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Prevalence of dental anomalies among 7- to 35-year-old people in Hamadan, Iran in 2012-2013 as observed using panoramic radiographs.
[dentin dysplasia]
This
study
was
performed
to
evaluate
the
prevalence
of
all
types
and
subtypes
of
dental
anomalies
among
7
-
to
35
-
year
-old
patients
by
using
panoramic
radiographs
.
This
cross-sectional
study
was
conducted
on
1649
people
in
Hamadan
City
,
in
2012
-
2013
.
The
prevalence
of
four
types
and
12
subtypes
of
dental
anomalies
was
evaluated
by
two
observers
separately
by
using
panoramic
radiography
.
Dental
anomalies
were
divided
into
four
types
:
(
a
)
shape
(
including
fusion
,
taurodontism
,
and
dens
invagination
)
;
(
b
)
number
(
including
hypodontia
,
oligodontia
,
and
hyperdontia
)
;
(
c
)
structure
(
including
amelogenesis
imperfecta
,
dentinogenesis
imperfecta
,
and
dentin
dysplasia
)
;
and
(
d
)
position
(
including
displacement
,
impaction
,
and
dilacerations
)
.
The
reliability
between
the
two
observers
was
79
.
56
%
according
to
the
Kappa
statistics
.
The
prevalence
of
dental
anomalies
diagnosed
by
panoramic
radiographs
was
29
%
.
Anomalies
of
position
and
number
were
the
most
common
types
of
abnormalities
,
and
anomalies
of
shape
and
structure
were
the
least
in
both
genders
.
Anomalies
of
impaction
(
44
.
76
%
)
,
dilacerations
(
21
.
11
%
)
,
hypodontia
(
15
.
88
%
)
,
taurodontism
(
9
.
29
%
)
,
and
hyperdontia
(
6
.
76
%
)
were
the
most
common
subtypes
of
dental
anomalies
.
The
anomalies
of
shape
and
number
were
more
common
in
the
age
groups
of
7
-
12
years
and
13
-
15
years
,
respectively
,
while
the
anomalies
of
structure
and
position
were
more
common
among
the
other
age
groups
.
Anomalies
of
tooth
position
were
the
most
common
type
of
dental
anomalies
,
and
structure
anomalies
were
the
least
in
this
Iranian
population
.
The
frequency
and
type
of
dental
anomalies
vary
within
and
between
populations
,
confirming
the
role
of
racial
factors
in
the
prevalence
of
dental
anomalies
.
Diseases
Validation
Diseases presenting
"hypodontia"
symptom
dentin dysplasia
dentinogenesis imperfecta
dystrophic epidermolysis bullosa
epidermolysis bullosa simplex
kabuki syndrome
oligodontia
This symptom has already been validated
