We compared occlusal discomfort in patients with
temporomandibular disorders (TMD) between
myofascial pain (MFP) and disc displacement (DD)
using a database created from Sep, 2003 to Aug,
2005. We selected 71 patients with MFP and 170
patients with DD to construct a null model of
structural equation modeling (SEM) in which
anxiety influenced depressive mood, depressive
mood aggravated occlusal discomfort and sleep
complaints, and sleep complaints or an onset event
caused by another person aggravated occlusal
discomfort. We performed a simultaneous analysis
of patients with MFP and DD. The estimated
parameter of the path from depressive mood to
occlusal discomfort was significant for patients
with MFP, but not for patients with DD. The path
from an onset event caused by another person,
such as dental treatment to occlusal discomfort
was significant in patients with MFP and those
with DD. The Goodness of Fit Index (=0.909), The
Adjusted Goodness of Fit Index (=0.867), and The
Root Mean Square Error of Approximation (=0.039)
indicated good acceptability. These results
suggested that an increase in depressive mood
may aggravate occlusal discomfort in patients
with MFP, and an onset event caused by another
person, such as dental treatment, also may
aggravate occlusal discomfort in patients with
MFP and those with DD.
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