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2ND Year - CSA clinical aspects > Clinical aspects: Composites > Flashcards

Clinical aspects: Composites Flashcards

1
Q

What is composite made up of?

A
  1. Matrix
  2. Fillers
  3. Coupling agents
  4. Initiators and accelerators
  5. Pigments
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2
Q

What is composite made up of?

A

A resin matrix

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3
Q

Name the steps required to make composite

A
  1. Resin matrix
  2. Filler particles
  3. Coupling agent
  4. Optical modifiers/ pigments
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4
Q

What is the resin matrix in compsite made up of?

A

Bis GMA
UDMA
TEGDMA
HEMA

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5
Q

Which material in resin matrix make it viscous?

A

The viscous monomers:

Bis GMA and UDMA

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6
Q

What is composite called if it just made up of resin?

A

Unfilled resin

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7
Q

Why cant composite just be made up of resin?

A

As it absorbs water
It stains and discolours
It isn’t wear resistant

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8
Q

What do we add to the resin matrix to make it more resistant ?

A

Filler particles

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9
Q

What are filler particles made up of?

A

Silica particles
Quartz
Glass (Ba, Sr and Zr)

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10
Q

What would composite be called if it was only made up of filler and resin?

A

Filled resin

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11
Q

What are composites usually classified by?

A

Their filler size eg micro filled or nano filled

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12
Q

What does the filler size determine?

A

Determines the surface smoothness

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13
Q

What is the general relationship between filler sze and composite surface?

A

Larger the particle size the rougher the surface

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14
Q

If you increase the filer CONTENT how does that change the properties of composite

A
  1. Increase in hardness/ strength
  2. Increase in abrasion resistant
  3. Handling changes
  4. Aesthetics change
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15
Q

What is the general relationship between filer content and resin content?

A

As filler content increases the resin content decreases

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16
Q

What problem do filler particles and the resin matrix have?

A

They don’t mix as flller is inorganic and resin is organic

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17
Q

What do we add to composite to help aid the mixing of filler and resin?

A

Coupling agent

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18
Q

What is coupling agent?

A

It is organosilane (a bifunctional molecule)

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19
Q

How does the coupling agent work?

A
  1. The silicane bonds to the hydroxyl group of the filler particles
  2. Methacrylate end of the agent polymerises with resin
    So the agent brings together resin and composite
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20
Q

What do we add to our composite mixer of resin, filler and coupling agent to make it more aesthetic?

A

Optical modifiers/ pigments

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21
Q

What does the optical modifier/ pigment provide?

A

Provides translucency and opacity

22
Q

What are optical modifiers/ pigments made of?

A

Metal oxides:
Titanium dioxide
Aluminium oxide

23
Q

Name the 3 materials that make up the basic composition of composite?

A
  1. Resin matrix
  2. Filler particles
  3. Silane coupling agents
24
Q

Name the most common type of composite we use in clinic

A
  1. Light activated composite
25
Q

What type of reaction occurs in light activates composite?

A

Free radical reaction

26
Q

What do we need to add to light activated materials?

A

Add something to stop it from activating in the bottle or direct exposure to light

27
Q

Name some chemicals we add to light activated composite

A
  1. Photo inhibitor (camphorquinone)
  2. Amine accelerator (Diethyl-amino-ethyl-methacrylate)
  3. Polymerisation inhibitor ( Hydroquinone)
28
Q

Why so we add a polymerisation inhibitor to light activated composite?

A

It prevents setting during storage

29
Q

Name some light sources we can use to activate light activated composite

A
  1. Blue light emiiting diode
  2. Plasma arch light
  3. Argon laser
  4. Halogen light
30
Q

Why can we only use certain light sources when setting light activated composite?

A

As you need an ideal wavelength to start the free radical reaction

31
Q

Name some composites that have been classified by filler size

A
  1. Macro-filled
  2. Small particles
  3. Hybrid
  4. Micro filled
  5. Nano hybrid
  6. Nano filled
32
Q

How big is the filler in macro filled composite and what is the filler loads?

A

8-12 micro metres

75-80%

33
Q

How big is the filler in small particle composite and what is the filler loads?

A

1-8 micro metres

70-85%

34
Q

How big is the filler in hybrid composite and what is the filler loads?

A

0.4-1 micrometre

70-75%

35
Q

How big is the filler in micro filled composite and what is the filler loads?

A

0.04-0.4 micro metres

50-60%

36
Q

How big is the filler in nano hybrid composite and what is the filler loads?

A

0.02-2.5 micro metre

70-75%

37
Q

How big is the filler in nano filled composite and what is the filler loads?

A

Culsters of 0.06-1.4 micro metres (5-20nm)

70-75%

38
Q

What are the short coming of light cured composite?

A
  1. Polymerisation shrinkage
  2. It is technique sensitive
  3. It is highly affected by moisture
  4. It doesn’t bond to the tooth on its own
39
Q

What does composite need to be able to bind to the tooth?

A

A bonding agent

40
Q

By what reaction does polymerisation shrinkage occur?

A

Addition polymerisation

41
Q

Check slide 15

A

Check slide 15

42
Q

Check slie 15

A

Make q fro m slide 15

Make Q from slide 15

43
Q

Make q from slide 15

A

Make Q from slide 15

44
Q

slide 15

A

Sldie 15

45
Q

Slide 15

A

Slide 15

46
Q

Why is polymerisation shrinkage bad?

A

As it leads to the development of gaps

47
Q

Why is it a problem if gaps develop following composite placement?

A

Leads to :

  1. secondary caries
  2. Staining
  3. Sensitivity
  4. Build up of food in the gaps
  5. Harder to clean
48
Q

How can we achieve moisture control when placing a composite fillign?

A
  1. Cotton wool rolls

2. Rubber dam

49
Q

What is important to note before placing a rubber dam?

A

Make sure the patient has good gingival health

50
Q

Where can moisture control not be achieved?

A

Subgingival restorations

2ND Year - CSA clinical aspects (4 decks)

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