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RECORD BASES AND
OCCLUSION RIMS
Learning Objectives
1. Define a record base and list the
materials used to make a record base.
2. Explain the technique of...
Jaw Relations/
maxillomandibular relationship
Patient Visit #1
Visit 1
Clinical
procedure
Lab.
procedure
Taking
case history
Selecting
the stock tray
Preliminary
Cast P...
Patient Visit #2
Visit 2
Clinical
procedure
Lab.
procedure
Evaluation of custom
impression trays
Border molding
Beading & ...
Patient Visit #3
Visit 3
Clinical
procedure
Lab.
procedure
Jaw relations Face bow record
Transferring Jaw
Relations to the...
 Third Clinical Appointment
Transfer our patient’s . . .
 Third Clinical Appointment
Transfer our patient’s . . .
. . .maxillary and mandibular relationship. . .
 Third Clinical Appointment
. . . to our articulator
Maxillomandibular relation records
Facebow
Record base: an interim
denture base used to support
the record rim material for
recording maxillomandibular
records.
 A...
Requirements of record bases:
 1. It should be rigid,
 2. Accurately adapted to the
casts,
 3. Fully cover the entire
s...
Materials used to make record
bases:
1. Temporary record bases: They
are discarded and replaced by
denture base material, ...
Materials used to make record
bases:
2. Permanent record bases: They
are not discarded and become
part of the actual base ...
Materials used to make record
bases:
Types of temporary record bases:
 Shellac base plate
 Reinforced shellac base plate...
Materials used to make record
bases:
Types of permanent record bases:
 Heat cured acrylic resin
 Metal (Au, co-cr, Ti)
Shellac record base
Reinforced shellac record base
Chemically-cured record base
Visible Light Cured acrylic resin
record base
Heat cured record base
Metallic record base
Technique of construction of
autopolymerizing acrylic resin
record base
(sprinkle‐on technique)
Clinical Context of Lab Exercise
 Record Bases are fabricated on the
Master Casts following the 2nd
Clinical
Appointment ...
Occlusion rims
Materials
Block-out undercuts
Block-out undercuts
 Block-out under cuts with
modelling wax.
So that the record base can easily
be removed from the cast without
damaging the master cast.
Separating media
 Sodium alginate +
calcium sulfate =
insoluble calcium
alginate
 Blocked out Master Casts
coated with separating media.
Maxillary record base fabrication
 Sprinkle-on Technique of
resin addition
Build up labial flange by alternating
polymer and monomer addition
Sprinkle on a thin consistent
layer over the palate
Reinforce the ridge crest to
prevent slumping
Keep the surface moist with monomer to
prevent porosity
Manipulate the cast to prevent slumping
Build up the flanges
Reinforce the lingual portion of
the flange and ridge crest
Record Base Polymerization
 Process acrylic resin in pressure pot
 20 psi pressure
 45 degrees C water
 10 to 15 minut...
Pressure pot
Rubber bowl
Record base removal
Gently pry the record bases from the
master cast
 Soak the polymerized record
base and casts in hot ...
Remove wax which may prevent seating of record base from
tissue surface
 Gently remove all block-out wax
from master cas...
Areas requiring
modification on
unfinished record
bases
Land
Flash
Trim excess acrylic- flash
Completed Record Bases Checklist
Palate should be consistent 2mm thick and well adapted to
tissue surface
Roughened ridg...
Completed Record Bases Checklist
No porosity or voids on tissue surface
Flanges smooth and rounded
Tissue surface well ...
Completed Record Bases Checklist
No excess flash (acrylic) on land area of master casts
Flanges smooth and rounded
Record Bases & Occlusion Rims
Maxillary Occlusion Rim
Mandibular Occlusion Rim
Occlusion rims
Occlusion Rim: Occluding
surfaces fabricated on record bases
for the purpose of making
maxillomandibular relation records...
Occlusion rims
 The record base and occlusion rims
are necessary for:
 (1) establishing facial contours,
 (2) help in tooth selection,...
 (5) the arrangement of the
denture teeth,
 (6) a waxed-up mold for the
external surface of the complete
denture.
MATERIALS USED FOR MAKING
OCCLUSION RIMS
1. Base plate wax
Anterior
land area
Midline
Incisive
papilla
Guidelines drawn on the master
casts
Mark the casts indicating midline, crest of the
ridge, and the midpoint of the retromolar pad.
These landmarks will be use...
Lines indicating
the crest of the
ridge
Midpoint of
retromolar pad
Mark on land
indicating the
midpoint of the
retromolar ...
6060
Instruments and Materials
a) Baseplate wax
b) Wax knife & scale
c) Occlusal plane former (hot
plate)
d) Master casts with ...
Dimensions of occlusion rims
 22 mm height from labial frenum,
 12 mm height in the tuberosity from the
record base
 8-10 mm width posteriorly
 6-8...
Mandibular occlusion rim
 18 mm height from labial frenum, mid-
point or 2/3rds of retromolar pad
posteriorly,
 8-10 mm ...
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...
f) Heat the occlusal plane
former in a flame and
carefully form the occlusal
aspect of the rim.
g) Form the buccal and
lab...
Use hot plate
Maxillary wax rim check list
a) The occlusal portion of
the rim should have
the following thickness
1) Posterior region - ...
Maxillary Wax Rim Check List
c) The labial and
palatal surfaces
must be smooth
and free of voids
d) The curvature of
the a...
The mandibular wax
rim is fabricated in a
similar manner.
However, the rim
should be centered
over the crest of the
ridge....
Mandibular Occlusion Rim
Adjustment
 Centered
over the
ridge to
maximize
stability
Mandibular Occlusion Rim
Adjustment
 Posteriorly, the
occlusion rim
intersects 1/2 -
2/3 up the
retromolar pad
‫أسئلة‬ ‫أي‬
record bases & occlusal rims
record bases & occlusal rims
record bases & occlusal rims
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record bases & occlusal rims

intro to dentures, shammasm, removable prosthodontics

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record bases & occlusal rims

