Composites

Question 1

Name the type of Composite used for dentine and why

Answer 1

Chemical cure
- Increased porosities
- Colour degradation due to amide linkages
- Does not polish as well

Question 2

How many cusp tips lower 5

Answer 2

3

Question 3

How many cusp tips upper 5

Answer 3

2

Question 4

How many cusp tips lower 6

Answer 4

5

Question 5

How many cusps tips lower 7

Answer 5

4

Question 6

Where is marginal ridge in relation to central disecting groove in most teeth

Answer 6

At 45 degree angle

Question 7

Describe upper 6 Anatomy

Answer 7

2 buccal cusps 1/2 each
2 Palatal cusps mesial 2/3 and distal 1/3

Question 8

Name two teeth where the marginal ridge is not at 45 degrees to the central disecting groove

Answer 8

Lower 5
Lower 6

Question 9

Define fossae

Answer 9

Where opposing cusps meet

Question 10

Describe Anatomy lower 5

Answer 10

3 cusp tips
Buccal 1 cusp marginal ridge at 90 degrees to central disectional groove
Palatal 2 cusps marginal ridge at 45 degrees to central disectional groove

Question 11

Define hue

Answer 11

Colour of the tooth

Question 12

Define chroma

Answer 12

Saturation or intensity of the hue

Question 13

Define value

Answer 13

Brightness of color light or dark

Question 14

What is c factor

Answer 14

Ratio of bonded to unbonded surfaces

Question 15

What are the different types of composite layering

Answer 15

Horizontal layering
Vertical layering
Oblique layering

Question 16

Which way does a composite shrink

Answer 16

Away from the walls

Question 17

What is the c factor of a class 2 cavity

Answer 17

Ratio 4:2 c factor =2
Bonded = buccal lingual distal base
Unbounded mesial occlusal

Question 18

Class 1 cavity what is the c factor

Answer 18

Ratio 5:1 c factor 5
Bonds ;base, buccal mesial distal lingual
Undonded occlusal

Question 19

Why should flowable line cavity (4)

Answer 19

To wet the floor of the cavity
Reduce air voids
Reduce post op sensitivity
Allow some elasticity to the restoration during curing and function

Question 20

How thick should the dentine layer of composite be

Answer 20

1mm below the top of the cavity

Question 21

What is the advantage of ramped /stepped curing

Answer 21

The Composite cures slower less risk of shrinkage stress

Question 22

Out of horizontal vertical and oblique layering what type provides the most amount of shrinkage

Answer 22

Horizontal

Question 23

Out of horizontal vertical and oblique layering what type provides the most likely to cause post op sensitivity

Answer 23

Vertical layering

Question 24

What are the advantages of layering composite

Answer 24

Stress reduction
Better polymerisation
Better aesthetics
Better Anatomy

Question 25

What does glycerin do on composites

Answer 25

Get rid of the oxygen inhibition layer

Question 26

When and why is a composite resealed

Answer 26

When : after shaping Why: to seal microleakage that has occurred during shaping

Question 27

Young teeth have high A. Value B. Hue C. Chroma

Answer 27

Value

Question 28

When assessing shade where should be assessed

Answer 28

Hydrated tooth Mid 1/3

Question 29

What are the differences between adult front tooth and young teeth

Answer 29

Young teeth : whiter, dentine lobes are fully covered with enamel Adult teeth : thinner enamel thickness, darker dentine , more of an ivory tint

Question 30

What are the advantages of bevelling

Answer 30

Improves etch pattern as prisms are etched at the long axis Stronger bond and seal due to inter and intraprismatic bond

Question 31

What degree is a composite bevel

Answer 31

60 degrees

Question 32

What is the Disadvnatges of bevelling composites

Answer 32

Thin edge of material left Increased risk of chipping and staining Increased risk of white line at the margin Harder to finish tooth coloured Restoration.

Question 33

What are the qualities of resealing after shaping a composite

Answer 33

Resin which goes into the micro fractures eg thermal, fortifill