Histology Of Enamel

Front 1

Maximum thickness of enamel

Back 1

2 to 2.5mm

Front 2

Enamel's permeability

Back 2

Semi-permeable

Front 3

Chemical Property of enamel

Back 3

96% Inorganic

4% Organic

Front 4

Inorganic material of enamel

Back 4

Hydroxyapatite

Front 5

Organic proteins of enamel

Back 5

Amelogenins and Non-amelogenin

Front 6

What are the non-amelogenin

Back 6

1.enamelin

2.ameloblastin

3.tuftelin

Front 7

Enamel Rod Longitudinal section

Back 7

Cylindrical

Front 8

Enamel Rod Direction Deciduous

Back 8

cervical-horizontal direction

Front 9

Enamel Rod Direction Permanent

Back 9

Cervical-Apical Direction

Front 10

envelopes each enamel rod

Back 10

Rod Sheath

Front 11

separates rods from each other

Back 11

Interrod Substance

Front 12

twisted enamel rods under cusp tip or incisal edge (gives maximum strength)

Back 12

Gnarled Enamel

Front 13

incremental lines that are oriented perpendicular to the length of an enamel rod

Back 13

Cross Striations

Front 14

optical phenomenon due to change in the direction of rods

Back 14

Hunter-Schreger Bands

Front 15

alternating dark and light strips of varying widths

Back 15

Hunter-Schreger Bands

Front 16

seen most clearly in longitudinal ground section viewed by reflected light.

Back 16

Hunter-Schreger Bands

Front 17

found in the inner two thirds of enamel

Back 17

Hunter-Schreger Bands

Front 18

• brownish bands

• reflect appositional or incremental growth of the enamel layer

Back 18

Incremental Lines of Retzius

Front 19

external manifestation of Lines of Retzius

Back 19

Perikymata

Front 20

series of lines which extends from DEJ towards tooth surface

Back 20

Incremental Lines of Retzius

Front 21

Incremental Lines of Retzius cross section

Back 21

appear as concentric rings

Front 22

accentuated incremental line of Retzius

Back 22

Neonatal Line

Front 23

result of abrupt change in the environment that occurs at or near birth

Back 23

Neonatal Line

Front 24

also called Nasmyth’s membrane

Back 24

Enamel Cuticle

Front 25

covers the entire crown of a newly erupted tooth

Back 25

Enamel Cuticle

Front 26

enamel cuticle eventually replaced by

Back 26

pellicle

Front 27

thin, leaf-like structures

Back 27

Enamel Lamellae

Front 28

extends from enamel surface towards DEJ

Back 28

Enamel Lamellae

Front 29

traverse entire length of crown

Back 29

Enamel Lamellae

Front 30

projects from DEJ towards enamel proper

Back 30

Enamel Tuft

Front 31

found at inner one third of enamel

Back 31

Enamel Tuft

Front 32

originates from odontoblastic processes that extends into the enamel epithelium before hard substances were formed

Back 32

Enamel Spindles

Front 33

may serve as pain receptors

Back 33

Enamel Spindles