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Impressions1

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  • 1. Complete Dentures Appointment 2 Final Impressions
  • 2. Introduction•Trays•Border molding•Making Impression•Post-Dam
  • 3. Baseplates Draw outline 2 mm short of periphery.Trim master cast Block out undercuts with wax or putty.
  • 4. Border of Mandibular Custom Tray
  • 5. Make wax spacers 2 mm cutback 1 thickness wax
  • 6. Making a Custom TrayRoll out tray Adapt tray material. material and form a handle.
  • 7. 2. Try tray on cast. 3.Observe 1.Trim off the trayexcess acrylic. handle.
  • 8. Finished Trays Finger RestsFinger rests are placed on traysfor severely atrophic mandibles.
  • 9. Finished Trays 6-7mm 11-12mm9-10mm
  • 10. Finished Mandibular Trays
  • 11. Triad TraysAdapt tray material to castsand trim any excess material.
  • 12. Triad Tray Finished
  • 13. Finished Tray Wax is left in place until border molding is completed.Tray is cut back Note the sizeto the 2mm wax and shape of spacer. the handles.
  • 14. Tray Extensions Before the final impressions are made ALWAYS check the trays for proper fit and extension.
  • 15. Fitting the tray
  • 16. Fitting the tray
  • 17. Fitting the tray
  • 18. Fitting the trayPoints to relieve in the mouth.
  • 19. Modeling Plastic •Gray or green •Water bath •128-135 F o •Ice
  • 20. Armamentarium
  • 21. Border MoldingMaking an impressionof the vestibule duringfunction. •Selective pressure
  • 22. Fitting the tray
  • 23. TemperAlways remember to temper the compound in a water bath before placing it in the mouth to avoid serious burns.
  • 24. Border Molding•Temper in waterbath 3-5 sec. thenplace in the mouthafter removal. •Trim
  • 25. Muscle Trimming
  • 26. stable. no tray displacement. no tissue impingement.
  • 27. Border mold the mandibular tray first.•Less chance of gagging patient.•Patient is more cooperative.•Familiarizes patient with procedure.•Allays apprehension.
  • 28. •Start by doing small areas.•Do the critical areas first. •Lingual Frenum • Labial Frenum • Buccal Frenum
  • 29. Functional Border Molding Sublingual Roll
  • 30. Border Molding Function Check
  • 31. Functional Border Molding Buccal Frenum
  • 32. Heat with alcohol torch.Temper, then muscle trim again.
  • 33. As you gain more skill andbecome more confident thentry the following technique.
  • 34. Start by border molding the labial and buccalflanges on the mandibular.
  • 35. Do one side of the lingual flange before moving to the other side.
  • 36. Move to the other sideand finish that side of the lingual flange.
  • 37. Finish the lingual frenum area ofthe mandibular denture by havingthe pt. thrust out his tongue.
  • 38. Heat with alcohol torchto soften selected areas and replace in mouth.
  • 39. Remove the wax spacerprior to making impression.
  • 40. Border Molding Maxillary Do Anterior First.
  • 41. Muscle Trim the maxillarycustom tray in the mouth. First do one side...
  • 42. ...then the other.
  • 43. Finish with the postpalatal seal.
  • 44. Border-Molded Maxillary Tray
  • 45. Properly Border-molded Maxillary Trays
  • 46. Polyether Technique Polyether impressionmaterial can also beused for border-molding the final tray.
  • 47. Polyether Technique •Advantages •Reduces overextension. •Quick •Disadvantages •Cost •Taste
  • 48. Polyether•It is critical that thetrays are madecorrectly. •2mm shy of fornix of vestibules. •2mm thick.
  • 49. PolyetherPaint on adhesive. Mix impression material.
  • 50. PolyetherA B A.Load tray with polyether impression material. B. Place tray in mouth. C. Borders of tray are C defined by impression.
  • 51. PolyetherFollow the same procedure for themaxillary impression. The mostobvious difference between the twotrays is that the maxillary bordermolding does not cover the tray.
  • 52. Polysulfide
  • 53. Impression Polysulfide •Remove Wax •Trim MP •Tray Adhesive
  • 54. Final Impression•Ready to make finalimpression. •Trays are retentive. •Borders are finished.
  • 55. Impression•Final impressions are:•Of uniform thickness.•(1mm)•Free of voids.•Contoured over ridge.
  • 56. Impression•Possess excellantsurface detail.•Not be too thick atthe borders (25mm)or overextended.
