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Taurodontism in Brazilian patients with tooth agenesis and first and second-degree relatives: a case-control study.
[oligodontia]
An
association
between
tooth
agenesis
and
taurodontism
has
been
suggested
.
To
verify
if
tooth
agenesis
and
taurodontism
are
associated
within
families
and
specific
patterns
of
tooth
agenesis
,
this
study
aims
to
compare
the
frequency
of
taurodontism
in
patients
with
nonsyndromic
familial
tooth
agenesis
,
their
first
and
second
-degree
relatives
with
complete
permanent
dentition
and
a
control
group
of
unrelated
healthy
individuals
with
complete
permanent
dentition
.
Panoramic
radiographs
of
patients
with
nonsyndromic
familial
tooth
agenesis
,
their
first
and
second
-degree
relatives
and
a
control
group
of
individuals
with
complete
permanent
dentition
were
examined
.
Taurodontism
was
assessed
on
permanent
mandibular
first
molars
.
The
difference
in
the
frequency
of
taurodontism
among
the
studied
groups
was
tested
with
Fisher
's
Exact
Test
.
Seventeen
families
with
nonsyndromic
familial
tooth
agenesis
were
studied
.
The
frequency
of
taurodontism
was
29
%
in
patients
with
tooth
agenesis
,
10
.
3
%
in
their
first
and
second
degree
relatives
,
and
6
.
6
%
in
the
control
group
.
A
significant
statistical
difference
among
the
studied
groups
was
observed
(
p
=
0
.
002
)
.
Taurodontism
was
proportionally
more
frequent
in
patients
with
a
higher
number
of
absent
teeth
.
It
was
mainly
observed
in
patients
from
families
in
which
the
proband
was
diagnosed
with
oligodontia
.
Taurodontism
is
more
frequent
in
nonsyndromic
familial
tooth
agenesis
.
Individuals
in
families
with
second
premolar
and
molar
oligodontia
are
more
likely
to
have
taurodontism
,
even
the
individuals
with
complete
dentition
.
This
association
could
define
a
subphenotype
for
future
genetic
studies
of
dental
development
.
Diseases
Validation
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"a control group of unrelated healthy individuals with complete permanent dentition"
symptom
oligodontia
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