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Dentinogenesis imperfecta - hardness and Young's modulus of teeth.
[dentinogenesis imperfecta]
Dentinogenesis
imperfecta
type
II
(
DI
-
II
)
is
the
most
common
dental
genetic
disease
with
reported
incidence
1
in
8000
.
Elasticity
and
hardness
of
the
enamel
of
teeth
are
important
values
which
are
connected
with
their
resistance
to
attrition
.
It
is
hypothesized
that
values
of
physical
properties
for
healthy
teeth
and
teeth
with
DI
-
II
are
different
.
The
aim
of
the
study
was
to
investigate
some
physical
properties
of
teeth
extracted
from
patients
with
DI
-
II
in
comparison
with
normal
teeth
.
The
material
of
the
study
was
six
teeth
:
three
lower
molars
,
with
clinical
signs
of
DI
-
II
,
which
were
extracted
due
to
complications
of
pulp
inflammation
and
three
other
lower
molars
which
were
extracted
for
orthodontic
reasons
-
well
formed
,
without
any
signs
of
pathology
.
The
surfaces
of
DI
-
II
and
normal
teeth
were
tested
on
the
CSM
Instruments
Scratch
Tester
machine
(
producer
CSEM
Switzerland
)
by
Oliver
and
Pharr
method
.
The
indenter
used
was
Vicker
's
VG-
73
diamond
indenter
.
Additionally
,
the
Scanning
Electron
Microscopy
(
SEM
)
analysis
of
the
surface
of
the
teeth
with
DI
-
II
was
made
.
Vickers
hardness
of
the
teeth
with
dental
pathology
(
DI
-
II
)
was
seven
times
smaller
,
and
Young
's
modulus
six
times
smaller
than
those
of
healthy
teeth
.
The
parameters
of
hardness
and
elasticity
of
enamel
of
teeth
with
clinical
diagnosis
of
DI
-
II
were
very
much
smaller
than
in
normal
teeth
and
because
of
that
can
be
responsible
for
attrition
.
Diseases
Validation
Diseases presenting
"three other lower molars which were extracted for orthodontic reasons"
symptom
dentinogenesis imperfecta
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