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A STUDY ON THE CHANGES OF MR SIGNAL INTENSITY OF POSTERIOR ATTACHMENT OF THE TEMPOROMANDIBULAR JOINT

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Abstract

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#ÃÊ·Ï#
Magnetic resonance imaging has been used in the temporomandibular joint(TMJ)
primarily to define morphology and positional relationship of associating structures. This
report examines signal intensity characteristics of the posterior attachment as they
related to the severity of internal derangement.
Fifty six joints in 35 patients with a history of TMJ dysfunction were imaged with
MR using T1-weighted spin echo sequence. According to disk position,
ability to reduction, and the presence of osteoarthritis, the joints were categorized into
three groups. A group 1 was anterior disk displacement with reduction ; a group 2 was
anterior disk displacement without reduction ; a group 3 was anterior disk displacement
without reduction and condyle had osteoarthritic change. The control group was
determined by the clinical absence of any signs or symptoms of current or past TMJ
pain and dysfunction.
Calculated the relative value of MR signal intensity in posterior attachment and disk
to cerebral cortex of temporal lobe by means of computer program, we have compared
them with each groups. The result showed statistically little significant difference of
disk signal intensity among each groups. But, signal intensity from posterior attachment
in group 2 and 3 were significantly(p<0.05) decreased than control group. this might
reflect an fibrosis or hyalinization of posterior attachment, which was part of remodeling
process that occurs in disk displacement without reduction.
However, this study could not demonstrate histologic confirmation of the decreased
signal intensity in the posterior attachment. So, further investigation could be needed to
understand the association between them.

Å°¿öµå

MRI; signal intensity; posterior attachment;

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