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TMJ Radiography

Different ways of imaging the TMJ

QuestionAnswer
What is TMJ bounded by laterally? Zygomatic arch
What is TMJ bounded by medially? Petrous ridge of temporal bone
What are the pathologic lesions associated with the TMJ disorders that are seen on the radiographs? - Fractures - Ankylosis - Athritic changes - Disc displacement - Fibrous adhesions - Benign & malignant tumors - Congenital absence of structures
What are the various positions the condyle can be imaged in? - Open - Closed - Rest
What are the different projections that can be used to view the TMJ - Panoramic projection - Transcranial TMJ projection - SMV (submental & basilar views) - Conventional tomography (before (CT) became popular) - CT & CBCT imaging - MRI (particularly for articular disc- soft tissue imaging) - Arthrography
What is the clinical indication of Transcranial TMJ projection? To examine: - articular eminence - superior plane of condyle - to evaluate condyle's mobility when pt's mouth is opened - to compare joint spaces on pt's right & left sides
How are pt's head & receptor positioned for Transcranial TMJ projection? - Pt's head: parallel to the receptor with the side to be imaged closest to the receptor - Receptor: supported by either pt's shoulder or positioning device in either Vertical or Horizontal position
The point of entry for the central ray of X-ray beam in Transcranial TMJ projection is: It is on opp. side of head from the condyle being radiographed, approx. 2.5" above & 0.5" in front of the External auditory meatus
At what angle is the X-ray beam directed in Transcranial TMJ projection? Directed @ vertical angulation of 20-25 degrees
SMV- Submental & Basilar views can be used to: - to view TMJ from axial plane - allows visualization of medial & lateral aspects of TMJ
Why can SMV projection be used as a scout film for tomograms of the TMJ? Because it relates the position of the long axis of the condyles with the pt’s midsagittal plane.
MRI is very effective means for: Viewing articular disc (soft tissues) of the TMJ
Structures that are radiolucent on CT scan or radiograph will appear: Opaque on MRI, indicating high soft tissue density or strong signal
What is the system of choice when imaging the disc & other soft tissues of the TMJ? MRI (Magnetic Resonance Imaging)
A means of radiographing the soft tissues associated with the TMJ with the use of an opaque contrast medium is: Arthrography
Created by: kp2850
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