  • 57. Procedure After the border molding iscompleted the spacer wax isremoved and the tray ispainted with adhesive.
  • 58. Wax spacer is removed.
  • 59. Adhesive is painted on.
  • 60. ARMAMENTARIUM FOR FINAL IMPRESSION
  • 61. ProcedureThe patient isseated in theupright position. •Mouthwash •Reduce the saliva.
  • 62. ProcedureThe patient isasked to suckon a piece ofice to reducethe function ofthe palatineglands.
  • 63. Procedure Approximately 3-3.5 inches oflight body Permalastic is usedto make the impression.
  • 64. Procedure
  • 65. ProcedureLoading the impression tray.
  • 66. ProcedureFUNCTIONAL MOVEMENTS
  • 67. Mandibular Impression
  • 68. “Show-through” of border molding
  • 69. The filled tray.
  • 70. Muscle trim.
  • 71. ProcedureThe impression is heldin place for 6-8 minutes. •Tissue detail •Voids •Even thickness
  • 72. Hold tray in place.
  • 73. Other Types of Impressions Zinc Oxide-Eugenol Paste Final Impressions
  • 74. Polyvinylsiloxane Impression
  • 75. COMPLETED FINAL MANDIBULAR IMPRESSION HIGHLY DETAILED REPRODUCTION OF TISSUE SURFACE
  • 76. Land Area
  • 77. POST DAM
  • 78. Advantages•Aids In retention of theupper denture.•Helps control Gagging.•Compensates forprocessing shrinkage.
  • 79. Landmarks•Hamular Notch•Vibrating Line•Midpalatal Suture•Glandular Zone•Fovea Palatina
  • 80. Vibrating Line Imaginary line across theposterior part of the palate,marking the division betweenthe moveable and immovabletissues of the soft palate.
  • 81. Foveae Palatina Two small pits, one on eachside of the mid-line, near thejunction of the hard and softpalate.
  • 82. LandmarksFovea Hamular Notch
  • 83. Soft PalateHouse classified the soft palate according to how it drapes.
  • 84. House Classifications CLI CLII CLIII
  • 85. Soft Palate, Class I 5-10 mmVibrating line
  • 86. Soft Palate: Class II•Area for placement ofthe post-dam isreduced to 3-5mm.•Most common typefound in patients.
  • 87. Soft Palate: Class II Vibrating Line 3-5mm Class II
  • 88. Soft Palate: Class III •Represents the most limited area. •It usually ranges from 1-3 mm.
  • 89. Soft Palate: Class III•It is easiest to locate. •Care should be taken not to overextend the denture.
  • 90. Soft Palate: Class III Vibrating line1-3 mm Class III
  • 91. Vibrating LineLocated within these areasaccording to the type of softpalate. The area must bepalpated to determine howfar the line can be placed.
  • 92. Vibrating line Class IIIPlacement Zone CD Bead End of Denture
  • 93. Locating the Post-Dam •Dry the area with 4X4 gauze. •Palpate the tuberosity, midpalatal raphae, and hamular nitch.
  • 94. Procedure•Mark the hamularnotch with sterile inkstick.•Locate by having thepatient say ‘Ah’in short bursts.
  • 95. ProcedurePalpate and mark the area of the hamular notch.
  • 96. Post Dam
  • 97. Procedure
  • 98. Post-Dam
  • 99. ProcedureConnect to vibrating line.
  • 100. ProcedureReinsert Impression.
  • 101. Post-Dam
  • 102. Post-Dam
  • 103. Post-Dam
  • 104. Post-Dam
  • 105. Box and Pour•Rim, box, pour, separate,and trim the final cast.•You will need to retracethe marks on the cast sothat the post palatal sealis clearly marked.
  • 106. Box and PourBoxing wax should extend 10 mm above impression.
  • 107. Box and PourFinishing land area of maxillary master cast.
  • 108. Making a Baseplate Sprinkle Method •Work In sections •sift powder •wet with monomer
  • 109. Making a Baseplate Keep wet with monomer to avoid “sugar” look.
  • 110. Making a BaseplateFinger Adapted Dough Method Forming resin well in dough stage.
  • 111. Making a BaseplateFinger Adapted Dough Method Place dough over cast and adapt it well.
  • 112. Making a Baseplate Cure in warm pressure pot @ 20 psi/20 minutes.
  • 113. Making a BaseplateRemove from cast and trim off flash.
  • 114. Immediate Mandibular CDBoxed Impression and Final Cast