Week 11 : TMJ

RT 233

AP Axial TMJ 1. Supine or seated upright

2. Posterior teeth closed and in contact

3. For open mouth- wide as possible without chin jutted forward

4. OML perp to IR

5. CR 35 caudad, centered midway between TMJ’s.

6. Enters approx 3” above nasion

AP Axial TMJ Radiograph

1. No rotation

2. Minimal superimposition of petrosa on condyle in closed mouth

3. Condyle and TMJ below pars petrosa in open mouth

Axiolateral Oblique TMJ

1. Semiprone or seated

2. Center ½” anterior to EAM

3. Rest cheek on grid device

4. Rotate MSP approx 15 degrees toward IR

5. IPL perpendicular

6. CR 15 caudad exiting through TMJ closest to IR about 1 ½ “ superior to upside EAM

Axiolateral Oblique TMJ Radiograph

1. TMJ

2. Condyle lying in mandibular fossa in closed mouth

3. Condyle lying inferior to articular tubercle in open mouth

Axiolateral Oblique Open mouth

Axiolateral Oblique Open mouth

Temporomandibular fossa

condyle Coronoid

Axiolateral ObliqueClosed mouth

Axiolateral ObliqueClosed mouth

Temporomandibular fossa

coronoidcondyle

Axiolateral TMJ’s

• CR 25-30 degrees

• Enters ½” anterior and 2” superior to upside EAM

• IPL Perpendicular

• MSP parallel

Evaluation Criteria

• TMJ lying anterior to the EAM

• Condyle in fossa (closed mouth)

• Condyle inrerfior to articular tubercle (open mouthP

11

Axiolateral Closed Mouth

Axiolateral Open Mouth