Chapter 20 Flashcards Preview

Dental Anatomy > Chapter 20 > Flashcards

Flashcards in Chapter 20 Deck (76)
Loading flashcards...
1

where does the ameloblasts lay down a matrix of mucopolysaccharide and organic fiber next to the dentin matrix?

Dental papilla

2

Where is the CEJ formed?

Dental Papilla

3

What has genetic control over the tooth shape?

Dental papilla

4

What is the hardest structure of the body?

Enamel

5

Enamel is generally what color?

White

6

Enamel can appear what color at times and why?

yellowish because of the reflection of the underlying dentin

7

Composition of enamel is

96% inorganic (Hydroxyapatite)

8

Other 4% of enamel is composed of what

Water and fibrous organic material

9

Enamel rod is made up of what?

Hydroxyapatite crystals.

10

What is the primary unit of enamels structure?

Enamel Rod

11

a column of enamel that runs from the Dentinoenamel Junction to the surface of the tooth

Enamel Rod

12

Enamel rod is Perpendicular to

The DEJ and the surface of the crown

13

Lays down matrix to form enamel

Ameloblasts

14

where does Ameloblasts begin to lay down Matrix

At the tip of the cusp and then further toward the cervical line

15

Ameloblast lying down matrix is referred to as

the mineralization stage of enamel rod calcification

16

The second stage of calcification is called the

Maturation stage

17

what happens in Maturation stage

Crystals should grow in size until they are tightly packed together

18

When is there a change in development of the enamel rod

every 4 days

19

when change in development of enamel rod occurs and a brownish line develops in the enamel it is called

Striae of retzius

20

On the labial surface of the crown you can se horizontal lines on the crown due to

Striae of Retzius

21

Horizontal lines that can be seen on crown of Anterior teeth are called

Imbrication lines.

22

Imbrication lines are

surface manifestations of the striae of retzius

23

The final job of ameloblasts is to

lay down a protective layer over the enamel

24

Protective layer of the enamel created by ameloblasts is called

Primary enamel cuticle

25

Another name for Primary enamel cuticle is

Nasmyths membrane

26

Nasmyths membrane (Primary Enamel Cuticle) covers

the crown and remains there for many months after eruption until worn away by toothbrushing and other abrasion

27

when spots or entire areas of the teeth appear white to whitish yellow in color

Hypocalcified enamel

28

hypocalcified enamel the result of

insufficient growth of the enamel crystals or an insufficient number of crystals originally deposited in the matrix

29

hypocalcification can be termed

Soft teeth

30

soft teeth (hypocalcification) can decay

More rapidly