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Fixed Final > Resin (5) > Flashcards

Resin (5) Flashcards

1
Q

Ideal properties of Provisional Restorative materials

A

Ease of formation
Promotes oral health
Esthetic appearance
Stable and Durable

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2
Q

What are the advantages of Resin-based restorative materials?

A

Relative ease of formation
Some translucency
Thermally and electrically insulating

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3
Q

What are the disadvantages of Resin-based restorative materials?

A 
Exothermic rxn
Polymerization shrinkage
Variable polymerization efficiency
High coefficient of thermal expansion on heating
Low toughness
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4
Q

What happens if the resin polymerization doesn’t go to completion?

A

It will be less durable

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5
Q

What is the formation rxn of resin polymer?

A

Monomer + filler + active initiator = filled polymer

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6
Q

What are the categories of polymers?

A

Thermoplastic

Thermoset

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7
Q

Thermoplastic

A

No cross-linking
Physical state is reversibly controlled by temperature
i.e. wax

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8
Q

Thermoset

A

Transformation form monomer to polymer involves irreversible cross-linking

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9
Q

Monomer

A

Molecule capable of covalent bonding with another monomer

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10
Q

Polymer

A

Molecule formed from many monomers

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11
Q

Co-polymer

A

Polymer formed from two or more monomers

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12
Q

What are the mechanisms of polymerization or setting

A
  • Addition polymerization releases no by-products

- Condensation polymerization results in a by-product

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13
Q

What is the exclusive polymerization method for most current dental restorative resins?

A

Free-radical polymerization

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14
Q

What physical phenomenon occurs during polymerization

A

Changes from a liquid to a solid

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15
Q

What are the chemical stages of polymerization?

A
  • Activation of initiator
  • Activation of monomer
  • Polymer growth
  • Termination
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16
Q

What are the types of initiator activation?

A

Heat activation
Chemical activation
Light activation

17
Q

Heat activation of an initiator

A 
Highly efficient
Uniform
Large working time
Requires mixing of initiator and monomer
Requires heating equipment
18
Q

Chemical activation of initiator

A

Chemical activator is packaged with monomer and mixing is required
Working time is fixed by the chemistry
This is not was efficient heat activation, but heat can increase efficiency

19
Q

Light activation of initiator

A

All ingredients can be mixed by the manufacturer
Working time is practically infinite, but is diminished by ambient blue light
Intense light is required for efficiency - blue light is diminished by tooth colored materials, especially those that are darker

20
Q

Activation of monomer

A

The change of a double bond to two single binds releases the heat of a reaction

21
Q

Growth of active polymer

A

Active polymer spontaneously combines with more monomer
The heat of reaction whats the material
The density increases
Monomers with dual functionality cause cross-linking between two growing polymers

22
Q

The greater the size of the methacrylate monomer…

A
  • the less shrinkage
  • the less heat of the run
  • the lower the mechanical properties of the set resin
23
Q

What are the physical state changes that occur during polymer growth?

A
  1. Liquid/Sandy
  2. Stringy
  3. Doughy
  4. Rubbery
  5. Solid
24
Q

Termination

A

2 active polymers can combine

Free radical transfer causes a growing to stop growing while activating a single monomer

25
Q

What contaminants can cause early termination?

A

Oxygen
Sulfur
Eugenol
Hydroquinone

26
Q

What is the general composition of dental resins?

A

Monomer and the activation system becomes the polymer matrix

Filler particles

27
Q

What are the types of filler

A

Organic

Inorganic

28
Q

Organic filler

A

Soluble in the monomer

29
Q

Inorganic filler

A

Requires a silane bonding agent to chemically bond to the polymer matrix
But it provides better mechanical properties of the set composite

30
Q

How can an ideal material promote oral health?

A

Protect remaining tooth structure
Maintain periodontal health
Provide occlusal stability
Maintain tooth position

31
Q

What are the types of resin?

A

PMMA
PR’MA
Bis-acrylate (Bis-GMA)
Urethane DMA

32
Q

Which resin materials provide the most desirable marginal adaptation during the Indirect Technique?

A 
Duralay (PMMA)
Protemp Garant (Bis-GMA)
33
Q

Which resin materials provide the most desirable rise in temp during reaction?

A 
Protemp Garant (Bis-GMA)
Trim (PR'MA)
34
Q

Which resin materials provide the most desirability of Toxicity and Allergenicity?

A 
Protemp Garant (Bis-GMA)
Triad (Urethane DMA)
35
Q

Which resin materials provide the most fracture toughness?

A

Triad

Jet

36
Q

Which resin materials provide the most desirability of odor?

A

Triad

Protemp Garant

Fixed Final (8 decks)

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