PMMA (acrylic resin) Flashcards

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1
Q

give some ideal properties of acrylic resin?

A
high softening temp
unaffected by oral fluids
high youngs modulus
thermal expansion math that of tooth
high thermal conductivity
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2
Q

what does the liquid component of PMMA contains?

A
methacrylate monomer (dissolve pmma particles)
inhibitor (hydroquinone)
co-polymer (improve mechanical properties)
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3
Q

what does the powder component of PMMA contain?

A
imitator (benzoyl peroxide)
pmma particles
plasticiser
pigment
co - polmymer
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4
Q

what happens if u heat cure the PMMA above 100 degrees celsius?

A

gasses will be produced leading to porosity and a weaker denture

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5
Q

what effects will under curing have on PMMA denture?

A
free monomer (irritant)
low molecular weight (poor mechanical properties)
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6
Q

too much monomer when making PMMA results in what?

A

contraction porosity

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7
Q

too little monomer when making PMMA results in?

A

granularity

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8
Q

name the 2 types of porosity u might get in acrylic?

A

gaseous porosity or contraction porosity

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9
Q

name the good properties of PMMA

A
non toxic
non irritant
unaffected by oral fluids
thermal expansion = artificial tooth
high thermal conductivity
low density
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