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Bilateral hypodontia is more common than unilateral hypodontia in children with Down syndrome: a prospective population-based study.
[oligodontia]
In
individuals
with
simple
hypodontia
,
congenital
absence
of
teeth
commonly
affects
just
one
tooth
of
a
pair
,
not
both
.
However
,
patterns
of
hypodontia
have
not
been
fully
explored
in
children
with
Down
syndrome
(
DS
)
.
We
describe
the
frequency
and
left-
right
symmetry
of
hypodontia
in
the
permanent
dentition
of
8
-
to
9
-
year
-old
Norwegian
children
with
DS
.
T
his
population-based
cross-sectional
study
was
part
of
a
national
prospective
study
evaluating
upper
airway
function
,
hearing
,
dental
,
and
craniofacial
characteristics
in
a
cohort
of
children
with
DS
born
in
2002
.
The
cohort
consisted
of
29
children
with
DS
and
represented
57
per
cent
of
all
children
born
with
DS
in
Norway
in
2002
.
Hypodontia
was
assessed
using
panoramic
and
/
or
dental
radiographs
.
Data
were
collected
prospectively
at
TAKO-
Centre
,
National
Resource
Centre
for
Oral
Health
in
Rare
Medical
Conditions
,
Lovisenberg
Diakonale
Hospital
,
Oslo
,
Norway
.
Hypodontia
of
permanent
teeth
,
excluding
third
molars
,
was
found
in
61
.
5
per
cent
of
the
26
children
included
in
the
final
sample
.
Among
the
16
children
with
hypodontia
,
75
.
0
per
cent
were
missing
two
or
more
permanent
teeth
.
Two
children
(
7
.
7
per
cent
)
had
severe
hypodontia
(
oligodontia
)
.
The
teeth
most
often
missing
were
the
maxillary
lateral
incisors
,
followed
by
the
mandibular
second
premolars
and
maxillary
second
premolars
.
Most
(
68
.
9
per
cent
)
cases
of
hypodontia
occurred
bilaterally
.
The
majority
of
the
children
with
DS
were
missing
one
or
more
permanent
teeth
.
Unlike
in
the
general
population
,
bilateral
hypodontia
was
more
common
than
unilateral
hypodontia
in
this
sample
of
children
with
DS
.
Diseases
Validation
Diseases presenting
"followed by the mandibular second premolars and maxillary second premolars"
symptom
oligodontia
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