Absence of Tomes process in first and final stage of enamel
deposition causes
Deposition of non-prismatic enamel. Hence the outermost and inner
most layer of enamel formed is highly mineralized.
Average width of cross striation in enamel rods
3 to 6 micrometers
short period deposition of incremental lines are commonly called as
cross striations
Long period records of incremental lines are commonly called as
Number of cross striation in an average human teeth
7 to 10 cross striations
Average distance between 2 cross striations is
4 micrometers
Average distance between 2 striae is
25 to 35 micrometers
In deciduous teeth enamel striae and perikymata can be best observed
cervical enamel
what is enamel cap
Along lateral surface, small elevations of 10 to 15 micrometers of
radius of enamel deposition over minute non-mineralizable deposits, often at
areas of late development in surface of enamel. These are electron
microscopical structures
What is enamel focal holes
Loss of enamel caps and underlying material by attrition or abrasion
leads to openings in enamel called as focal holes. These are electron
microscopical structures
What is enamel brouchs
large surface elevations like an enamel cap, 30 to 50 micrometers in
diameter, often with fine radiation groups of crystals – These are electron
microscopical structures.
The thickness of layer of the characteristic scalloping of DEJ is
25 to 100 micrometers
The DEJ is highly scalloped
Beneath the cusps and incisal edges. It is the area of concentration
of shear forces.
The DEJ is relatively smoother
in lateral surface of coronal enamel
What is the size of microscallops in DEJ
2 to 5 micrometers
average distance between two enamel tuft is about
100 micrometers
The protein content of enamel is highest along
enamel tufts
Structure of enamel best visualized in longitudinal section is
enamel spindles
Structure of enamel best visualized in transverse section is
enamel tufts and enamel lamellae
In which stage of amelogenesis does enamel knot formation occur
presecretory stage. Includes morphodifferentiation and
histodifferentiation stages


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