Planmeca Proline EC Panoramic User Manual page 29

Measure this distance
POSITIONING GUIDE FOR TEMPOROMANDIBULAR JOINT EXPOSURES
Distance from light beam to
User's manual
-04
mm
Focal trough light
auditory meatus
80 mm
85 mm
90 mm
95 mm
100 mm
105 mm
110 mm
-12
mm
Readjust patient position
TEMPOROMANDIBULAR JOINT EXPOSURE (P10)
Position the apices of the patient's upper central inci-
sors within the image layer (focal trough) of the unit.
To do this ask the patient to open their lips so that you
can see their teeth. Then press and hold either of the
focal trough positioning keys to move the patient posi-
tioning mechanism, and patient, backwards or for-
wards until the focal trough light, which indicates the
center of the focal trough, falls between the second
incisor and the canine. For an average patient posi-
tioning the teeth as described above will place the api-
ces of the upper central incisors within the focal
trough. The minus (-) key moves the patient forwards,
and the plus (+) key moves the patient backwards.
Note the number on the Focal trough positioning dis-
play.
Measure the distance from the focal trough light beam
to the center of the auditory meatus and then deter-
mine, from the table below, how much the patient must
be moved, backwards or forwards, to be correctly posi-
tioned for the temporomandibular joint exposure.
For example: If the number on the display was -04 and
the measured distance is 90 mm, you have to move
patient -8mm and the final position of the patient is
-12mm.
Adjustment to the position
of the patient
+8 mm
+4 mm
0 mm
-4 mm
-8 mm
-12 mm
-16 mm
Press either of the focal trough positioning keys to
readjust the position of the patient according to the
measurements given in the table.
Planmeca Proline EC Panoramic X-ray 25