Impressions1

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Impressions1

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

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