Lecture 14- Teeth Flashcards Preview

Histology > Lecture 14- Teeth > Flashcards

Flashcards in Lecture 14- Teeth Deck (19)
Loading flashcards...
1
Q

What is the hardest component of the body?

A

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

2
Q

Describe the production of enamel during tooth development

A

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
Q

How are enamel rods configured?

A
  • key hole configuration
  • each rod is produced by an ameloblast
  • oriented obliquely around tooth
4
Q

Can you see enamel in sections of teeth?

A

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

5
Q

What type of cells produce dentin?

A

Odontoblasts

6
Q

Where are odontoblasts found?

A

Pulp cavity

7
Q

What do odontoblasts produce?

A

Predentin- unmineralized organic matrix

8
Q

What do odontoblasts leave behind when they retreat?

A

Odontoblastic process in the dentinal tubule. Dentin becomes mineralized

9
Q

What makes up dentin?

A
  • Type 1 collagen
  • Ground substance (Glycosaminoglycans)
  • Hydroxyapatite crystals (more than bone, harder)
10
Q

What is in tooth pulp? (6)

A

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

11
Q

How does the tooth stay in the socket?

A

Periodontum- the tissues involved in attachment of tooth to bone

12
Q

What makes up the periodontium? (4)

A
  • Gingiva
  • Cementum
  • Periodontal Ligament
  • Alveolar Bone
13
Q

What tissue makes up the free gingiva?

A

Stratified squamous epithelium, keratinized

14
Q

Is the sulcular epithelium keratinized?

A

No

15
Q

In the junctional epithelium keratinized?

A

No

16
Q

What helps join the junctional epithelium to the tooth?

A

Hemidesmosomes

17
Q

What cells make cementum?

A

Cementoblasts

18
Q

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

A

Fibroblasts

19
Q

What are the functions of the PDL? (5)

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