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The prevalence and distribution pattern of hypodontia among orthodontic patients in Southern Iran.
[]
To
evaluate
the
pattern
and
prevalence
of
hypodontia
and
its
association
with
different
malocclusions
among
orthodontic
patients
in
southern
Iran
.
In
this
study
,
a
total
of
494
records
of
orthodontic
patients
(
162
males
,
332
females
)
were
evaluated
.
To
investigate
percent
of
hypodontia
pertinent
information
of
patients
was
evaluated
.
Chi
-square
and
Fisher
's
exact
tests
were
used
for
statistical
analysis
.
The
prevalence
of
tooth
agenesis
was
7
.
66
%
.
Thirty
-
eight
patients
were
found
to
have
at
least
one
tooth
missing
.
Number
of
patients
having
hypodontia
was
the
most
in
class
III
patients
,
whereas
the
number
of
missing
teeth
was
more
in
class
II
sample
.
However
,
it
was
not
statistically
significant
(
P
=
0
.
569
)
.
Upper
lateral
incisor
(
27
.
95
%
)
,
lower
second
premolar
(
21
.
51
%
)
,
and
upper
first
premolar
(
12
.
9
%
)
were
respectively
the
most
frequently
absent
teeth
.
There
was
not
statistically
significant
difference
between
sexes
(
P
=
0
.
580
)
.
Hypodontia
observed
to
be
more
bilaterally
,
in
the
upper
arch
and
in
the
left
side
.
The
pattern
and
prevalence
of
hypodontia
is
different
among
races
and
ethnic
groups
.
In
our
study
population
,
hypodontia
was
found
to
be
7
.
66
%
.
Higher
prevalence
of
hypodontia
in
the
maxillary
arch
and
in
class
III
patients
may
be
considered
as
an
etiologic
factor
.