  1. 1. RECORD BASES AND OCCLUSION RIMS
  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. Jaw Relations/ maxillomandibular relationship
  4. 4. Patient Visit #1 Visit 1 Clinical procedure Lab. procedure Taking case history Selecting the stock tray Preliminary Cast Pouring Preliminary Casts Preliminary impression Wax Spacer Custom Trays
  5. 5. Patient Visit #2 Visit 2 Clinical procedure Lab. procedure Evaluation of custom impression trays Border molding Beading & Boxing & Pouring the casts Master casts Final impression Record Bases Occlusal Rims
  6. 6. 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
  7. 7.  Third Clinical Appointment Transfer our patient’s . . .
  8. 8.  Third Clinical Appointment Transfer our patient’s . . . . . .maxillary and mandibular relationship. . .
  9. 9.  Third Clinical Appointment . . . to our articulator Maxillomandibular relation records
  10. 10. Facebow
  11. 11. Record base: an interim denture base used to support the record rim material for recording maxillomandibular records.  Also called denture base
  12. 12. 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.
  13. 13. 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.
  14. 14. 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.
  15. 15. 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
  16. 16. Materials used to make record bases: Types of permanent record bases:  Heat cured acrylic resin  Metal (Au, co-cr, Ti)
  17. 17. Shellac record base Reinforced shellac record base
  18. 18. Chemically-cured record base
  19. 19. Visible Light Cured acrylic resin record base
  20. 20. Heat cured record base
  21. 21. Metallic record base
  22. 22. Technique of construction of autopolymerizing acrylic resin record base (sprinkle‐on technique)
  23. 23. 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
  24. 24. Occlusion rims
  25. 25. Materials
  26. 26. Block-out undercuts
  27. 27. Block-out undercuts  Block-out under cuts with modelling wax.
  28. 28. So that the record base can easily be removed from the cast without damaging the master cast.
  29. 29. Separating media  Sodium alginate + calcium sulfate = insoluble calcium alginate
  30. 30.  Blocked out Master Casts coated with separating media.
  31. 31. Maxillary record base fabrication  Sprinkle-on Technique of resin addition
  32. 32. Build up labial flange by alternating polymer and monomer addition
  33. 33. Sprinkle on a thin consistent layer over the palate
  34. 34. Reinforce the ridge crest to prevent slumping
  35. 35. Keep the surface moist with monomer to prevent porosity
  36. 36. Manipulate the cast to prevent slumping Build up the flanges
  37. 37. Reinforce the lingual portion of the flange and ridge crest
  38. 38. 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
  39. 39. Pressure pot
  40. 40. Rubber bowl
  41. 41. 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
  42. 42. Remove wax which may prevent seating of record base from tissue surface  Gently remove all block-out wax from master cast without damaging surface
  43. 43. Areas requiring modification on unfinished record bases Land Flash
  44. 44. Trim excess acrylic- flash
  45. 45. 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
  46. 46. Completed Record Bases Checklist No porosity or voids on tissue surface Flanges smooth and rounded Tissue surface well adapted
  47. 47. Completed Record Bases Checklist No excess flash (acrylic) on land area of master casts Flanges smooth and rounded
  48. 48. Record Bases & Occlusion Rims Maxillary Occlusion Rim Mandibular Occlusion Rim Occlusion rims
  49. 49. Occlusion Rim: Occluding surfaces fabricated on record bases for the purpose of making maxillomandibular relation records and arranging teeth.  also called record rim
  50. 50. Occlusion rims
  51. 51.  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,
  52. 52.  (5) the arrangement of the denture teeth,  (6) a waxed-up mold for the external surface of the complete denture.
  53. 53. MATERIALS USED FOR MAKING OCCLUSION RIMS 1. Base plate wax
  54. 54. Anterior land area Midline Incisive papilla Guidelines drawn on the master casts
  55. 55. 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
  56. 56. Lines indicating the crest of the ridge Midpoint of retromolar pad Mark on land indicating the midpoint of the retromolar pad Land
  57. 57. 6060
  58. 58. Instruments and Materials a) Baseplate wax b) Wax knife & scale c) Occlusal plane former (hot plate) d) Master casts with denture bases
  59. 59. Dimensions of occlusion rims
  60. 60.  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
  61. 61. 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
  62. 62. 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
  63. 63. 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.
  64. 64. Use hot plate
  65. 65. 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
  66. 66. 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
  67. 67. 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
  68. 68. Mandibular Occlusion Rim Adjustment  Centered over the ridge to maximize stability
  69. 69. Mandibular Occlusion Rim Adjustment  Posteriorly, the occlusion rim intersects 1/2 - 2/3 up the retromolar pad
  70. 70. ‫أسئلة‬ ‫أي‬

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