Gamma CADIAX 4 A, Operating Instructions Manual

Page: 72 / 80

CADIAX compact
72
The movements of the right and left condyle recorded
during condylography are visualized in symmetric sub-
coordinate systems with identical axis definitions.
When recording movements on the patient, the distance
between left and right measurement electronics is natur-
ally greater than the distance between the right and left
condylar guidance elements in the articulator. It is for
this reason that recordings have to be recalculated to
the smaller distance before the software can calculate
articulator settings.
The zero points of right and left condyle used w hen re-
cording condylography.
The reference position set during recording represents the zero point of these sub-coordinate
systems. Ideally, the reference position is located on the hinge axis and remains fixed for the
duration of the recording. However, due to physiological reasons, most patients are unable to re-
turn to the precise starting position after a movement. In these cases it can happen that record-
ings do not start in the zero point, unless the reference position has been re-fixed before each
individual recording.
Besides viewing condylographic recordings in sagittal (X/Z) or transversal (X/Y) projection, the CADIAX
applications can also display additional coordinate systems for frontal projection (Y/Z):
The coordinate system w ith sagittal and transversal view . Extended coordinate system w ith sagittal, transversal, and
frontal view .
7.2 Exact and anatomic hinge axis
A CADIAX condylography recording can be carried out based on either the exact or the anatomic hinge
axis of the temporomandibular joint, depending on the used recording system. In both cases, the meas-
urement takes place in close proximity to the joint itself.
The exact hinge axis (also referred to as kinematic or individual hinge axis) is determined during the re-
cording on the patient. Here, the joint is fixated in retral position and the rotation center of stationary
open/close movements is observed. Subsequently, the measurement electronics are adjusted to that
position and the reference position is set. For recording on exact hinge axis without limitations, a
CADIAX 4 or CADIAX diagnostic device is required.
In contrast to the exact hinge axis, the anatomic hinge axis (also referred to as arbitrary hinge axis) is
not ascertained for each individual patient. Rather, its location is given through the empirically determ-
ined distance of 10 mm anterior to the ear canal. This position is indicated on the Reference AB face