Temporary Materials Flashcards Preview

BDS3 Dental Materials Science > Temporary Materials > Flashcards

Flashcards in Temporary Materials Deck (6)
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1
Q

4 examples of temporary materials

A
  1. PMMA - polymethylmethacrylate e.g. jet
  2. PEMA - polyethylmethacrylate e.g. trim II
  3. Bis-acryl composite e.g. protemp 4, quicktemp
  4. UDMA - urethanedimethacrylate e.g. provipont DC
2
Q

how is PMMA formed

A

free addition polymerisation of methacrylate monomer via cross linking due to C=C

3
Q

advantages of PMMA

A

powder / liquid formulation
self curing
good marginal fit
good transverse strength
polishable

4
Q

disadvantages of PMMA

A

poor abrasion resistance
high shrinkage
high thermal release
free monomer may be toxic

5
Q

key properties to consider with temporary materials

A
  1. temperature - exothermic reaction / material encapsulates tooth prep / safety / dentist’s concern
  2. colour stability - aesthetics / anterior teeth / patient’s concern
6
Q

how is the pulp affect by materials

A

affected by temperature rise from exothermic reaction as well as duration of this