Glass Ionomer Cement Flashcards

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1
Q

Name the components of the Polyacid

A

Polyacrylic acid - copolymers of acrylic and itaconate

Tartarate- alters the setting characteristics

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2
Q

Name the components of the powder base

A
Silica 
Alumina
Calcium Fluoride
Sodium Fluoride
Aluminium Fluoride
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3
Q

What increases radiopacity of GIC

A

The inclusion of strontium and lithium salts in the powder base

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4
Q

Recite the setting reaction for GIC

A

MO. + SiO2 + H2A –> MA + SiO2 + H2O

Glass + acid > Salt + Silica gel and water

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5
Q

Discuss Dissolution

A
  • acid into solution
  • H+ ions attack glass surface
  • Ca, Al, Na, F
  • leaves silica gel around unreacted glass
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6
Q

Discuss Gelation

A
  • Initial set is due to Ca2+ ion cross linking w/ polyacid matrix
  • bivalent so can bind to two carboxyl groups
  • chelation can happen
  • formation of calcium polyacrylate
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7
Q

Discuss Hardening

A
  • Aluminium ions cause cross linking
  • trivalent molecule
  • forms aluminium polyacrylate
  • improves mechanical properties
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8
Q

List properties of GIC

A
  • Can bond to tooth w/o use of prime and bond
  • poor bond strength
  • poor tensile strength
  • high solubility compared to other materials
  • usually seals well
  • Fluoride release
  • carboxyl group bond to calcium in enamel
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