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Association between third molar agenesis patterns and agenesis of other teeth in a Japanese orthodontic population.
[oligodontia]
The
purpose
of
this
study
was
to
investigate
the
patterns
of
third
molar
agenesis
and
incidence
of
agenesis
of
other
permanent
teeth
in
a
Japanese
orthodontic
patient
group
.
A
total
of
417
Japanese
subjects
(
134
males
and
283
females
)
with
agenesis
of
one
or
more
third
molars
were
divided
into
four
groups
according
to
the
agenesis
pattern
,
and
874
other
Japanese
subjects
(
302
males
and
572
females
)
without
third
molar
agenesis
were
assigned
to
a
control
group
.
Panoramic
radiographs
and
medical
and
dental
records
were
used
to
examine
for
tooth
agenesis
.
The
Chi
-square
test
and
odds
ratio
were
used
to
make
statistical
comparisons
.
The
prevalence
of
third
molar
agenesis
worked
out
at
32
.
3
%
with
no
statistically
significant
gender
difference
.
A
high
prevalence
rate
of
agenesis
of
third
molars
,
unilateral
or
bilateral
,
could
be
considered
characteristic
of
the
Japanese
orthodontic
population
.
Significant
increases
in
occurrence
of
oligodontia
,
and
unilateral
or
bilateral
agenesis
of
other
teeth
,
including
maxillary
lateral
incisors
and
maxillary
and
mandibular
second
premolars
,
were
observed
in
all
or
almost
all
of
the
third
molar
agenesis
groups
,
compared
with
the
controls
.
A
significantly
increased
prevalence
rate
of
mandibular
lateral
incisor
agenesis
was
observed
in
almost
all
of
the
third
molar
agenesis
groups
.
The
Japanese
patients
with
third
molar
agenesis
had
a
significantly
increased
occurrence
of
oligodontia
,
and
unilateral
or
bilateral
agenesis
of
maxillary
and
mandibular
lateral
incisors
and
second
premolars
,
except
for
bilateral
agenesis
of
mandibular
lateral
incisors
.