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Direct/Cariology > Restorative Resin Based Composite Materials > Flashcards

Restorative Resin Based Composite Materials Flashcards

(61 cards)

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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
Other than adhesion of filler particles to the matrix, what is another purpose of coupling agents
-provide hydrolytic stability meaning it is more resistant to H2O penetration
26
The Organic matrix is (weak/strong) and the filler is (weak/strong)
weak...strong
27
What is an initiator
something that activates the polymerization reaction
28
What are the two different types of polymerization reactions
chemical and light
29
What is the wavelength of light necessary to perform a light initiated polymerization
460-480 nm (blue light)
30
What is the initiator and activator of a chemically activated system
- Benzoyl peroxide initiator | - Aromatic tertiary amine activator
31
What is the initiator and activator of a light activated system
- Alpha diketone camphorquinone intitiator | - Aliphatic teriary amine activator
32
What is the advantage of aliphatic amines over aromatic amines
aliphatic have better color stability
33
Light reactions occurs due to the formation of __
free radicals
34
An increase in the thermal expansion coefficient can lead to
a greater likely hood of micro leakage
35
What are the three types of resin based on how they are handled
- Flowable - Packable - Compactable
36
(Compactable/Pactable/Flowable) are no longer available
packable
37
Enhanced flowability of the resin leads to an increased risk of __
porosities
38
Use alcohol to prevent resin from sticking to the instrument- what happens if too much alcohol is used
dilution of resin
39
What is the refractive index of composite
1.5 which is similar to tooth structure --> nice esthetics
40
Resins are also classified based on their
filler particle size
41
Size of a macrofill resin
10-100 um
42
Size of a midfill resin
1-10 um
43
Size of a minifill resin
0.1-1 um
44
Size of a microfill resin
0.01-0.1 im
45
Size of a nanofill resin
0.05-0.01 um
46
Size of a hybrid resin
mixture of different sized particles
47
Most common resin compositite is ....
nanohybrids (nanofill + hybrid)
48
What were the issues with macrofilmed (traditional) resin
Pronouced plastic deformation , micro leakage, H2O sorption, surface staining, etc. These particles were too big and allowed access to the matrix
49
What are the pros and cons of microfilmed resins
- Highly polishable- great esthetics for Class V | - Low strength and higher water sorption
50
Why are hybrid composites beneficial
because having different particle sizes allows for the highest levels of filler loading
51
Which polishes better microfilm or hybrid
microfill
52
Which is stronger microfill or hybrid
hybrid (good for posterior regions)
53
Micro-hybrid or nanofilled resin combines the advantages of __ and __
microfilled and hybrid resin
54
Packable resins have a (high/low) viscosity
high
55
Packable resin can survive (more/less) wear than amalgam
more
56
Advantages of packable resin
- Can be placed in bulk - Can be carved - Less polymerization contraction - High dept of cure
57
Disadvantages of packable resin
- Marginal adaptation= more difficult - Harder to polish - High surface roughness
58
(T/F) Flowable composite is more elastic and flexes with the tooth
t
59
Flowable composite is recommendend for...
- Small class V - Sleaants - Liner under C factor prep
60
Any light cure with a wavelength range of __ can be used
400-500nm
61
How well a composite is polymerized depends on what factors
- Wavelength og LCU - Intensity of light - Exposure time - Distance from tip to composite - Shade of resin

Direct/Cariology (20 decks)

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