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record bases & occlusal rims
record bases & occlusal rims
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5. hand out

  2. 2. Learning Objectives 1. Define a record base and list the materials used to make a record base. 2. Explain the technique of construction of autopolymerizing acrylic resin record base. 3. Define an occlusion rim and list the uses of occlusion rims. 4. Explain the technique of making occlusion rims.
  3. 3. Patient Visit #3 Visit 3 Clinical procedure Lab. procedure Jaw relations Face bow record Transferring Jaw Relations to the Articulator Anterior teeth Arrangement Horizontal relations Posterior teeth Arrangement Waxing & carving Teeth arrangement Vertical relations Orientation relations Teeth selection
  4. 4. Record base: an interim denture base used to support the record rim material for recording maxillomandibular records.  Also called denture base
  5. 5. Requirements of record bases:  1. It should be rigid,  2. Accurately adapted to the casts,  3. Fully cover the entire supporting tissues of the arches,  4. Esthetic and  5. Comfortable to the patient.
  6. 6. Materials used to make record bases: 1. Temporary record bases: They are discarded and replaced by denture base material, once their role in establishing jaw relation, teeth arrangement and try-in is complete.
  7. 7. Materials used to make record bases: 2. Permanent record bases: They are not discarded and become part of the actual base of the finished complete denture.
  8. 8. Materials used to make record bases: Types of temporary record bases:  Shellac base plate  Reinforced shellac base plate  Chemically cured acrylic resin  Visible Light Cured (VLC) acrylic resin
  9. 9. Materials used to make record bases: Types of permanent record bases:  Heat cured acrylic resin  Metal (Au, co-cr, Ti)
  10. 10. Technique of construction of autopolymerizing acrylic resin record base (sprinkle‐on technique)
  11. 11. Clinical Context of Lab Exercise  Record Bases are fabricated on the Master Casts following the 2nd Clinical Appointment (Final Impression Appointment) and  Are used during the 3rd and 4th clinical appointments for:  Maxillomandibular relation records  Arrangement of teeth for the wax trial denture
  12. 12. Materials
  13. 13. Block-out undercuts  Block-out under cuts with modelling wax.
  14. 14. So that the record base can easily be removed from the cast without damaging the master cast.
  15. 15.  Blocked out Master Casts coated with separating media.
  16. 16. Maxillary record base fabrication  Sprinkle-on Technique of resin addition
  17. 17. Build up labial flange by alternating polymer and monomer addition
  18. 18. Sprinkle on a thin consistent layer over the palate
  19. 19. Reinforce the ridge crest to prevent slumping
  20. 20. Keep the surface moist with monomer to prevent porosity
  21. 21. Manipulate the cast to prevent slumping Build up the flanges
  22. 22. Reinforce the lingual portion of the flange and ridge crest
  23. 23. Record Base Polymerization  Process acrylic resin in pressure pot  20 psi pressure  45 degrees C water  10 to 15 minutes  In absence of a pressure pot, place casts under an over-turned rubber mixing bowl
  24. 24. Record base removal Gently pry the record bases from the master cast  Soak the polymerized record base and casts in hot water to soften the block-out wax
  25. 25. Remove wax which may prevent seating of record base from tissue surface  Gently remove all block-out wax from master cast without damaging surface
  26. 26. Areas requiring modification on unfinished record bases Land Flash
  27. 27. Trim excess acrylic- flash
  28. 28. Completed Record Bases Checklist Palate should be consistent 2mm thick and well adapted to tissue surface Roughened ridge areas Thin areas labial to ridge  Retromolar pad area covered
  29. 29. Completed Record Bases Checklist No porosity or voids on tissue surface Flanges smooth and rounded Tissue surface well adapted
  30. 30. Completed Record Bases Checklist No excess flash (acrylic) on land area of master casts Flanges smooth and rounded
  31. 31. Record Bases & Occlusion Rims Maxillary Occlusion Rim Mandibular Occlusion Rim Occlusion rims
  32. 32. Occlusion Rim: Occluding surfaces fabricated on record bases for the purpose of making maxillomandibular relation records and arranging teeth.  also called record rim
  33. 33.  The record base and occlusion rims are necessary for:  (1) establishing facial contours,  (2) help in tooth selection,  (3) establishing and maintaining the vertical dimension of occlusion,  (4) making interocclusal records,
  34. 34.  (5) the arrangement of the denture teeth,  (6) a waxed-up mold for the external surface of the complete denture.
  36. 36. Anterior land area Midline Incisive papilla Guidelines drawn on the master casts
  37. 37. Mark the casts indicating midline, crest of the ridge, and the midpoint of the retromolar pad. These landmarks will be used to check teeth arrangement. maxilla mandible Incisive papilla midline Anterior land area Ridge crest Retromolar pad
  38. 38. Lines indicating the crest of the ridge Midpoint of retromolar pad Mark on land indicating the midpoint of the retromolar pad Land
  39. 39. Instruments and Materials a) Baseplate wax b) Wax knife & scale c) Occlusal plane former (hot plate) d) Master casts with denture bases
  40. 40. Dimensions of occlusion rims
  41. 41.  22 mm height from labial frenum,  12 mm height in the tuberosity from the record base  8-10 mm width posteriorly  6-8 mm width anteriorly Maxillary occlusion rim
  42. 42. Mandibular occlusion rim  18 mm height from labial frenum, mid- point or 2/3rds of retromolar pad posteriorly,  8-10 mm width posteriorly  6-8 mm width anteriorly
  43. 43. a) Place maxillary record base on the cast. b) Heat a sheet of baseplate wax in the bunsen burner until the wax is soft. c) Roll the wax into long tube. d) Starting at the tuberosity, press the roll of wax against the crest of the ridge. e) Seal the wax to the record base with a wax knife. Procedure
  44. 44. f) Heat the occlusal plane former in a flame and carefully form the occlusal aspect of the rim. g) Form the buccal and labial contours with the wax knife.
  45. 45. Use hot plate
  46. 46. Maxillary wax rim check list a) The occlusal portion of the rim should have the following thickness 1) Posterior region - 8- 10 mm 2) Anterior region - 6- 8 mm b) The plane of the rim should be parallel to the plane of occlusion AnteriorAnterior regionregion PosteriorPosterior regionregion
  47. 47. Maxillary Wax Rim Check List c) The labial and palatal surfaces must be smooth and free of voids d) The curvature of the anterior portion must simulate the curvature of the edentulous arch
  48. 48. The mandibular wax rim is fabricated in a similar manner. However, the rim should be centered over the crest of the ridge. Lingual contours must be concave and not impinge on the tongue space
  49. 49. Mandibular Occlusion Rim Adjustment  Centered over the ridge to maximize stability
  50. 50. Mandibular Occlusion Rim Adjustment  Posteriorly, the occlusion rim intersects 1/2 - 2/3 up the retromolar pad

Notas do Editor

  • Incisive papilla..
  • Mark middle of retromolar pad
    Central grooves .. Lower teeth on the line