**3.3 Diagnosis**

Along with proper clinical examination, imaging of TMJ joint is also necessary. The most common methods are computed tomography (CT) and magnetic resonance imaging (MRI). Even though it has many advantages, it suffers certain drawbacks, being expensive, having necessity of advanced equipment, longer time needed to use it for TMJ images, its restricted use in patients with claustrophobia, pacemakers and metallic prosthesis.

Ultrasonography has been suggested as an alternative diagnostic method in the imaging of TMJ disorders, because it is less expensive.

High-resolution ultrasonography (HR-US) is the best way to investigate the TMJ conditions. The articular disk can be clearly seen during the mouth opening movement [13].
