Mark II Instruction Manual - Whip Mix

Clamp
fig. 42 fig. 43
At this point you will be ready to attach
the facebow side arms. Note that they
are marked right and left and refer to the
patient’s right and left. Make sure that
the scales on the posterior reference
slides are adjusted to their zero positions.
A. Facebow Application
Remove the nylon earpieces on both
the posterior reference slides and begin
the attaching of the side arms (fig.
43). First you will need to locate the
right side arm on the crossbar so that
the lockscrew on the crossbar clamp
faces upward and the posterior reference
pin at the end of the posterior
reference slide lightly touches the
posterior reference point. Secure the
side arm clamp to the anterior crossbar.
Then attach the left side arm
similarly.
B. Earbow Application
Make sure the nylon earpieces are on
both posterior reference slides. Position
the right arm on the crossbar so
that the lockscrew on the crossbar
clamp faces upward and the nylon
earpiece fits snugly in the external
auditory meatus. Secure the side
arm clamp tightly and attach the left
side arm similarly.
At this point the facebow/earbow records
the relationship of the maxillary
dental structure to the posterior reference
points. The only thing remaining to
be done is to relate the maxillary dental
structures to the anterior reference
point.
Insert the reference rod into its clamp
bringing it up from underneath the
clamp, with the step in the rod facing
toward the patient’s right (fig. 44). Hold
the reference plane locator between the
thumb and index finger of your left hand
so that you can read the instructions
on the back. The semilunar notch on
the locator’s inferior surface should be
placed over the bridge of the nose. Note
the small hole in the center of the locator.
Turn the locator down flat so that the
instruction side faces downward and
index the hole on the locator over the
small dowel-like projection on the upper
extremity of the reference rod. Position
your eye approximately six inches
in front of the locator. By line of sight
adjust the locator by inclining it anterioposteriorly
and medio-laterally until a
projection of its broad surfaces pass
through both posterior reference points
as indicated by the posterior reference
slides (fig. 45). At this time the anterior
reference point marked on the patient’s
face may be above or below the reference
plane locator.
Adjust the height of the reference rod so
that a projection of the locator’s broad
surfaces passes through the anterior
reference point as well as the posterior
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