Sonography is the evaluation of any sounds coming from the jaw joints to help in the diagnosis of TMD.
It can evaluate the absence of sounds, clicks and crepitus (the scraping of bone on bone). It evaluates the frequency of the sound, the position of the sound in the open/close cycle of the jaw and the amplitude of the sound.
It can help the dentist identify a problem with the soft tissues inside the jaw joints.
These are all important in the diagnosis of TMD to effectively apply the correct treament option for you. It can also provide the information needed to make a prognosis for your condition.