Editing Temporomandibular joint dysfunction (section)

====Joint noises====
Noises from the TMJs are a symptom of dysfunction of these joints. The sounds commonly produced by TMD are usually described as a "click" or a "pop" when a single sound is heard and as "crepitation" or "crepitus" when there are multiple, grating, rough sounds. Most joint sounds are due to internal derangement of the joint, which is instability or abnormal position of the articular disc.<ref name="Odell 2010">{{cite book|veditors=Odell EW|title=Clinical problem solving in dentistry|url=https://archive.org/details/clinicalproblems00odel|url-access=limited|year=2010|publisher=Churchill Livingstone |location=Edinburgh|isbn=9780443067846|pages=[https://archive.org/details/clinicalproblems00odel/page/n47 37]–41|edition=3rd}}</ref> Clicking often accompanies either jaw opening or closing, and usually occurs towards the end of the movement. The noise indicates that the articular disc has suddenly moved to and from a temporarily displaced position (disk displacement with reduction) to allow completion of a phase of movement of the mandible.<ref name="Scully 2008" /><ref name="Glick 2003" /> If the disc displaces and does not reduce (move back into position) this may be associated with locking. Clicking alone is not diagnostic of TMD since it is present in high proportion of the general population, mostly in people who have no pain.<ref name="Scully 2008" /> Crepitus often indicates arthritic changes in the joint, and may occur at any time during mandibular movement, especially lateral movements.<ref name="Scully 2008" /> Perforation of the disc may also cause crepitus.<ref name="Kerawala 2010" /> Due to the proximity of the TMJ to the [[external auditory meatus|ear canal]], joint noises are perceived to be much louder to the individual than to others. Often people with TMD are surprised that what sounds to them like very loud noises cannot be heard at all by others next to them. However, it is occasionally possible for loud joint noises to be easily heard by others in some cases and this can be a source of embarrassment e.g. when eating in company.