seals with varying palatal forms; J PROSTHET DENT.1975 ) www.indiandentalacademy.com
  • 14. POSTEROIR PALATAL SEAL AREA FORMS • A bead pps extending through hamular notches • A double bead pps; posterior bead is located on posterior limit of the denture • A butterfly pps ; width and depth of butterfly depends on amount of displacement of tissues • A butterfly pps with a bead on posterior limit of denture • A butterfly pps with the hamular notch area cut to half the depth of a no 9 round bur • Pps constructed in reference to House classification of palatal forms www.indiandentalacademy.com
  • 15. SINGLE BEAD BUTTERFLY DOUBLE BEAD BUTTERFLY WITH www.indiandentalacademy.com POSTERIOR BEAD
  • 16. PPS IN REF TO HOUSE CLASSIFICATION BUTTERFLY WITH HAMULAR NOTCH CUT WITH NO 9 BUR www.indiandentalacademy.com
  • 17. • Class 1; modified butterfly approximately 3-4mm wide • Class 2 ;modified butterfly approx 2-3mm wide • Class 3 ; a bead ( Roger dwinland; maxillary complete denture posterior palatal seal; variations in size, shape and location;J PROSTHET DENT ,MARCH;1973) www.indiandentalacademy.com
  • 18. • RASHEDI conducted a survey and concluded that the butterfly pattern was the most frequently described pps carved in the maxillary cast when compared to double bead or single bead pps. (Behnoush Rashedi ;current concepts for determining the post palatal seal in complete dentures; J PROSTHODONT 2003;12;265-270 ) www.indiandentalacademy.com
  • 19. TECHNIQUES FOR ESTABLISHING PPS • Rationale for positioning pps 1. To establish positive contact posteriorly 2. To serve as a guide for positioning tray 3. To create slight displacement of soft palate 4. To determine adequate retention and seal www.indiandentalacademy.com
  • 20. TECHNIQUES • CONVENTIONAL APPROACH • FLUID WAX TECHNIQUE • ARBITRARY SCRAPING OF MASTER CAST www.indiandentalacademy.com
  • 21. CONVENTIONAL APPROACH • Final impression—boxing– cast pouring—resin or shellac tray . • Patient in upright position , pps area dried with gauge • Out lining of pterygo maxillary seal area 3-4mm of area antero lateral to the tuberosity www.indiandentalacademy.com
  • 22. CONVENTIONAL • Out lining of PVL area “ah” in short burts in an unexaggerated fashion • Tray inserted into mouth • Tray is returned to master cast • Out lining of AVL “ah ’’ short vigorous burts www.indiandentalacademy.com
  • 23. • • • • • SCORING OF MASTER CAST Kingsley scraper Deepest area 1-1.5mm Mid palatal raphae 0.5-1mm Feather edge taper www.indiandentalacademy.com
  • 24. CONVENTIONAL • Advantages 1.Retentive trial denture base– accurate maxillo mandibular relations 2.Psychological security to patient 3.Dentist can determine the retentive qualities of finished denture • Disadvantages 1.Not a physiologic technique 2.Over compression of tissues is great www.indiandentalacademy.com
  • 25. FLUID WAX TECHNIQUE • • • AVL &PVL markings are transferred to final impression Zinc oxide euginol vs elastic impression materials 4 types of waxes Iowa wax --white---Dr earl s. smith korecta wax no 4— orange—Dr o.c. Applegate H.L.Physiologic paste—yellow-white---Dr C.S.Harkins Adoptol ---green—Dr Nathan g. Kaye www.indiandentalacademy.com
  • 26. FLUID WAX TECHNIQUE • Melted wax painted on to the impression within out line of pps • Impression is carried to mouth & under gentle pressure for 4-6 min • Position of head ‘Nelson’ said that for an effective pps is to be recorded without inducing tissue irritation, soft palate should be impressioned in its most functionally depressed position www.indiandentalacademy.com
  • 27. • Position of head 1. maximum depression of soft palate will be recorded when ‘frankfort plane ’is 300 below the horizontal plane & tongue is positioned firmly against mandibular anterior teeth 2.After 4-6 min impression tray is removed from mouth and wax is examined for uniform contact throught pps www.indiandentalacademy.com
  • 28. FLUID WAX TECHNIQUE • Advantages 1 physiologic technique 2 over compression is avoided 3 mechanical scraping avoided • Disadvantages 1 more time 2 difficulty in handling materials www.indiandentalacademy.com
  • 29. ARBITRARY SCRAPING OF MASTER CAST • Carving the depth of seal no.8 bur –2mm soft part—2 holes Centre—1 hole half depth • Roughing out & smoothing the seal cone shaped acrylic bur & medium grit sand paper disc www.indiandentalacademy.com
  • 30. TROUBLE SHOOTINGS • UNDEREXTENSION Reasons 1.Fovea palatini as a land mark 2.Without careful visualisation , palpation, marking of vibrating lines 3.Over trimming by laboratory technician www.indiandentalacademy.com
  • 31. TROUBLESHOOTINGS • UNDERPOSTDAMMING As a result of recording of tissues when the mouth was wide open during final impression Correction by scrapping—conventional By adding wax—fluid wax www.indiandentalacademy.com
  • 32. TROUBLESHOOTINGS • OVERPOSTDAMMING 1 Commonly due to over scraping of master cast 2 Tissue irritation 3 Corrected by selective reduction & polishing www.indiandentalacademy.com
  • 33. TROUBLESHOOTINGS • OVEREXTENSION Small ulcerations Corrected by marking the lesion with indelible pencil & transfer this marking on to the denture base and trim with bur and polished www.indiandentalacademy.com
  • 34. ADDING PPS TO AN EXISTING DENTURE • MOGHADAM & SCANDRETT suggest fluid wax technique www.indiandentalacademy.com
  • 35. THANK YOU www.indiandentalacademy.com

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