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🧍 > Composite > Flashcards

Composite Flashcards

1
Q

Used for cervically eroded areas

A

GIC

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2
Q

Used for direct aesthetic restorations

A

Composite

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3
Q

Better aesthetic than GIC

A

GIC modified resin

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4
Q

Composite have fluoride release

A

False

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5
Q

Composers are less aesthetically pleasing and have more wear resistance and fluoride release

A

False

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6
Q

Compomere less aesthetically pleasing and have more wear resistance and fluoride release

A

False

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7
Q

Composite are recommend for classes

A

3,4,5,1

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8
Q

Composite can be classified as

A

Flowable, packable, laboratory, mircofilled, nanofilled

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9
Q

What are composite made of?

A

Resin, filler particles, silane coupling agent

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10
Q

Fine particles
Microfine
Nanofiller sizes

A

0.2 to 3
0.04
1 to 10

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11
Q

What are microhybrid composites?

A

Microhybrid composites are made by combining fine and microfine fillers. They contain up to 84% filler by weight and 70% by volume, resulting in stronger and more durable properties.

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12
Q

Why do microhybrid composites have high filler content?

A

Microfine fillers fit into the spaces between fine fillers, increasing the total filler concentration to improve strength and performance.

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13
Q

What are microfilled composites?

A

Microfilled composites contain only microfine fillers, with 35% to 50% filler by volume, making the material smoother and easier to handle.

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14
Q

Which composite is stronger: microhybrid or microfilled?

A

Microhybrid composites are stronger because they have a higher filler content compared to microfilled composites.

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15
Q

What are the common materials used as fine fillers?

A

• Quartz
• Lithium aluminum silicate
• Barium glass
• Strontium glass
• Zinc glass
• Ytterbium glass

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16
Q

Which fine fillers are radiopaque?

A

Fine fillers containing barium, strontium, zinc, or ytterbium are radiopaque, making them visible on X-rays

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17
Q

Which fine fillers are not radiopaque?

A

Quartz and lithium aluminum silicate are not radiopaque.

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18
Q

What is the purpose of a coupling agent in composites?

A

The coupling agent creates a strong bond between the inorganic filler particles and the organic resin matrix.

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19
Q

What is the most commonly used coupling agent?

A

Silane

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20
Q

What type of compound is silane?

A

Silane is a bifunctional silicon-organic compound that links inorganic fillers to the organic resin matrix.

21
Q

Why is the coupling agent important?

A

Without a coupling agent, the fillers and resin wouldn’t bond well, reducing the composite’s strength and durability.

22
Q

What system is commonly used for polymerizing composites?

A

The visible light-curing system, which uses blue light to start the polymerization process.

23
Q

How does the visible light-curing system work?

A

• Blue light is absorbed by a diketone.
• The diketone reacts with an organic amine, starting polymerization.
• It takes 20–40 seconds of exposure to fully set the composite.

24
Q

Why doesn’t polymerization occur before blue light exposure in light-curing systems?

A

The reaction only starts when the blue light activates the diketone, keeping the composite stable until then.

25
Q

What is the self-curing system?

A

A system that uses:
• An organic peroxide initiator
• An organic amine accelerator
The two chemicals are mixed to start the polymerization process.

26
Q

How long does light-curing take?

A

Polymerization with blue light usually takes 20–40 seconds.

27
Q

What is the wavelength of the light used for curing composites?

A

470 nm, which is blue light visible to the human eye.

28
Q

What are the common light sources used for curing composites?

A

Back:
1. Halogen lights
2. Plasma arc lights
3. Argon lasers
4. Blue light-emitting diodes (LEDS)

29
Q

Which type of composite shrinks less during polymerization, microhybrid or microfilled?

A

Microhybrid composites shrink less because they have less resin compared to microfilled composites.

30
Q

Why can polymerization shrinkage cause issues with bonding?

A

Shrinkage can create stress that exceeds the bond strength between the composite and the tooth, leading to marginal leakage (gaps between the composite and the tooth).

31
Q

What are two techniques to reduce the effects of polymerization shrinkage?

A
  1. Layering technique: Polymerize the composite in layers to reduce shrinkage.
    1. Indirect method: Create a composite inlay in a lab and bond it with low-viscosity resin cement to reduce shrinkage stress.
32
Q

What is thermal conductivity?

A

Thermal conductivity is the ability of a material to transfer heat.

33
Q

How does the thermal conductivity of composites compare to metals?

A

Composites have much lower thermal conductivity than metals and are similar to the conductivity of enamel and dentin.

34
Q

Why is the low thermal conductivity of composites beneficial?

A

It provides thermal insulation for the dental pulp, protecting it from sudden temperature changes.

35
Q

What is thermal expansion?

A

Thermal expansion refers to how much a material changes in size when it heats up or cools down.

36
Q

Which composites have higher thermal expansion: microfilled or microhybrid?

A

Microfilled composites have higher thermal expansion because they have more resin.

37
Q

How does water sorption affect microfilled composites?

A

Back: Microfilled composites absorb more water, which can lead to discoloration from water-soluble stains.

38
Q

Are microhybrid composites radiopaque?

A

Yes, most microhybrid composites are radiopaque, meaning they show up on X-rays.

39
Q

Which type of composite has higher compressive strength: microhybrid or microfilled?

A

Microhybrid composites have higher compressive strength than microfilled composites.

40
Q

does filler affect the compressive strength of composites?

A

Composites with more filler have higher strength because the filler helps resist forces better.

41
Q

Which composite is better for Class V restorations: microhybrid or microfilled?

A

Microfilled composites are better for Class V restorations because their lower stiffness reduces stress on the bond between the composite and dentin.

42
Q

What factors affect the depth of cure?

A

The depth of cure depends on the time of light exposure, the composite product, the shade of the composite, and the curing light.

43
Q

Why is the depth of cure important?

A

If the composite near the pulp isn’t fully cured, it can cause pulpal irritation or postoperative sensitivity.

44
Q

How can you ensure proper curing of composite near the pulp?

A

Composite should be placed in thin layers to ensure full curing.

45
Q

What is incremental addition?

A

Incremental addition is the technique of placing composite in layers to ensure proper polymerization and minimize shrinkage.

46
Q

Why is incremental addition important?

A

Incremental addition ensures the composite shrinks less and is properly polymerized.

47
Q

Why is air inhibition helpful in composite placement?

A

Air inhibition helps each layer chemically bond to the previous layer, improving the restoration’s strength.

48
Q

What happens to C═C bonds during composite setting?

A

Not all C═C (carbon-carbon) bonds react; about 50% remain unreacted.

49
Q

Why is the presence of unreacted C═C bonds useful?

A

The unreacted C═C bonds allow the composite surface to be cleaned and repaired later by adding new material.

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