Microscopic Features Of Mature Enamel

Front 1

What is the crystalline structural unit of the enamel?

Back 1

Enamel rods (enamel Prisms)

Front 2

enamel is composed of how many enamel rods?

Back 2

Millions

Front 3

Each enamel rod is what in the longitudinal section?

Back 3

Cylindrical

Front 4

Each enamel rod is what length in diameter with what?

Back 4

4 micrometers with head and tail ends

Front 5

What affects the crystal's pattern?

Back 5

ameloblast and tomes processes

Front 6

Where are enamel rods found?

Back 6

rows along the tooth

Front 7

The long axis of the enamel rod is usually what to the underlying dentin

Back 7

Perpendicular

Front 8

In permanent teeth the enamel rods near the CEJ do what?

Back 8

Tilt slightly toward the root of the tooth

Front 9

Most enamel rods extend the width of the enamel from the?

Back 9

DEJ to the outer enamel surface

Front 10

Which enamel rods are longer?

Back 10

The ones near the cusp or incisal edges

Front 11

Which enamel rods are shorter

Back 11

The ones near the CEJ

Front 12

The curved course of the enamel rods reflect what?

Back 12

movement of ameloblast during enamel production

Front 13

What surrounds the outer part of the rods?

Back 13

Interprismatic region

Front 14

The convex side of the the DEF is toward what?

Back 14

Dentin

Front 15

The concave side of the DEJ is toward the what?

Back 15

Enamel

Front 16

The DeJ was formerly what?

Back 16

The basement membrane between the enamel organ and dental papillae

Front 17

The DEJ is most pronounced where?

Back 17

Coronal region

Front 18

The Rods show varying degrees of curvature where?

Back 18

From the DEJ to the outer enamel surface

Front 19

The lines of retzius appear as what?

Back 19

Incremental lines that appear brown in a stained section of mature enamel

Front 20

What appears as incremental lines that appear brown in a stained section of mature enamel

Back 20

Lines of Retizius

Front 21

On transverse sections of enamel, the lines of Retizuis appear as what?

Back 21

Concentric Rings

Front 22

What is associated with the lines of Retzius

Back 22

Raised Imbrication lines and grooves of Perikymata on the

nonmasticatory surfaces on some teeth

Front 23

Imbrication lines are usually lost because of what? Except for where?

Back 23

Tooth Wear

Except on protected cervical regions

Front 24

Imbrication lines can be confused as what?

Back 24

Calculus

Front 25

What are neonatal lines?

Back 25

Pronounced incremntal lines of Retzius

Front 26

What do neonatal lines mark?

Back 26

The stress or trauma experienced by the ameloblast during birth

Front 27

The stress or trauma experienced by the ameloblast during birth are marks called what?

Back 27

Neonatal Lines

Front 28

Microscopically the darker neonatal lines marks the borders of what?

Back 28

border between the enamel matrix formed before and after birth

Front 29

What teeth are neonatal lines mostly found on

Back 29

All primary teeth

larger cusp of permanent first molars

Front 30

Neonatal lines contain what?

Back 30

Irregular structures of enamel prisms with disordered crystal arrangements

Front 31

ENAMEL SPINDLES

Back 31

........

Front 32

Enamel spindles represent what?

Back 32

Short dentinal tubes near the DEJ

Front 33

Enamel Spindles result from what?

Back 33

Odontoblast that crossed the basement membrane before it mineralized into the DEJ

Front 34

Enamel Spindles are mainly noted on what teeth?

Back 34

Beneath the cusp and incisal tips of the teeth

Front 35

ENAMEL TUFTS

Back 35

...............

Front 36

Enamel tufts are noted as what?

Back 36

Small dark brushes with their bases near the DEJ

Front 37

Enamel Tufts are best seen where?

Back 37

Transverse sections of enamel

Front 38

Enamel Tufts are found where in the enamel

Back 38

inner one third of enamel

Front 39

What do enamel tufts represent what?

Back 39

areas of less mineralization

Front 40

ENAMEL LAMELLAE

Back 40

.................

Front 41

Enamel lamellae are what?

Back 41

Partially mineralized vertical sheets of enamel matrix that

extend from the DEJ near the tooth's cervix to the outer occlusal surface

Front 42

Enamel Lamellae are what compared to Enamel Tufts

Back 42

Narrower and longer