Complete Denture Dent 482.01 and

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Complete Denture Dent 482.01 and Powered By Docstoc
					The Facebow Transfer
 The ear pieces of the facebow are inserted in the
patient‟s ears bilaterally, the thumb screw is tightened
to lock it in place, and the patient holds the facebow in
the ears. The pointer is positioned so hat it points at
the ala of the nose ant the set screw tightened.
 With all adjustments made and all set screws tightened
to hold the parts of the facebow in place, the screw
fixing the facebow fork to the facebow can now be
loosened and the bite fork removed.
 The bite fork is removed from the facebow assembly.
Mount the Hanau mounting adaptor (marked with an H) on
the lower member of the articulator. Place the facebow
transfer into the mounting jig and tighten the set screw
to fix it in place.
 Make an „X‟ in the base of both casts
about ¼ inch deep, place a small bit of
Vaseline in this „X‟ and around the
border (about ¼ inch thick) then soak
the casts in water.
 Mount the maxillary cast to a mounting plate on the
upper member of the articulator. Put a little bit of
mounting plaster in the „X‟ of the cast and a little bit on
the mounting plate, then close the articulator.
Add more mounting plaster to give the mounting some
form. When the mounting plaster sets, the maxillary
baseplate can be removed from the bite fork and the
interocclusal record can be made in the mouth.
 Adjust the maxillary rim first by determining the
contours that support the labial and buccal face form.
Then determine then anterior height of the rim. This is
usually about 1-2 mm below the resting lip, but must be
confirmed by having the patient pronounce words that
have fricative sounds (Fifty –five, any words with f & v
sounds) .
  The maxillary rim is adjusted so that it is parallel to the
ala-tragus line and the inter-pupillary line and 1-2 mm
below the resting lip. A tongue blade running from the ala
of the nose to the tragus of the ear verifies that the Fox
occlusal plane analyzer is parallel to that line.
  Mark the vibrating line from hamular notch to hamular
notchn then cut this area out of the baseplate. This will
help improve the retention of the maxillary baseplate.
  To make sure the maxillary baseplate stays in place during
the interocclusal bite registration, sprinkle a small amount
of denture adhesive powder on the tissue side of the
denture.
  The mandibular rim is adjusted so that it fits intimately
against the maxillary rim at the proper vertical dimension.
This will provide a stable base for the interocclusal
relationship of the maxilla to the mandible to be recorded
accurately at centric relation.
  Measure the vertical dimension of occlusion (VDO) and
the vertical dimension at rest (VDR) and record these
measurements on a tongue blade. The difference between
the VDR and the VDO is known as „freeway space‟ and is
usually 2-4 mm.
 Next, adjust the mandibular wax rim so that it contacts
the maxillary rim when the patient closes together in
centric relation at the proper vertical dimension of
occlusion. Then, mark the midline of the ridge and adjust
the rim so that the width is equidistant buccolingually
from that line. Now, verify the VDO by having the
patient say sixty-six or other words containing “s” or “x”
sounds (sibilants). The rims should contact lightly only
when these sounds are made.
  A piece of dental floss is stretched from the middle of
the forehead, across the nose, and to the middle of the
chin to determine the midline of the denture teeth. A
piece of floss also is useful in determining the position of
the canine teeth by running it straight down from the
inside corner of the eye.
 The midline and cuspid line are clearly marked on the
maxillary rim.
  The mandibular rim is reduced so that there is adequate
space for a bite registration material (approximately 2
mm). Both rims then are scored with a sharp knife to
make „V‟-shaped cuts about 2 deep that cross in the
middle of the cast. This will ensure that the bite
registration will be stable in a lateral direction.
  This picture shows the interocclusal registration made
with Aluwax. It is best to use a rigid material such as
Aluwax or compound for the bite registration, as these
will not distort as a material such as polyether or
polyvinylsiloxane.
  The mandibular cast is affixed to the maxillary cast with
rigid braces. Plastic or metal are best but wood tongue
blade pieces can be used if they are kept dry (Wood will
swell if subjected to water and distort the mounting).
  Plaster is added to the mounting to fill in any voids and
trimmed with a sharp, stiff-bladed knife. A scalpel or
red-handled knife should not be used for this purpose as
they pose a safety risk to the student if the blade
breaks. As a final touch to give the mounting a
professional look, the plaster is smoothed with wet/dry
sandpaper.
  The final mounting looks very professional and can be
separated and remounted easily. Notice the square joints
between the mounting plaster and the cast.

				
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