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DS1102 > Week 7 - GIC > Flashcards

Week 7 - GIC Flashcards

1
Q

What is the normal composition of GIC

A

Powder
- fluoro-alumino-silicate glass
- Na alumino-silicate glass
- CaF
- Pigments

Liquid
- polyacrylic + maleic or itaconic acid
- tartaric acid
- distilled water

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2
Q

What is the function of tartaric acid in GIC

A
  • Improves working time and reduces setting time
  • leads to improved mechanical properties
  • interacts with the polyacid and glass particles promoting the release of ions like calcium and aluminum
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3
Q

What is the function of Maleic acid and Itaconic acid

A
  • enhances the adhesive properties of the glass ionomer cement by increasing the number of carboxylic and acid groups available for bonding with the tooth surface
  • creates a denser cross linked network with the cement matrix leading to improved compressive, tensile and flexural strength
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4
Q

What is the function of water in GIC

A

to activate the acids - creates an aqueous solution

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5
Q

What is the main process/es in GIC setting

A

Acid Base reaction and crosslinking and gelation

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6
Q

What is the GIC chemical process

A
  1. Mixing - polyacrylic acid dissolves the fluoro-alumino-silicate glass
  2. Acid-base reaction - acid reacts with glass particles releasing Ca, Al, Na, F ions
  3. Cross linking and setting - Ca reacts with polyacrylic chain (gelation) forming a loosely bound gel like network. Ca continue to cross link with the carboxylate groups on the polyacrylic acid forming a matrix that starts to harden
  4. Maturation - after 24h AL gradually reacts with the carboxylate groups, leading to further cross linking and hardening, significantly increasing the strength of the cement
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7
Q

What can GIC bond to

A

dentin and enamel

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8
Q

what does GIC bond to calcium apatite via

A

ionic bonds

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9
Q

What does GIC bond to collagen via

A

hydrogen bonds

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10
Q

What should be used to clean/condition surfaces for GIC

A

10-20% polyacrylic acid (or phosphoric acid by GC)

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11
Q

What is the impact of a GIC being compromised with moisture

A
  • Aluminium ions may leach out due to contact with saliva resulting in poor mechanical strength
  • contamination with saliva, blood and extra moisture will result in poor aesthetics (dull and white), strength and bonding
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12
Q

What happens if you over dry GIC

A

delays the setting reaction

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13
Q

What is a method to prevent moisture in the GIC

A
  • careful isolation
  • application of a protective cover such as varnish, GIC coat or light activated bonding agents for 24h
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14
Q

When can you use GIC

A
  • Class 3, 5
  • Class 1, 2 in deciduous teeth
  • Fissure fillings (minimal class 1)
  • Base/core-build-up
  • Long term temporary restorations
  • ART (atraumatic restorative treatment)
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15
Q

What are advantages of GIC

A
  • Bulk placement
  • Sustained release of fluoride
  • Biocompatible
  • Direct adhesion to enamel and dentine
  • Less stained
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16
Q

What are disadvantages of GIC (8)

A
  • Short working time
  • long setting time
  • Erratic Dispensing - if you change the ratio of liquid and powder it changes the properties drastically - recommended to use capsules instead
  • High solubility
  • Poor aesthetics in comparison to composite - there are not many shades (max 3)
  • Low strength and toughness - don’t use in stress bearing areas (e.g. occlusion)
  • Moisture sensitivity - less moisture sensitive than composite
  • Poor wear resistance
17
Q

What is RMGIC

A

Resin modified GIC
GIC with added resin to it in order to increase the wear resistance and aesthetic and also introducing command setting system.

18
Q

What is the composition of RMGIC

A

Powder

  • Radiopaque fluoroaluminosilicate glass
  • Pigments

Liquid

  • Polyacrylic acid
  • HEMA (hydrophilic resin since water in material)
  • Photoinitiators
  • Water
19
Q

What is the bonding system for RMGIC

A

combined cross linking and hardening in RMGIC

20
Q

What are the positives/properties of RMGIC (8)

A
  • Releases fluoride - but less than normal GIC
  • Adhesive to enamel and dentine - don’t need bonding agent since majority is GIC
  • Bulk placement only in case of Ketac-Cem Plus
  • Biocompatible
  • It can be chemically cured or VLC (light)
  • Immediate finishing
  • Low solubility - in comparison to GIC but higher solubility in comparison to composite
  • Good aesthetics in the case of Fuji II LC
21
Q

When can you use RMGIC

A
  • Class 3, 5
  • Class 1, 2 in deciduous teeth
  • Fissure fillings (minimal class 1)
  • Base/core build up
  • long term temporary restorations
  • crown cementation
  • post core cementation
  • pit and fissure sealant

DS1102 (30 decks)

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