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Distribution of permanent canine agenesis in Down syndrome: 15 cases from a Centre for Special Care Dentistry.
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The
purpose
of
this
study
was
to
investigate
the
distribution
of
permanent
canine
agenesis
in
subjects
with
Down
syndrome
(
DS
)
.
Subjects
with
canine
agenesis
were
determined
by
means
of
panoramic
radiographs
from
150
DS
subjects
attending
a
center
for
special
care
dentistry
.
Our
results
confirm
the
high
prevalence
of
agenetic
canines
in
DS
(
21
canines
,
14
%
)
.
We
found
specific
effects
on
the
distribution
both
of
phenotype
and
of
location
(
jaw
)
.
In
subjects
with
a
mild
expression
of
hypodontia
(
phenotype
nonoligodontia
)
agenetic
canines
primarily
occurred
in
the
mandibula
,
whereas
in
subjects
with
severe
hypodontia
(
phenotype
oligodontia
)
agenetic
canines
virtually
only
occurred
in
the
maxilla
.
In
both
phenotypes
cooccurrence
of
an
agenetic
lateral
incisor
with
an
agenetic
canine
was
observed
in
the
maxilla
.
It
was
striking
that
canine
agenesis
in
the
mandibula
did
not
cooccur
with
agenesis
of
other
teeth
.
These
results
can
be
important
for
treatment
planning
.
