16
To facilitate a clear understanding of the
relation of the orbiting condylar path to
occlusal anatomy study fig. 28.
Illustrated are the cuspal inclines of the
left bicuspids and molars which are
associated with the orbiting condylar
path. It is the distal aspects of the max-
illary lingual cusps’ buccal inclines
(shaded) which interrelate with the
mandibular buccal cusps’ lingual
inclines, mesial aspects. In your mind’s
eye it is helpful to dissect out these cus-
pal inclines (fig. 28A) and visualize what
influence a change in the character of
the orbiting path on the articulator
would have on these aspects of the
cusps. Three articulator controls estab-
lish the character of the orbiting path on
the articulator
__
the immediate side
shift adjustment and the inclination of
the medial and superior fossa walls. In-
creasing the immediate side shift adjust-
ment on the articulator increases the
clearance between these cuspal inclines
(fig. 28B). Increasing the progressive
side shift movement of the articulator
(increasing the inclination of the medial
fossa wall) flattens the cuspal inclines
mediolaterally (fig. 28C). A decrease of
the inclination of the superior fossa wall
flattens the cuspal inclines anterio-pos-
teriorly (fig. 28D).
fig. 28
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