Enamel, Dentin, Cementum Flashcards Preview

NBDE Dental Anatomy > Enamel, Dentin, Cementum > Flashcards

Flashcards in Enamel, Dentin, Cementum Deck (13):
1

What is the main component of enamel

Inorganic matter (NOT collagen)

Mainly hydroxyapetite a crystalline calcium phosphate

2

Enamel rods positioning in primary (decidous) vs permanent teeth in the cervical third

  • Decidous teeth- rods are more vertical 
  • Permanent- rods in gingival direction
  • Rods are typically perpendicular to the Dental-Enamel-Junction

3

What germ layer does enamel come from?

The ectoderm

All other dental tissues come from the mesoderm (mesenchyme)

4

Perikymata and Striae of Retzius

  • Perikymata
    • Depressed furrows on enamel surface as a result of enamel spposition
  • Striae of retzius
    • Point incisally from DEJ, form concentric circles

5

For multi rooted teeth dentin continues to form most rapidly at the ____ and ____

Floor and roof of the pulp chamber

6

Dentin composition

70% Inorganic hydroxyapetite

20% Collagen

7

What is the PRIMARY function of the dental pulp

Form dentin

Its secondary function is to nourish and provide sensation

8

Dentin is formed by 

Dental papilla and dental pulp

9

Which dentin is most mineralized

Intra or peritubular dentin

This is the dentin that is wrapped around the odontoblastic process

10

The softest dental tissue is

Cementum

11

What are the 2 types of cementum

  • Acellular
    • Coronal 2/3
  • Cellular
    • Apical 1/3 
    • Near the blood supply

12

Cementum functions

Seals the tubules of root dentin

Attachment for periodontal fibers

13

Cementum Composition

50% Inorganic hydroxyapetite calcium

50% Organic (water, type I collagen, proteins)