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Review
. 2018 Jul;91(3):280-287.
doi: 10.15386/cjmed-970. Epub 2018 Jul 31.

Imaging modalities for temporomandibular joint disorders: an update

Affiliations
Review

Imaging modalities for temporomandibular joint disorders: an update

Daniel Talmaceanu et al. Clujul Med. 2018 Jul.

Abstract

The diagnosis and management of temporomandibular disorders (TMD) require both clinical and imaging examinations of the temporomandibular joint (TMJ). A variety of modalities can be used to image the TMJ, including magnetic resonance imaging (MRI), computed tomography (CT), cone beam CT, ultrasonography, conventional radiography. The present review outlines the indications of the most frequently used imaging techniques in TMD diagnosis. Because of the anatomic complexity of the TMJ, imaging can be difficult. Choosing the proper imaging technique is essential. Conventional radiography, nowadays, is of limited interest. The use of flat plane films for TMJ pathology is not sufficient, because this joint requires three dimensional imaging views. Osseous changes are better visualized with CT and cone beam CT. Cone beam CT provides high-resolution multiplanar reconstruction of the TMJ, with a low radiation dose, without superimposition of the bony structures. MRI is a noninvasive technique, considered to be the gold standard in imaging the soft tissue components of the TMJ. MRI is used to evaluate the articular disc in terms of location and morphology. Moreover, the early signs of TMD and the presence of joint effusion can be determined. High-resolution ultrasonography is a noninvasive, dynamic, inexpensive imaging technique, which can be useful in diagnosing TMJ disc displacements. The diagnostic value of high-resolution ultrasonography is strictly dependent on the examiner's skills and on the equipment used.

Keywords: computed tomography; magnetic resonance imaging; temporomandibular disorders; temporomandibular joint; ultrasonography.

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Figures

Figure 1
Figure 1
Temporomandibular joint anatomy: GF - glenoid fossa; C - mandibular condyle; D - articular disc; RT - retrodiscal tissue; LPM - lateral pterygoid muscle.
Figure 2
Figure 2
Panoramic radiography: important asymmetry between right and left mandibular condyle.
Figure 3
Figure 3
Comparative TMJ views obtained with a panoramic equipment: mouth-closed (a), (d) and mouth-opened (b), (c).
Figure 4
Figure 4
Contact technique (Parma incidence) of imaging the TMJ: mouth-closed (a), mouth-opened (b).
Figure 5
Figure 5
CT scan of an intracapsular fracture of the right TMJ. Sagittal plane (a), coronal plane (b).
Figure 6
Figure 6
Cone beam CT of the right TMJ: flattening and erosions of the mandibular condyle. Sagittal plane (a), coronal plane (b).
Figure 7
Figure 7
Cone beam CT of TMJ: left condyle hyperplasia (arrow). Coronal plane (a), axial plane (b).
Figure 8
Figure 8
Sagittal, proton density, MRI of a normal TMJ: mouth-closed (a), mouth-opened (b). The disc (arrow) is in a correct position.
Figure 9
Figure 9
Sagittal, proton density, MRI of an anterior disc displacement with reduction: mouth-closed (a), mouth-opened (b). The displaced disc (arrow) returns to its normal position at maximal mouth opening.
Figure 10
Figure 10
Sagittal, T2 weighted, MRI of a TMJ effusion.
Figure 11
Figure 11
High-resolution US of an anterior disc displacement with reduction: mouth-closed (a), mouth-opened (b). The arrow shows the displaced disc.
Figure 12
Figure 12
High-resolution US of an anterior disc displacement without reduction: mouth-closed (a), mouth-opened (b). 1 - articular eminence; 2 – articular disc; 3 - mandibular condyle.

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