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Restricted mouth opening and trismus in oral oncology.
[oral submucous fibrosis]
Restricted
mouth
opening
(
RMO
)
and
trismus
are
terms
commonly
used
in
oral
oncology
in
instances
where
there
is
difficulty
in
mouth
opening
.
The
term
trismus
in
oral
oncology
is
mainly
used
to
indicate
the
radiation-induced
fibrosis
of
the
muscles
of
mastication
.
The
treatment
given
for
RMO
as
reported
in
the
literature
is
given
for
muscular
dysfunction
trismus
,
whereas
RMO
in
oral
oncology
can
occur
owing
to
various
reasons
other
than
muscular
dysfunction
.
RMO
occurs
in
various
conditions
of
the
oral
cavity
;
in
posterior
pharyngeal
infection
,
where
it
is
termed
reflectory
trismus
;
in
oral
submucous
fibrosis
;
in
oral
mucosal
disorders
;
in
the
use
of
certain
drugs
;
and
in
minor
dental
procedures
of
the
posterior
oral
cavity
.
The
usage
of
the
term
trismus
in
all
RMO
cases
would
complicate
the
treatment
;
thus
,
the
word
should
not
be
used
in
all
RMO
cases
.
