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Direct/Cariology > Restorative Resin Based Composite Materials > Flashcards

Restorative Resin Based Composite Materials Flashcards

1
Q

What’s the definition of a composite

A

Compound of 2 or more distinctly different materials with properties that are superior or intermediate to those of individual constituents

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2
Q

Are teeth composites

A

yes- the two materials are enamel and dentin

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3
Q

What is the organic matrix of enamel

A

enamelin

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4
Q

What is the inorganic matrix of enamel

A

hydroxyapatite

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5
Q

What is the organic matrix of dentin

A

collagen

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6
Q

what is the inorganic matrix of dentin

A

hydroxyapatite

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7
Q

What are the advantages of resin composite

A
  • Esthetic (emulates tooth structure)
  • Fracture resistant
  • Wear resistance
  • Command set- can sculpt and carve
  • Conservative preparation (most important advantage)
  • Low thermal conductivity (compared to amalgam)
  • Radiopaque
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8
Q

What are the disadvantages of Resin Composite

A
  • Polymerization shrink ~2-4%
  • Requires dental bonding agents (DBA) and light curing (extra step)
  • lengthy placement
  • RD required
  • Marginal leakage and wear resistance (these are no longer issues but they once were)
  • Water sorption- Absorbs H2O causing discorloration and swelling of the restoration
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9
Q

What are the 4 structural components of resin composite

A
  • polymer matrix
  • Inorganic filler
  • Coupling agent
  • Initiator
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10
Q

What is an organic polymer matrix is a __phase to which other materials are __

A

a continuous phase…added

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11
Q

The organic polymer matrix is made out of

A

resin monomers

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12
Q

What are the highly viscous resin monomers (2)

A

Bis-GMA

UMDA

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13
Q

Bis-GMA and UMDA are (high/low) MW monomers

A

high

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14
Q

What are the low MW monomers with low viscosity

A

TEG-DMA and Bis-EMA

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15
Q

Which two monomers listed are low shrinking monomers

A

Bis-EMA and oxybismethacrylate

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16
Q

Inorganic fillers are __ or __ based

A

glass or quartz

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17
Q

What are the three most common inorganic fillers

A

zirconium oxide, aluminum oxide, and silicon dioxide

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18
Q

Filler particles are added to…

A

the organic matrix

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19
Q

Filler is added to the organic matrix in order to improve the

A

physical properties of the resin

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20
Q

In general the (greater/less) the filler the the better the properties of the resin- but there is a limit

A

greater

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21
Q

Why would excess filler lead to an unfavorable resin

A

would become too viscous

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22
Q

Benefits of filler particles

A
  • Improves color stability
  • Reduces H2O sorption
  • Improves compressive and tensile strength
  • Reduces coefficient of thermal expansion
  • Reduces polymerization shrinkage
  • Improves wear resistance
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23
Q

What is another name for a coupling agent in resin

A

silane

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24
Q

What is the role of coupling agent/silane

A

keeps everything together- it oats the filler particles to promote adhesion to the matrix

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25
Q

Other than adhesion of filler particles to the matrix, what is another purpose of coupling agents

A

-provide hydrolytic stability meaning it is more resistant to H2O penetration

26
Q

The Organic matrix is (weak/strong) and the filler is (weak/strong)

A

weak…strong

27
Q

What is an initiator

A

something that activates the polymerization reaction

28
Q

What are the two different types of polymerization reactions

A

chemical and light

29
Q

What is the wavelength of light necessary to perform a light initiated polymerization

A

460-480 nm (blue light)

30
Q

What is the initiator and activator of a chemically activated system

A
  • Benzoyl peroxide initiator

- Aromatic tertiary amine activator

31
Q

What is the initiator and activator of a light activated system

A
  • Alpha diketone camphorquinone intitiator

- Aliphatic teriary amine activator

32
Q

What is the advantage of aliphatic amines over aromatic amines

A

aliphatic have better color stability

33
Q

Light reactions occurs due to the formation of __

A

free radicals

34
Q

An increase in the thermal expansion coefficient can lead to

A

a greater likely hood of micro leakage

35
Q

What are the three types of resin based on how they are handled

A
  • Flowable
  • Packable
  • Compactable
36
Q

(Compactable/Pactable/Flowable) are no longer available

A

packable

37
Q

Enhanced flowability of the resin leads to an increased risk of __

A

porosities

38
Q

Use alcohol to prevent resin from sticking to the instrument- what happens if too much alcohol is used

A

dilution of resin

39
Q

What is the refractive index of composite

A

1.5 which is similar to tooth structure –> nice esthetics

40
Q

Resins are also classified based on their

A

filler particle size

41
Q

Size of a macrofill resin

A

10-100 um

42
Q

Size of a midfill resin

A

1-10 um

43
Q

Size of a minifill resin

A

0.1-1 um

44
Q

Size of a microfill resin

A

0.01-0.1 im

45
Q

Size of a nanofill resin

A

0.05-0.01 um

46
Q

Size of a hybrid resin

A

mixture of different sized particles

47
Q

Most common resin compositite is ….

A

nanohybrids (nanofill + hybrid)

48
Q

What were the issues with macrofilmed (traditional) resin

A

Pronouced plastic deformation , micro leakage, H2O sorption, surface staining, etc. These particles were too big and allowed access to the matrix

49
Q

What are the pros and cons of microfilmed resins

A
  • Highly polishable- great esthetics for Class V

- Low strength and higher water sorption

50
Q

Why are hybrid composites beneficial

A

because having different particle sizes allows for the highest levels of filler loading

51
Q

Which polishes better microfilm or hybrid

A

microfill

52
Q

Which is stronger microfill or hybrid

A

hybrid (good for posterior regions)

53
Q

Micro-hybrid or nanofilled resin combines the advantages of __ and __

A

microfilled and hybrid resin

54
Q

Packable resins have a (high/low) viscosity

A

high

55
Q

Packable resin can survive (more/less) wear than amalgam

A

more

56
Q

Advantages of packable resin

A
  • Can be placed in bulk
  • Can be carved
  • Less polymerization contraction
  • High dept of cure
57
Q

Disadvantages of packable resin

A
  • Marginal adaptation= more difficult
  • Harder to polish
  • High surface roughness
58
Q

(T/F) Flowable composite is more elastic and flexes with the tooth

A

t

59
Q

Flowable composite is recommendend for…

A
  • Small class V
  • Sleaants
  • Liner under C factor prep
60
Q

Any light cure with a wavelength range of __ can be used

A

400-500nm

61
Q

How well a composite is polymerized depends on what factors

A
  • Wavelength og LCU
  • Intensity of light
  • Exposure time
  • Distance from tip to composite
  • Shade of resin

Direct/Cariology (20 decks)

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