Denar Mark II - Setting Articulator to Checkbite Records; Simulating Orbiting Condylar Paths

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To set the articulator to checkbite
records you will need the articulator to
which have been mounted both the
maxillary and mandibular casts. You will
also need right and left lateral checkbite
records and a protrusive record.
(Alternate techniques require fewer
checkbite records and use average
anatomical dimensions for those condy-
lar path dimensions not recorded and
measured.)
In this section we will first diagnose and
record the characteristics of the
patient’s orbiting paths of movement
from the two lateral checkbite records,
and then diagnose and record the incli-
nations of the protrusive condylar paths
with protrusive checkbite record.
SIMULATING THE ORBITING
CONDYLAR PATH
First remove the maxillary bow from the
articulator and confirm that both pro-
gressive side shift adjustments are set
to the 6˚ settings. The reason for this
setting was explained in the previous
section on the Immediate and
Progressive Side Shift Adjustments.
Next loosen the protrusive and immedi-
ate side shift adjustment lockscrews on
both sides of the articulator (a total of
four screws). Set the protrusive condylar
paths to 0˚ and move the medial fossa
walls medially to the limit of their range
of movement. Do not tighten the
lockscrews.
Seat the right lateral checkbite record
on the mandibular casts. Firmly seat the
maxillary cast in the checkbite record by
grasping the maxillary cast as illustrated
in fig. 60 or by applying pressure to the
top of the upper bow to immobilize the
maxillary cast (due to the fact that the
Mark II Articulator has the rotating
condylar paths built to average anatom-
ic dimensions, impingement of the rotat-
ing condyle against its rear and superior
fossa walls may sometimes prevent
complete seating of the maxillary cast in
the checkbite record). At this time the
left condyle is positioned inward, down-
ward, and forward from its centric relat-
ed position (fig. 61). Increase the inclina-
tion of the left protrusive condylar path
until the superior wall of the fossa con-
tacts the top of the condyle (fig. 62).
Secure the protrusive condylar path in
this position by tightening the
lockscrew.
Move the left medial fossa wall laterally
until it contacts the condylar element.
VII. SETTING THE ARTICULATOR
TO CHECKBITE RECORDS
fig. 60 fig. 61