-
wax rim purpose
- VDO
- occlusal plane
- lip & cheek contour
- orient incisal plane & midline
- ID position of max teeth
- facebow transfer medium
-
record base polymerization req
- pressure pot:
- 20 psi
- 110 F water
- 10-15 minutes
or overturn mixing bowl
-
record base materials
- tray resin: brittle but accurate
- light cure resin: brittle but accurate & expensive
- autopolymerizing acrylic resin: strong but less accurate
-
mandible cast landmarks
- midpoint of retromolar pad
- ridge crest lines
-
maxilla cast landmarks
- incisive papilla
- midline
- anterior land
-
record base requirements
- palate 1-2mm thick
- well adapted to tissue
- roughened ridge areas
- thin labial to ridge
- lingual reinforced but concave
- retromolar pad covered
- no porosity or voids on tissue surface
- flanges smooth and rounded
- no excess flash on land
- no rocking on cast & reasonably retentive
-
wax rims reqs
- thickness:
- 8mm molar
- 6mm premolar
- 3mm anterior
- plane parallel to occlusal plane
- laterally project anterior just beyond outer edge of land of cast
- lingual contours not impinge on tongue space
- labial and lingual surfaces smooth and no voids
- posterior should be tapered to avoid retromolar pad
- anterior curvature must simulate edentulous arch
-
3rd clinical appointment
- face bow
- VDO, VDR
- CR
- select teeth
-
ideal record base characteristics
- rigidity
- accuracy to master cast and patient
- smooth and rounded borders
- thickness resembles final dentures
-
facebow record
records orientation of maxilla to terminal hinge axis
provide same relative opening axis on the articulator as the maxilla to TMJ
-
posterior palatal seal on cast
- line 1mm anterior to posterior extension of denture
- 2nd line anterior in butterfly pattern
- do not extend to tuberosity or torus
- carve with discoid cleoid 1mm deep, feathered to hamular notch
-
wax rim try in
- mark midline
- make parallel to camper's plane & interpupillary line
- 1-2mm below lip line at rest
- measure incisal edge to incisive papilla distance
- notch
- bite fork w/aluwax
- 43mm above lateral incisor
-
VDR/VDO technique
- place pt upright
- mark tip of nose & chin on greatest height of curvature (unstrained)
- moisten lips, swallow, relax jaw
- mmm sounds, relax
- open wide relax
- record VDR
- VDO:
- moisten lips and relax
- closest speaking space: s sounds 60-70
- insert mandibular record and have patient close on back teeth
-
closest speaking space
- final test if vertical dimensions are correct
- s sounds 60-70
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