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Patterns of tooth agenesis in Japanese subjects with bilateral agenesis of mandibular second premolars.
[oligodontia]
The
aim
of
this
study
was
to
explore
the
patterns
of
tooth
agenesis
in
Japanese
orthodontic
patients
with
bilateral
agenesis
of
mandibular
second
premolars
.
A
total
of
80
Japanese
orthodontic
patients
with
2
congenitally
missing
mandibular
second
premolars
were
selected
as
the
subjects
of
this
study
(
experimental
group
)
.
Another
80
individuals
without
bilateral
agenesis
of
mandibular
second
premolars
were
collected
for
comparison
(
control
group
)
.
The
2
groups
were
matched
with
regard
to
sex
.
Radiographs
,
dental
casts
and
records
of
medical
and
/
or
dental
treatment
were
used
to
identify
tooth
agenesis
.
The
Chi
-square
test
,
odds
ratio
,
and
test
for
equality
were
used
to
make
statistical
comparisons
.
The
prevalence
rates
of
other
types
of
tooth
agenesis
were
significantly
higher
in
the
experimental
group
than
in
the
control
group
.
The
occurrence
of
agenesis
of
maxillary
and
mandibular
lateral
incisors
and
third
molars
,
and
maxillary
second
premolars
was
also
significantly
higher
in
the
experimental
group
than
in
the
control
group
.
Significantly
increased
prevalence
rates
of
symmetrical
tooth
agenesis
,
with
third
molars
included
,
and
oligodontia
were
observed
in
the
experimental
group
.
Japanese
subjects
with
bilateral
agenesis
of
mandibular
second
premolars
are
at
significantly
high
risk
of
agenesis
of
other
types
of
permanent
teeth
,
symmetrical
tooth
agenesis
and
oligodontia
.
