Tag Archives: open mouth

TMJ Open Closed
4
Feb

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.

Cervical Odontoid AP Open Mouth
4
Feb

Overview

The open mouth odontoid radiograph images the odontoid process and lateral masses of C1 and C2. The patient opens the mouth and the beam is centered through the oral cavity. This view is essential for detecting odontoid fractures and atlantoaxial alignment.

Technique

Instruct the patient to open the mouth wide and align the lower edge of the upper incisors with the base of the skull. Center the detector to the open mouth and use appropriate exposure. Immobilize the head to reduce motion and ensure patient comfort.

Clinical Indications

Odontoid view is indicated for trauma with suspected C1 C2 injury and neck pain. It helps detect fractures of the dens and lateral mass displacement. CT is often used for detailed evaluation when radiographs are limited.

Image Assessment

Assess the odontoid process for cortical disruption and evaluate lateral mass symmetry. Look for atlantoaxial subluxation and prevertebral soft tissue swelling. Report findings and recommend CT for surgical planning when indicated.