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Dentinogenesis imperfecta type II: ultrastructure of teeth in sagittal sections.
[dentinogenesis imperfecta]
The
morphological
abnormalities
of
the
teeth
of
patients
affected
by
dentinogenesis
imperfecta
type
2
(
DI
-
II
)
may
underlie
the
difficulties
with
the
clinical
restoration
of
such
teeth
.
We
therefore
performed
a
scanning
electron
microscopy
(
SEM
)
study
of
four
permanent
first
mandibular
molars
of
four
DI
-
II
patients
with
periapical
pathosis
.
The
teeth
were
prepared
for
SEM
evaluation
by
standard
methods
.
In
the
crown
,
the
enamel
presented
a
highly
irregular
surface
with
a
number
of
cracks
and
crevices
.
In
some
places
,
only
granular
remains
of
the
enamel
were
found
,
while
in
other
parts
of
the
crown
,
the
enamel
was
absent
.
SEM
examination
revealed
the
structural
changes
responsible
for
the
lower
enamel
's
hardness
and
resistance
to
attrition
,
and
for
tooth
wear
,
while
the
structural
changes
in
the
dentin
may
explain
the
failure
of
some
adhesive
restorative
materials
.
This
SEM
study
thus
revealed
structural
defects
which
underlie
the
problems
of
attrition
and
restoration
loss
found
in
patients
with
this
genetic
dental
condition
.
