Temporomandibular Joint (Tmj) Exposure; Double Tmj Exposure (Lateral, Pa Or Lateral-Pa); First Exposure - Jaw Closed - Planmeca ProMax X-ray User Manual

11 TEMPOROMANDIBULAR JOINT (TMJ) EXPOSURE

11.1 Double TMJ exposure (lateral, PA or lateral-PA)

Chin support
Adapter

11.1.1 First exposure - jaw closed

TEMPOROMANDIBULAR JOINT EXPOSURE VALUES (double TMJ lateral)
Child up to 6 years of age
Child 7-12 years of age
Adult female or small male
Adult male
Large adult male
User's Manual
NOTE
NOTE
NOTE
PATIENT
TEMPOROMANDIBULAR JOINT (TMJ) EXPOSURE
This procedure will produce open and closed views of the
left and right temporomandibular joints.
Before taking a true profile TMJ exposure determine the
angles at which the long axes of the condyles are from the
transcranial line. To do this take a submental vertex
exposure of the patient and measure the condyle angles.
Adjust the angle according to the instructions for 5.2
"Temporomandibular joint (TMJ) exposure programs" on
page 14).
In case you do not adjust the angle the exposure
program will use a default value of 17°.
Note that this is a double exposure and the C-arm will
travel through two exposure cycles.
Use the chin support for this exposure. Insert the chin
support into the adapter. Insert the adapter into the holes
in the patient support table.
Select the double TMJ exposure program you require,
refer to section 8.3 "Selecting temporomandibular joint
(TMJ) exposure program" on page 41.
Select the correct exposure parameters for the patient
being X-rayed according to the values in the following
table. Note that there are two sets of kV values: one set
for the closed jaw and a second set for the open jaw.
If the required diagnostic value can be reached
with lower mA values than the following table
indicates, you can use those lower values.
Always try to minimize the radiation dose to the
patient.
Increase the kV value in the enhanced resolution
mode by 2 kV and the mA value by 2 mA.
kV VALUE
Jaw closed Jaw open
62
64
66
68
70
ProMax X-ray unit with Dimax3 73
mA VALUE
60 5
62 6
64 7
66 8
68 9