Enamel-4

Questions	Answers
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	Striae
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 along	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