Lecture 14- Teeth Flashcards Preview

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Flashcards in Lecture 14- Teeth Deck (19):
1

What is the hardest component of the body?

Enamel- 96% mineralized made up of calcium and phosphate crystals

2

Describe the production of enamel during tooth development

1) Ameoblast secretes amelogenin and enamelin
2) Matrix is mineralized
3) Organic material removed from material and replaced by more Ca and P
4) tooth erupts and ameoblasts fall off

3

How are enamel rods configured?

- key hole configuration
- each rod is produced by an ameloblast
- oriented obliquely around tooth

4

Can you see enamel in sections of teeth?

Yes, but only in ground teeth. The growth lines are the horizontal lines in the picture.

5

What type of cells produce dentin?

Odontoblasts

6

Where are odontoblasts found?

Pulp cavity

7

What do odontoblasts produce?

Predentin- unmineralized organic matrix

8

What do odontoblasts leave behind when they retreat?

Odontoblastic process in the dentinal tubule. Dentin becomes mineralized

9

What makes up dentin?

- Type 1 collagen
- Ground substance (Glycosaminoglycans)
- Hydroxyapatite crystals (more than bone, harder)

10

What is in tooth pulp? (6)

1) Blood vessels
2) Collagen
3) Fibroblasts
4) Immune cells
G) Odontoblasts
H) Pain nerve fibers

11

How does the tooth stay in the socket?

Periodontum- the tissues involved in attachment of tooth to bone

12

What makes up the periodontium? (4)

- Gingiva
- Cementum
- Periodontal Ligament
- Alveolar Bone

13

What tissue makes up the free gingiva?

Stratified squamous epithelium, keratinized

14

Is the sulcular epithelium keratinized?

No

15

In the junctional epithelium keratinized?

No

16

What helps join the junctional epithelium to the tooth?

Hemidesmosomes

17

What cells make cementum?

Cementoblasts

18

Which cells in the PDL produce the ground substance and Type 1 collagen fibers?

Fibroblasts

19

What are the functions of the PDL? (5)

- connect bone to cementum
- absorb shock
- sensory
- blood supply/nutriends
- remodeling via mesenchymal stem cells into osteoblasts, fibroblasts, or cementoblasts