Dentine Caries Flashcards Preview

BDS 2: Adult Restorative > Dentine Caries > Flashcards

Flashcards in Dentine Caries Deck (23)
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1

What is the structural composition of dentine?

- 70% inorganic
- 20% organic
- 10% water

2

What do odontoblasts differentiate from?

Differentiate from cells of dental papilla

3

What do odontoblasts secrete? How do these help in the formation of mantle dentine?

Odontoblast process secretes HAP crystals that mineralize collagen matrix

4

How are dentine tubules linked to odontoblasts?

Dentine tubules contain cytoplasmic processes of odontoblasts

5

What is the width of the dentine tubules at

Pulp?
EDJ?

- Widest near pulp 2.5µm

- Narrowest at EDJ 0.9µm

6

Describe the location of the dentine tubules

Extend from odontoblast layer at pulp to enamel-dentine junction

7

Primary dentine;

When is it laid down?
Dentine-pulp complex response?

- Laid down in dentinogenesis

- Normal dentine-pulp complex response

8

Secondary dentine;

When is it laid down?
Dentine-pulp complex response?

- Laid down throughout life

- Normal dentine-pulp complex response

9

Tertiary dentine;

When is it laid down?
Dentine-pulp complex response?

- Laid down in response to noxious stimuli

- ‘Altered’ dentine-pulp complex response

10

What occurs to lesions during late enamel caries?

What response is initiated?

Progressing legions approach EDJ, which initiates defensive dentine pulp reactions

11

What occurs to lesions during dentine caries?

Lesions crosses EDJ and spreads into dentine

12

Why is there lateral spread at the EDJ for dentine caries? (3)

- Dentine mantle is hypo mineralised
- Increased side branching of tubules
- Defects within tissues of EDJ

13

When can you no longer reverse dentine caries?

Infected dentine tubules cause proteolytic dissolution

14

Explain clinically what a caries infected zone is

Appearance?
Mineral components?
Collagen?
Bacterial load?
Dentine tubules?

- Dark brown, soft, wet, ‘mushy’
- Mineral component dissolution
- Collagen matrix denatured
- High bacterial load
- Dentine tubules destroyed

15

Explain clinically what a caries affected zone is

Appearance?
Mineral components?
Collagen?
Bacterial load?
Dentine tubules?

- Sticky, scratchy, leathery
- Mineral component dissolution (lesser degree)
- Collagen matrix damaged by proteolysis but not denatured
- Lower bacterial load
- Dentine tubules remnants intact

16

What does the dentine-pulp complex do?

Excrete dentine in response to injury

17

What are the two types of tertiary dentine?

- Reactionary dentine
- Reparative dentine

18

What is the role of peritubular dentine in the dentine pulp complex to stop the progression of carious lesions?

Peritubular dentine occludes cut dentine tubules which prevents further injury

19

Reactionary dentine;

Where is it laid down?
What does it do?
Response to what severity of stimulus?
Fate of odontoblasts?

- Tertiary dentine laid down at dentine-pulp interface
- Increases distance between dentine-pulp and stimulus
- Low grade stimulus
- Odontoblasts survive

20

Reparative dentine;

Where is it laid down?
What does it do?
Response to what type of stimulus?
Fate of odontoblasts?

- Tertiary dentine laid down at dentine-pulp interface
- Increases distance between dentine-pulp and stimulus
- Higher grade stimulus
- Odontoblasts vitality compromised (become dead cells)

21

Which tertiary dentine type is deposited quicker once stimulated?

Reparative is deposited much faster than reactionary

22

What dental condition does noxious stimuli lead to for the pulp?

Noxious stimuli leads to inflammation of pulp (Pulpitis)

23

Slow progressing lesions;

Type of pulpitis?
Cellular changes?
What cells begin to arise?

- Chronic Pulpitis
- Fibrosis within pulp
- Plasma Cells and Lymphocytes arising