Tooth Histology

Question 1

How to study enamel histologically

Answer 1

Question 2

Enamel structure

Tightly packed…Crystals

Answer 2

Hydroxyapatite

Question 3

What is this?

Answer 3

Enamel

Question 4

Enamel Prism

Shape

Orientations

Answer 4

Complex “key hole” shape

From different orientations of the hydroxyapatite crystals

Question 5

Gnarled Enamel

Where is it found?

Answer 5

Cusps of the tooth. Prisms twisted around each other for strength.

Question 6

Striae of Retzius

What are they?

Answer 6

Incremental growth lines representing ~weekly growth

Question 7

Perikymata

What is it?

Answer 7

A shallow furrow where the striae reach the surface

Question 8

Dentine Collagen

What does it provide?

Runs in what orientation?

Answer 8

Strength to the dentine (like reinforced concrete)

Mainly parallel to ADJ

Question 9

Dentinal Tubules

Answer 9

Question 10

DentineTubules

Answer 10

Dentine is highly tubularTubules are continuous with pulp and may contain cell processes, nerves and fluid

Question 11

Tubule Density

Answer 11

Question 12

Tubule Curvatures

Answer 12

Question 13

What can be in the dentinal tubules?

Answer 13

Question 14

Nerves in Dentine

Summary

Answer 14

Dentine sparsely innervated with most in pre-dentine and inner dentine in pulp horns. Few at cervial margin which is clinically a sensitive area.

Question 15

Dentine Classificaton

Primary Dentine

Answer 15

Formed during tooth development (up to root completion)

Question 16

Tertiary Dentine

Localised

Answer 16

Under stimulus

Question 17

Types of Cementum

Answer 17

Question 18

Dental Pulp Gross Anatomy

Answer 18

Question 19

Pulp vs Connective Tissue

Answer 19

Question 20

Pulp in Dentine

Answer 20

Question 21

Enamel structure

Basic unit

Answer 21

Enamel prism (rod)

Question 22

Enamel structure

Prisms visible in…

Answer 22

Ground sections or SEM’s of acid etched enamel

Question 23

Dentine Classificaton

Secondary

Answer 23

Formed after root completion and forms slowly throughout the life of the tooth

Question 24

Dentine Classificaton

DentineTertiary Dentine

Answer 24

Response to pulpal insult

Question 25

**_Tertiary Dentine_** Reactionary

Answer 25

Existing odontoblasts destroyed and newly differentiated ones are recruited.

Question 26

**_Tertiary Dentine_** Reparative

Answer 26

Forms rapidly and has poor structure

Question 27

**_Tertiary Dentine_** Function

Answer 27

Remove pulp from stimulus