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Enamel
Enamel
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Izzati Yazid
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Cards (10)
Enamel
Lamellae
:
Thin leaf-like structures
in
enamel
that
extend
from
varying depths
from the
surface
of
enamel
towards
DEJ
Visible
in
ground sections
of
tooth
,
better
in
cross-section
Seen in carefully
demineralized
/
decalcified
sections of human enamel due to
higher organic content
Defects
formed during enamel development, filled with organic material
View source
Classification of enamel lamellae:
Type A
: Group of poorly calcified enamel rods
Type B
: Filled with odontogenic degenerated cells
Type C
: Cracks filled with organic matter
Develop in
lines of stress
where
calcification
may be
incomplete
, becoming a site of
weakness
in enamel for
bacterial entry
View source
Formation of enamel lamellae:
Develop
in
lines
of
stress
where
calcification
may be
incomplete
View source
Clinical significance of enamel lamellae:
Form a route for
bacterial entry
due to
weakness
in
enamel
View source
Differentiation between type C enamel lamellae and crack:
Use careful
demineralization
, crack
disappears
while lamella is
retained
due to
higher organic content
View source
Dentino-enamel junction
(
DEJ
):
Junction between
dentin
and
enamel
, established during formation of
dentin
and
enamel
Scalloped
appearance, revealed as a series of
ridges
under
scanning electron microscope
Ridging more pronounced in
coronal region
to prevent
shearing
of
enamel
during function
View source
Enamel spindle:
Spindle-shaped
structures seen in
enamel
at
DEJ
Formed by developing
odontoblast
processes extending into
ameloblasts
layer before enamel
formation
Demonstrated in
ground
sections, surrounded by
interrod
enamel
More spindles in
incisal
and
cuspal
regions, appear
dark
in
transmitted
light and
lighter
in
reflected
light
View source
Formation of enamel spindles:
Developing
odontoblast
processes extend into
ameloblasts
layer before
enamel
formation
View source
Gnarled
enamel:
Structure seen at
incisal
edge or
cusp
tips, formed by
intertwining
of enamel
rods
Arrangement withstands
masticatory
forces, formed due to
irregular
movement of
ameloblasts
during enamel
deposition
View source
Formation of gnarled enamel:
Irregular
movement of
ameloblasts
during
enamel deposition
due to
overcrowding
View source
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