TMJ: temporomandibular joints

What are the 2 (or 4) views for the TMJ projection?

1. ap axial-modified Towne’s view

   1. open & closed mouth

2. axiolateral view

   1. open & closed mouth

For all TMJ views

1. Collimation

2. LW/CW

3. Bucky/TT

4. SID

5. Shield?

6. Respiration

7. Cone down to what?

1. 8 ×10” or 10 × 12”

2. LW

3. bucky

4. 40”

5. yes

6. suspended respiration

7. TMJ’s (top to bottom, leave open rest of film)

For the AP Axial TMJ:

1. how is the patient positioned

2. what should be in contact with the upright bucky?

3. MSP is ____ to IR

4. OML is ____ to IR, (____ can also be used)

5. What is this view aka?

1. supine or seated upright

2. posterior skull

3. perpendicular

4. perpendicular, IOML

5. modified towne’s view

For the AP Axial TMJ:

1. where should the top of the IR border be placed at the level of?

2. CR is angled ____ caudal for OML

3. CR is angled ______ for IOML

4. CR is midway between ____, entering a point __” above the nasion

5. CR will pass through the ____ and exit the ___ _____

1. level of TEA

2. 30

3. 37

4. TMJ’s; 3”

5. TMJ’s; foramen magnum

What 2 exposures should be made for the AP axial TMJ

1. one with mouth closed

2. one with mouth open (if not contraindicated)

What anatomy is best shown for the AP Axial TMJ

mandibular condyles, condylar process not superimposed, ramus, temporomadibular articulation below pars petrosa

For the Axiolateral TMJs Schuller Method:

1. what is the patient position

2. MSP is ____ to IR

3. IPL is _____ to IR

4. IOML is ____ to transver axis

1. semi-prone with head in true lateral

2. parallel

3. perpendicular

What is the axiolateral TMJ view AKA

Schuller method

For the axiolateral TMJ view:

1. What is the CR angle

2. Where does the CR exit

3. Where does the CR enter

4. Center the IR to the level of TMJ, which is __” anterior and __” inferior to EAM

1. 25-30 degrees caudal

2. through TMJ closest to IR

3. 2” superior & 1/2” anterior to upside EAM

4. 1/2” anterior; 1” inferior to EAM

For the axiolateral TMJ, how is the patient positioned?

true lateral

How can you tell radiographically between an open mouth and closed mouth axiolateral TMJ view?

open mouth: mandibular condyle will be out of the mandibular fossa

closed mouth: mandibular condyle will be in the mandibular fossa

Where does the CR renter for the axiolateral TMJs

2” superior and 1/2” anterior to EAM on side up

What angle do we use for the axiolateral TMJs

25-30 degrees caudal