Dental Material Science

Question 1

Viscoelasticity Definition

Answer 1

Ability to regenerate shape after stress is removed

Question 2

Properties of Stainless Steel (7)

Answer 2

1. Non-corrosive
2. Cheap
3. Flexible
4. Non-toxic
5. Strong
6. Biocompatible
7. Ductile

Question 3

Which dental material acts as a reservoir for F and for how long

Answer 3

(Resin Modified) Glass ionomer
4 weeks

Question 4

For every 500ppmF increase in F, what is the % reduction in caries

Answer 4

6-7

Question 5

Why is F more effective at night

Answer 5

Salivary flow rate decreases overnight

Question 6

Active agent for tooth bleaching

Answer 6

Hydrogen peroxide

Question 7

Products of carbamide peroxide breaking down

Answer 7

Hydrogen peroxide
Urea

Question 8

Constituents of bleaching gel (5)

Answer 8

1. Carbamide peroxide
2. Carbopol
3. Urea
4. Surfactant
5. Desensitising agents

Question 9

Ideal properties of impression materials (4)

Answer 9

1. Quality interaction between tissues and material
2. Accuracy
3. Undercuts/Removal
4. Dimensional stability

Question 10

Test for flow under pressure for impression materials

Answer 10

Shark Fin Test