Dent 1020 Ch 12

Front 1

Hardest and most durable tissue in the Human Body is...

Back 1

Enamel

Front 2

What % is inoragnic, what % is organic, and what % is water?

Back 2

96 % inorganic (mineralized), 1% organic, 3% water

Front 3

What makes up most of the inorganic component? (65%)

Back 3

Calcified Hydroxyapatite

Front 4

Enamel is avascular or vascular?

Back 4

Avascular (also no nerve endings which makes it nonvital, nonrenewable)

Front 5

T or F: Enamel can be formed after ameloblasts are gone

Back 5

FALSE- NO more enamel can be formed after ameloblasts are gone.

Front 6

REE adheres to the ____ and forms the _____

Back 6

Anatomical crown & the enamel cuticle (enamel cuticle can become calcified and cause intrinsic staining)

Front 7

What color is enamel?

Back 7

Enamel can be a variety of shades of bluish white. Deciduous teeth are more opaque white.

Front 8

Enamel matrix is formed by...

Back 8

The Tome's processes (of the ameloblasts)

Front 9

Enamel matrix formation starts at the...

Back 9

incisal/occlusal edge and progresses cervically.

Front 10

Mineralization occurs from the...

Back 10

Inside-out (near the DEJ occurs first)

Front 11

What are enamel rods?

Back 11

The structural unit of enamel.

Front 12

What shape are they in cross section?

Back 12

Key-hole shaped!!

-This interlocking adds strength

Front 13

An entire rod takes how many ameloblasts to produce?

Back 13

4 ameloblasts.
Tail takes 1 ameloblast to produce, and the head takes 3

Front 14

What does the interprismatic Region (interrod) form?

Back 14

It forms the outer portion of each enamel rod; between individual enamel rods.

Front 15

With the interprismatic region the matrix is less or more mineralized (calcified)?

Back 15

LESS mineralized

Front 16

T or F, DEJ (Dentoenamel junction) is scalloped.

Back 16

TRUE. (Not straight)

Front 17

Convex portion (of scalloped edge) is toward the ____ and concave portion is toward the ____

Back 17

Dentin & enamel.

Front 18

Lines of Retzius:

Back 18

Incremental growth lines that mark period of enamel formation.

Appear as cross striations on the enamel rods

Front 19

Lines of Retzius helps form the____ and ______

Back 19

Perikymata (smaller horizontal bands) and Imbrication lines.

Front 20

Neonatal Line is formed by...

Back 20

a traumatic even of birth

-on primary teeth and cusps of permanent teeth (1st molars only)

Front 21

Enamel spindles are...

Back 21

Projections of dentinal tubules.

More common under cusps and incisal edges.

Front 22

Enamel Tufts are...

Back 22

Brush-like faults formed by abnormal crystallized enamel.

Base is near DEJ

(smoke like)

Front 23

Enamel Lamellae

Back 23

partially calcified vertical faults,

extend from the DEJ to the surface

Front 24

In what two areas can caries progress more rapidly because they are less mineralized?

Back 24

Enamel Tufts (smoke like things) and the Enamel Lamella areas ( the cracks)

Front 25

Once enamel is formed can it be destroyed by any normal physiological process?

Back 25

Nope :)

Front 26

Attrition: (please know this ;))

Back 26

Wear of the occlusal/incisal and to some extent proximal surfaces

Front 27

Other abnormalities

Back 27

-Amelogenesis Imperfecta

-Hutchinson's incisors

-Enamel Dysplasia

-Hypocalcification

-Hypoplasia

-Hypermineralization

-Fluorosis

-Abfraction