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Due to the proximity of the ear to the temporomandibular joint, TMJ pain can often be confused with ear pain. [23] The pain may be referred in around half of all patients and experienced as otalgia (earache). [50] Conversely, TMD is an important possible cause of secondary otalgia.
Temporomandibular joint pain is generally due to one of four reasons. Myofascial pain dysfunction syndrome, primarily involving the muscles of mastication. This is the most common cause. Internal derangements, an abnormal relationship of the disc to any of the other components of the joint. Disc displacement is an example of internal derangement.
Eagle syndrome (also termed stylohyoid syndrome, [1] styloid syndrome, [2] stylalgia, [3] styloid-stylohyoid syndrome, [2] or styloid–carotid artery syndrome) [4] is an uncommon condition commonly characterized but not limited to sudden, sharp nerve-like pain in the jaw bone and joint, back of the throat, and base of the tongue, triggered by swallowing, moving the jaw, or turning the neck. [1]
Prosthetic TMJ placement surgery is used as a last resort to manage severe pain and restricted function due to TMJ disorders. At the onset of symptoms, primary prevention such as a soft diet, cessation of gum chewing, physiotherapy and the use of non-steroidal anti-inflammatory drugs are put into place.
Hyperacusis is an increased sensitivity to sound and a low tolerance for environmental noise. Definitions of hyperacusis can vary significantly; it often revolves around damage to or dysfunction of the stapes bone, stapedius muscle or tensor tympani ().
In theory, the speed of sound is actually the speed of vibrations. Sound waves in solids are composed of compression waves (just as in gases and liquids) and a different type of sound wave called a shear wave, which occurs only in solids. Shear waves in solids usually travel at different speeds than compression waves, as exhibited in seismology.
More than 1.8 million people claim noisy neighbours have made their life a misery and they cannot enjoy their own homes. The impact of noise on health is potentially a significant problem across the UK given that more than 17.5 million Britons (38%) have been disturbed by the inhabitants of neighbouring properties in the last two years.
It has been suggested that the mechanism of Korotkoff sounds may not be a sound waves at all, but vibrations of the arterial walls that transmits into surrounding tissues, a bit like seismic waves. [ 4 ] [ 5 ] Others have hypothesized that the Korotkoff sounds are due to cavitation [ 6 ]
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