Resin Composite Restorative Materials

Question 1

The four major components of standard composite materials are:

Answer 1

Organic Polymer Matrix
Inorganic Filler Particles
Coupling Agent
Initiator-accelerator system

Question 2

Organic Polymer Matrix is made up of what 3 oligomers?

Answer 2

Bis-GMA, U-DMA, TEG-DMA

Question 3

Microfilled composites are used for non-stress-bearing ____ restorations and are ___ polishable.

Answer 3

esthetic, highly

Question 4

In coupling agents, a bond must form between the ____ and the ____ during setting.

Answer 4

inorganic filler, organic oligomer (organic polymer matrix)

Question 5

What composite material usage is described below?

During the setting of the oligomer the double bonds of the silane react with the oligomer to form a link from the filler through the coupling agent to the oligomer to the polymer matrix.

Answer 5

Coupling Agents

Question 6

____ is a Visible-Light Activator that absorbs blue light in the ____ nm range.

Answer 6

Camphorquinone, 400 - 500 nm

Question 7

In composites, unreacted double bonds may be as high as ___% at the air inhibited surface layer.

Answer 7

75

Question 8

Bond failure at the interface results in ____.

Answer 8

microgap formation

Question 9

Bond failure resulting in microgap formation leads to:

Answer 9

• influx of oral fluids
  - marginal staining
  - secondary caries
• post operative sensitivity

Question 10

____ is a direct function of the volume fraction of polymer in the composite.

Answer 10

Polymerization shrinkage

Question 11

____ composites have a higher volume % of polymer = more shrinkage (2-4%)

Answer 11

Microfilled

Question 12

____ composites have less polymer matrix and may be stiffer but have less shrinkage.

Answer 12

Microhybrid

Question 13

____ composites have more polymer present = more expansion.

Answer 13

Microfilled

Question 14

Microfilled composites have E value of only ___ to ___ that of more highly filled Fine particle composites.

Answer 14

1/4 to 1/2