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

  1. 1. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com THE POSTERIOR PALATAL SEAL www.indiandentalacademy.com
  2. 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. 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. 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. 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. 6. ANATOMIC &PHYSIOLOGIC CONSIDERATIONS • POSTERIOR PALATAL SEAL AREA POST PALATAL SEAL PTERYGOMAXILLARY SEAL www.indiandentalacademy.com
  7. 7. • Hamular process It is located 2-4 mm postero medial to the distal limit of maxillary residual ridge www.indiandentalacademy.com
  8. 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. 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. 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. 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. 12. SOFT PALATE • M.M.HOUSE classification class1-- >5mm class2- 1-5mm class3- <1mm www.indiandentalacademy.com
  13. 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. 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. 15. SINGLE BEAD BUTTERFLY DOUBLE BEAD BUTTERFLY WITH www.indiandentalacademy.com POSTERIOR BEAD
  16. 16. PPS IN REF TO HOUSE CLASSIFICATION BUTTERFLY WITH HAMULAR NOTCH CUT WITH NO 9 BUR www.indiandentalacademy.com
  17. 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. 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. 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. 20. TECHNIQUES • CONVENTIONAL APPROACH • FLUID WAX TECHNIQUE • ARBITRARY SCRAPING OF MASTER CAST www.indiandentalacademy.com
  21. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 34. ADDING PPS TO AN EXISTING DENTURE • MOGHADAM & SCANDRETT suggest fluid wax technique www.indiandentalacademy.com
  35. 35. THANK YOU www.indiandentalacademy.com

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