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Temporomandibular joint disorders Introduction |
Temporomandibular
joint disorders (TMJD) refer to any
pain in the jaw or face that occurs
in or around the temporomandibular
joint (TMJ). This
condition can include pain
from the muscles of mastication
(medial and lateral pterygoids,
masseter, and temporalis), the
overlying fascia, or any combination
of the joint, muscles, and fascia. The main classifications of
Temporomandibular joint disorders
include:
-
internal joint
derangement (dislocation)
-
myofascial pain
syndrome
-
agenesis (no bone)
-
hyper
and hypo-plasia of the condyle
-
fusion of the joint or ankylosis
-
and arthritis.
For the purpose of
this article discussion will be
focused on internal joint
derangement (dislocation), myofascial pain syndrome, and
arthritis of the temporomandibular
joint.
Internal joint
derangement is the dislocation
of the articular disk (cartilage) in
between the bones. It is displaced anteriorly and then pops back in
during the opening-closing cycle of
the mouth. It can also remain
anterior and not pop back into
place, which results in a decreased
range of motion for the
temporomandibular joint. Internal joint derangement affects
about 1/3 of the population at some
point in time. It affects men and
women equally.
Myofascial
pain syndrome is the most
common disorder of the
temporomandibular joint. It is
the result of bruxism, or grinding
and clinching the jaw, usually at
night. It affects women more than
men. Occurrence peaks in the 20's
then again during perimenopause.
Arthritis
is another disorder of the temporomandibular joint. Several different
variations of arthritis
can occur and include; infectious,
degenerative, and rheumatoid. Degenerative, or osteoarthritis, of
the temporomandibular joint occurs
primarily in
individuals over the age of 50. The temporomandibular joint will be affected in over 50% of
patients with rheumatoid arthritis,
though it is usually one of the
last joints to be significantly affected. [1]
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Temporomandibular joint
disorders Symptoms
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The most
common symptoms of Temporomandibular
joint disorders are a popping
or clicking when opening and closing
the mouth, and radiating pain. Each of the
different classifications can
present similarly or differently,
and symptoms are dependant upon the individual. Persons with
myofascial pain
syndrome will often complain of
soreness, headache, and decreased
ability to open the mouth. All
three classifications can result in
localized swelling around the joint
and supporting structures. [2]
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Temporomandibular joint
disorders Statistics |
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Learn More About
Temporomandibular joint disorders |
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