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F16: Dental Materials > Composites And Glass Ionomers > Flashcards

Composites And Glass Ionomers Flashcards

1
Q

What are the main two components of composites?

A

Organic resin

Inorganic filler

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2
Q

What is the function of the resin?

A

Helps processing and handling. Allows for direct processing

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3
Q

What is the function of the filler?

A

Gives modulus and wear resistance

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4
Q

What are the pros and cons of the resin?

A

Pros: tough and good for processing

Cons: Poor wear resistance

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5
Q

What are the pros and cons of the filler?

A

Pros: Wear resistant and strong

Cons: Brittle and poor processing

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6
Q

How does cross-linking make polymer stronger?

A

Connects multiple polymer chains creating a stronger one unit matrix rather than several individual chains.

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7
Q

What are the pros and cons of more and more cross-linking?

A

Pros: becomes stronger

Cons: shrinkage

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8
Q

_________ leads to polymerization, while _________ leads to the cross-linking of polymers.

A

Methylmethacrylate;

Dimethacrylate

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9
Q

T/F: Smaller filler size leads to better wear properties, better polishing, and better mechanical properties.

A

TRUE

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10
Q

_______ _______ bind the filler to the resin matrix.

A

Coupling agents

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11
Q

What causes shrinkage?

A

Density change during curing. Can lead to stress on tooth.

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12
Q

What is a glass-ionomer cement and how is it cured?

A

Contains acidic polymer and basic glass.

Cured by acid-base reaction

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13
Q

What is one of the major benefits of glass-ionomer adhesive?

A

Releases fluoride

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14
Q

Glass-ionomers are _______ based restoratives.

A

water

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15
Q

Do you need a coupling agent with glass-ionomers?

A

No

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16
Q

What is the major difference between sealant and composite resin?

A

No filler in sealant

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17
Q

What can interfere with polymerization on the thin top layer of resins?

A

Oxygen

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18
Q

How are sealants bonded?

A

Mechanical retention through microtags and macrotags

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19
Q

What is the most important aspect of adhesives?

A

Contain both hydrophilic and hydrophobic qualities.

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20
Q

Are adhesives filled?

A

They are unfilled or lightly filled

21
Q

T/F: Etch is used to remove smear layer from dentin before restoring.

A

True

22
Q

________ are used to bind restorations of appliances to tooth structure.

A

Cements

23
Q

Cements have low ________ but good _________ properties.

A

Viscosity; mechanical

24
Q

For cement mixtures, more powder equals more _______, which leads to a higher _______.

A

Filler; viscosity

25
Q

What types of cements are used in orthodontics?

A

Resin based cements.

26
Q

________ are used to protect dentin from the restoration. Often used in deep restorations.

A

Liners

27
Q

What liner is used in pulp capping?

A

Calcium hydroxide

28
Q

What is the function of ZOE liners?

A

Reduce pain.

Cannot use under composite

29
Q

_______ are used to provide thermal protection for the pulp and mechanical support for the restoration.

A

Bases

30
Q

______ ________ is an example of a base.

A

Glass ionomer

31
Q

What governs the properties of different waxes?

A

Molecular weight

32
Q

What are the two major classes of impression materials?

A

Hydrocolloid - water based (alginates & agar-agar)

Elastomers - hydrophobic (polysolfides)

33
Q

What are the ideal properties of impression material?

A
  1. Low cost
  2. Long shelf life
  3. Biocompatible
  4. Pleasant to patient
  5. Dimensionally stable
  6. Good handling properties
34
Q

T/F: Alginates are used for crown and bridge impressions?

A

False. Not accurate enough.

35
Q

What happens during alginate setting up reaction?

A

Calcium cross links are made after the retarder allows for enough working time.

36
Q

Advantages and disadvantages of water based alginate?

A

Pros: easy to work with in mouth

Cons: shrinking and expanding

37
Q

Polysiloxanes are _________ impression materials.

A

Hydrophobic

38
Q

T/F: Polysiloxanes have a much higher dimensional stability than alginate.

A

True

39
Q

What role do surfactants play in polysiloxanes?

A

They give them more hydrophilic properties

40
Q

Gypsum is cured with what?

A

water

41
Q

Explain the dehydration and rehydration of gypsum.

A

Dehydrated to become powder -> mix with water -> rehydrated to become workable

42
Q

What gives gypsum its strength?

A

Interlocking of gypsum crystals.

43
Q

T/F: Dental plaster is used for models.

A

FALSE.

Dental STONE

44
Q

T/F: Denture base is normally visible light cured.

A

True

45
Q

T/F: Provisionals are usually chemically cured.

A

True

46
Q

What is a major difference between TRIAD and trim/jet?

A

TRIAD = polymethyl methacrylate

Trim/jet = polyethyl methacrylate

47
Q

T/F: Mouthguards use a thermoset polymer.

A

FALSE.

Thermoplastic

48
Q

Properties of mouth guard materials are controlled by a __________.

A

copolymer

F16: Dental Materials (5 decks)

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