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BDS3 DMS > Temporary Materials > Flashcards

Temporary Materials Flashcards

1
Q

What are the three common types of temporary materials?

A
  1. PMMA
  2. PEMA
  3. Bis-acryl composite
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2
Q

What component do all temporary materials have in common?

A

resin

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3
Q

What is the brand name for temporary PMMA?

A

Jet

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4
Q

What are brand names for temporary PEMA?

A

Trim II
Snap

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5
Q

What are brand names for temporary bis-acryl composite?

A

Protemp4
Quicktemp

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6
Q

What is the brand name for temporary UDMA

A

Provipont DC

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7
Q

What are the beneficial properties of PMMA (e.g. Jet)

A
  • powder/liquid formulation
  • self-curing
  • good marginal fat
  • good transverse strength
  • polishable
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8
Q

What are the negative properties of PMMA (e.g jet)

A
  • poor abrasion resistance
  • high shrinkage
  • high thermal release
  • free monomer may be toxic
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9
Q

Describe the molecular structure of PMMA

A
  • methacrylate monomer
  • monofunctional monomer (one C=C bond)
  • linear chain-like polymer formed
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10
Q

Describe the molecular structure of bis-acryl composite

A
  • bis-GMA monomer
  • bifunctional (2 C=C bonds)
  • 3D polymer network formed
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11
Q

What are the key properties of a temporary material to assess?

A
  • temperature reached during setting
  • compressive strength
  • colour stability
  • abrasion resistance
  • polymerisation shrinkage
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12
Q

Why must be temperature during setting be considered for temporary materials?

A
  • setting is an exothermic reaction
  • temperature reached is a safety consideration
  • too great an increase in temperature can harm the pulp
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13
Q

Why is colour stability considered for temporary materials

A
  • aesthetics, especially anteriorly
  • patient will be concerned about this
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14
Q

Briefly outline the Zach & Cohen (1965) study

A
  • animal study
  • soldering iron used to apply heat to a tooth
  • did not consider length of application
  • found an 11 degree increase resulted in irreparable pulp necrosis
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15
Q

Briefly outline the Tjan (1989) study

A
  • in vitro study
  • measured temperature rise in the pulp chamber during the fabrication of provisional resin crowns
  • suggested amount of heat transferred may be sufficient to cause thermal damage to the dental pulp
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16
Q

Briefly outline the Baldissara (1997) study

A
  • pair of teeth used
  • one exposed to thermal stimulus and monitored then extracted to examine histological changes
  • other extracted and exposed to the same thermal stimulus
  • peak temperature higher than than involved in temporary material setting
  • increase of 11 degrees does not damage the pulp
17
Q

What does colour stability refer to?

A
  • the resistance of a material to staining
  • even temporary materials must be in the mouth for months in some cases
18
Q

What is used to measure colour change and what is it measured in?

A

a colorimeter is used to measure the discolouration and it is measured as Delta E

19
Q

Why is polymerisation shrinkage to be considered for temporary materials?

A
  • assessing the accuracy of fit
  • low polymerisation shrinkage provides a good clinical fit
  • mean marginal discrepancy can be used to measure shrinkage
20
Q

Why is compressive strength important to consider for temporary materials?

A

materials must be able to withstand biting forces (<700N)

21
Q

Why is abrasion resistance important to consider for temporary materials?

A

although the materials do not need to be as strong as those used for permanent restorations they still must resist abrasion

22
Q

What factors must be considered when selecting a temporary material?

A
  • ease of use
  • working time
  • setting time
23
Q

What crowns/bridges can PMMA be used for?

A
  • short bridges
  • long bridges
24
Q

What crowns/bridges can PEMA be used for?

A
  • single crowns
25
Q

What crowns/bridges can bis-acryl composite be used for?

A
  • short span bridges

BDS3 DMS (10 decks)

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