Overview
TMJ open and closed mouth radiographs evaluate condylar translation and joint space changes. Paired views demonstrate dynamic motion and detect dislocation or degenerative change. Proper positioning ensures reproducible comparison between states.
Technique
Obtain closed mouth and open mouth projections with the detector centered to the TMJ and the patient in a true lateral or modified Towne position. Use appropriate exposure and instruct the patient on mouth opening degree. Immobilize the head to reduce motion.
Clinical Indications
TMJ open closed views are indicated for pain dysfunction and suspected dislocation. They help assess condylar translation and joint space narrowing. MRI is preferred for soft tissue and disc evaluation when indicated.
Image Assessment
Compare condylar position between open and closed views and assess for translation limitation. Evaluate joint space asymmetry and osseous degenerative changes. Report findings relevant to dental or surgical management.