Adhesion

Question 1

What does acid-etch do

Answer 1

Removes smear layer

Question 2

What happens to the collagen after placing bond

Answer 2

collagen network becomes more active

Question 3

GIC has been used to ……. ……. process

Answer 3

control caries

Question 4

Biodentine is a massive outflow of …..

Answer 4

calcium hydroxide

Question 5

Pulpal actions of calcium hydroxide

Answer 5

increases mineralization

Question 6

Polymers is a large molecule repeated of structural units connected by covalent chemical bonds, they are used in dentistry for….

Answer 6

• composites
• acrylic dentures
• alginate
• silicone impression (putty)

Question 7

2 main methods for synthesising polymers

Answer 7

1. Addition
2. Condensation

Question 8

We conduct ……… when we use a ……. to ……… dental composite

Answer 8

polymerisation
light
cure

Question 9

Addition of polymerisation is the joining of ….. …….. to form a …….. larger molecule

Answer 9

two molecules
third

Question 10

3 steps of Addition polymerisation

Answer 10

1. Initiation
2. Propagation
3. Termination

Question 11

Incremental curing is composite is required due to….

Answer 11

• the limited cure depth
• reduce shrinkage stress
• “the depth of cure”

Question 12

Combination of …… and …… is used to improve the degree of polymerisation

Answer 12

heat
light

Question 13

Condensation polymerisation is the reaction between …. …….. and then a small ……… is ………..

Answer 13

two molecules
molecule
eliminated

Question 14

Why are composites so widely used?
List 4

Answer 14

• withstand the environment in the oral cavtiy
• easily shaped to anatomy of tooth
• match tooth colour
• bond directly to tooth tissue

Question 15

3 Contraindications of composite

Answer 15

• poor isolation
• larger posterior restorations
• bruxism

Question 16

2 Major constituents for composite

Answer 16

• high molecular weight monomers
• fillers

Question 17

What reduces viscosity in resin monomer

Answer 17

diluent monomers (minor component)

Question 18

Inhibitors are a minor component in resin monomers which are added to prevent ……… ………. during storage, handling and placement

Answer 18

premature polymerisation

Question 19

What particles are seen to improve the properties of composite

Answer 19

smaller particles

Question 20

The higher the filler content the …….. the polymerisation ………..

Answer 20

lower
shrinkage

Question 21

Filler particles are important in composite because they……
list 4

Answer 21

• reduce polymerisation shrinkage
• improves surface hardness
• improves mechanical properties (elasticity, strength)
• improves aesthetics

Question 22

Silane coupling agents …….. the adhesion between the …… and the ……… matrix

Answer 22

enhances
filler
polymer

Question 23

Polymerisation shrinkage plays a significant role in restoration failure which can lead to …. 4 things

Answer 23

1. gap formation
2. secondary caries formation
3. marginal leakage
4. post-operative sensitivity

Question 24

The maximum thickness of a layer of composite that can be cured is the measure of ………. … ……….

Answer 24

“depth of cure”

Question 25

On curing a limited thickness of composite undergoes ............ so composites have a limited ...... ......... .......

Answer 25

polymerisation depth of cure

Question 26

3 types of composites

Answer 26

1. Nanocomposites 2. Flowable composites 3. Bulk filled composites

Question 27

4 Properties of Nanocomposites

Answer 27

1. nano sized particles (very small) 2. low polymerisation shrinkage 3. good aesthetics 4. high flexural strength

Question 28

Nanocomposites have a very smooth surface which makes them have a high polish retention which makes them good for (5)

Answer 28

- long lasting aesthetics - reduced plaque adhesion - reduced risk of secondary caries - reduced risk of gingival inflammation on class V - high oral comfort

Question 29

Flowable composites gives rises to ..... ........ ........

Answer 29

high contraction stresses

Question 30

Flowable composites have a reduced amount of ...... ....... making them a lot more ........ but with a higher shrinkage rate

Answer 30

filler content flexible

Question 31

Flowable composites are now recommended to only us as 3 things

Answer 31

liners fissure sealants small restorations

Question 32

What does pre-warming composite do

Answer 32

Enhances flow of composite as viscosity decreases , better for placement

Question 33

What are bulk-filled composites

Answer 33

- composites that do not require incremental curing - can cured up to depths of 4-5mm