Acrylic Materials Flashcards

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1
Q

Name properties that acrylic should have

A
  • Dimensionally stable/accurate
  • High young modulus- rigid
  • Should have similar thermal expansion coefficient to the artificial teeth
  • Low density (especially for upper)
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2
Q

describe the acrylic polymerisation reaction

A

1) Acrylic monomers
2) Polymerisation initiated by Benzoyl Peroxide when 72*C is reached
3) Polymer propagates and get larger
4) Polymerisation terminates

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3
Q

Name powder components of Acrylic

A
  • Benzoyl Peroxide initiator
  • Pre polymerised PMMA beads
  • Plasticiser (inc. solubility)
  • Co-Polymers- (improve mechanical properties)
  • Pigments for colouring
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4
Q

Name liquid components of Acrylic

A
  • Liquid monomer
  • Hydroquinone inhibitor
  • Co-polymers
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5
Q

Problems with curing acrylic

A

under cured - low molecular weight, high monomer content is an irritant

overcured- gaseous porosity = voids, polymerisation shrinkage up to 20%

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