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Module 3 Dental Materials > Resin composites I > Flashcards

Resin composites I Flashcards

1
Q

Earliest tooth coloured restorative material

A

silicates

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2
Q

Restorative material used in the 1960s to 1980s

A

acrylics

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3
Q

Draw back of acrylics

A

limited working time

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4
Q

Acrylic powder

A

polymethyl methacrylate

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5
Q

Acrylic setting reaction

A

free radical addition polymerisation

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6
Q

4 stages of free radical addition polymerisation

A

activation, initiation, propagation and termination

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7
Q

What happens to the material on polymerisation?

A

contracts

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8
Q

Why are acrylics better than silicates?

A

less prone to erosion and less brittle

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9
Q

What did Knock and Glenn introduce?

A

filler particles to reduce shrinkage although weakened material

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10
Q

What did Bowen introduce?

A

coupling agent and filler particle bonded

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11
Q

resin composite definition

A

combination of two chemically different materials and properties which could not be achieved by any of the components acting alone

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12
Q

Resin matrix components

A

methacrylate or dimethacrylate, TEGMA controls viscocity and an inhibitor

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13
Q

Resin matrix components

A

methacrylate or dimethacrylate, TEGMA controls viscocity and an inhibitor

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14
Q

silorane structure

A

ring structure

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15
Q

silorane feature

A

slight expansion despite overall contraction

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16
Q

3 examples of filler

A

quartz, silica and glasses

17
Q

glass fillers are radiolucent or radiopaque?

A

radiopaque as all have heavy metals

18
Q

Example of coupling agent

A

Vinal silane

19
Q

What increases as filler content increases?

A

surface hardness

20
Q

What does the addition of a filler do?

A

decrease percentage volume by setting and thermal expansion

21
Q

Light activator for resin composite?

A

camphorquinone

22
Q

what does camphorquinone yield?

A

free radicals to start polymerisation

23
Q

What wavelength does camphorquinone become excited at?

A

460-480nm

24
Q

What is resin susceptible to?

A

shrinkage upon polymerisation

25
Q

What does the coupling agent do?

A

shock absorber - transfer stress from filler to matrix

26
Q

4 types of resin composites?

A

conventional, microfilled, hybrid and nanocomposites

27
Q

Advantage of light activation over chemical activation?

A

extended working time

28
Q

What does tribology cause?

A

wear of resin

29
Q

As filler increases, what happens to the thermal expansion

A

decreases

30
Q

What does increased porosity decrease?

A

strength

31
Q

What does increased coupling increase?

A

strength

32
Q

Calculation to determine c-factor?

A

no. bonded surfaces/no. unbonded surfaces

33
Q

Why is the c-factor important?

A

important as composite shrinks

Module 3 Dental Materials (8 decks)

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