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BDS3 CDS Dental Materials Science > Provisional Materials > Flashcards

Provisional Materials Flashcards

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1
Q

What are 4 types of provisional materials used in dentistry ?

A

PMMA.
PEMA.
UDMA.
Bis-acryl composite.

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2
Q

What type of reaction do provisional materials undergo on setting ?

A

Free radical polymerisation.

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3
Q

What is significant about provisional materials structure which allows free radical polymerisation ?

A

C=C allows for cross linking and formation of polymer.
Produces long chain network.

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4
Q

What does free radical polymerisation do to the properties of provisional materials ?

A

Increases strength and increases weight.

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5
Q

What is the initiator used in the free radical polymerisation reaction of provisional materials ?

A

Benzoyl peroxide.

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6
Q

What two types of cure can provisional materials undergo ?

A

Heat cure.
Self cure.

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7
Q

What are self cure provisional materials usually used for ?

A

Chairside single crown or short span bridge formation.

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8
Q

What two provisional materials are self curing ?

A

PEMA and bis-acryl composite.

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9
Q

What form do self curing provisional materials come in ?

A

Two pastes in mixing cartridge.

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10
Q

What provisional material is heat curing ?

A

PMMA.

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11
Q

What form does heat curing provisional materials come in ?

A

Powder and liquid.

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12
Q

What temperature do heat curing provisional materials need to be heated to for setting ?

A

73 degrees.

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13
Q

What can PMMA be used for ?

A

Indirect use for short and long span bridges.

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14
Q

What can PEMA be used for ?

A

Direct use for single crowns.

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15
Q

What can bis-aryl composite be used for ?

A

Direct use for short span bridges.

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16
Q

What are the four stages to PMMA setting reaction ?

A
  1. Activation - initiator to provide free radicals.
  2. Initiation - free radicals break C=C bonds.
  3. Propagation - growth of polymer chain.
  4. Termination - i.e. setting of material.
17
Q

What are the 5 constituents of PMMA powder ?

A

PMMA particles.
Initiator - benzoyl peroxide.
Pigments.
Plasticiser.
Copolymers - improve mechanical properties.

18
Q

What are the 2 constituents of PMMA liquid ?

A

Methylmethacrylate monomer - to dissolve PMMA.
Coploymers - improve mechanical properties.

19
Q

What study was carried out to research exothermic properties of provisional materials ?

A

Zach and Cohen.

20
Q

What did the Zach and Cohen study find ?

A

That degree of temperature increase and time of exposure to temperature increase are contributable to pulpal irritation and necrosis.

21
Q

Zach and Cohen study: what was the effect on the pulp with +2 degrees increase on exothermic setting reaction of PMMA ?

A

No effect.

22
Q

Zach and Cohen study: what was the effect on the pulp with +5.5 degrees increase on exothermic setting reaction of PMMA ?

A

56 days to overcome thermal trauma.
Small % of pulps of smaller teeth became necrosis.

23
Q

Zach and Cohen study: what was the effect on the pulp with +11 degrees increase on exothermic setting reaction of PMMA ?

A

Irreparable damage to the pulp initiating pulpal necrosis.
Maximum exothermic temperature for temporary material to be used.

24
Q

What are important properties of a temporary material ?

A

Temperature produced on setting.
Colour stability.
Compressive strength.
Abrasion resistance.
Surface roughness.
Polymerisation shrinkage.
Mean marginal discrepancy.

25
Q

What is the manufacturer name for PMMA ?

A

Jet.

26
Q

What is the manufacturer name for PEMA ?

A

Trim II.

27
Q

What is the manufacturer name for bis-aryl composite ?

A

Protemp4.

28
Q

What is the manufacturer name for urethane dimethacrylate ?

A

Provipont DC.

29
Q

What monomer is present in Bis-acryl composite ?

A

BisGMA.

30
Q

What is the difference between BisGMA and PMMA ?

A

BisGMA (liquid) monomer contains two reactive methacrylate groups (i.e. 2x C=C) forming 3D polymer network - cross linking agent used in composites and adhesives - better mechanical properties.

PMMA - made by polymerising mono-functional methyl methacrylate monomer (1x C=C) forming linear chain-like polymer - glass substitute due to transparency.

BDS3 CDS Dental Materials Science (5 decks)

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