Year 1 Sem 2 Tooth conservation > GIC properties > Flashcards

GIC properties Flashcards

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1
Q

List the properties of GIC

A

Adhesion

Fluoride

Biocompatibility

Solubility

Dimensional change

Fracture resistance and wear

Thermal expansion

Colour and translucency

Radiopacity

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2
Q

Describe the adhesion property of GIC

A

• Chemically bonds to enamel and dentine
The higher the mineral content, the greater the bond. • In the order of strongest to the weakest bond: Enamel, sclerotic dentine, sound dentine, caries affected dentine

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3
Q

Describe the fluoride property of GIC

A
  • The fluoride ions are not a structural component of the matrix thus they leach out
  • Following placement, the initial fluoride release is quite high but declines rapidly during the first week and stabilises to a low but constant level over 2 – 3 months.
  • Glass ionomer has the potential to act as a fluoride reservoir
  • Advantages: remineralisation of surrounding tooth structure, inhibition of plaque formation and possible reduction in the recurrence of caries
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4
Q

Describe the biocompatibility property of GIC

A
  • Gingiva and oral mucosa are very tolerant to glass ionomer
  • Freshly mixed glass ionomer is very acidic with pH of 1.6, although it rises in an hour
  • GIC should not placed directly over exposed pulp.
  • Provided 0.5mm of dentine is between the glass ionomer and the pulp, pulpal reaction is relatively benign
  • In deeper cavities, a spot application of calcium hydroxide should be placed on the deepest spot
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5
Q

Describe the solubility property of GIC

A
  • Solubility of the slow set autocure cements is high if not adequately protected against water contamination
  • The surface of glass ionomer can be damaged in the presence of low pH, so application of acidulated phosphate fluoride solution (pH 3.0) will lead to partial dissolution
  • In conditions such as severe xerostomia, autocure glass ionomer will only last for a year, resin- modified glass ionomer appear to be more resistant to dissolution
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6
Q

Describe the dimensional change property of GIC

A
  • RMGIC contracts approximately 3% by volume on setting
  • Resin-modified glass ionomers show a small initial shrinkage at the time of light activation due to the polymerisation of the resin component
  • Overtime, the set material will take up water and expand to some degree and will negate any setting shrinkage
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7
Q

Describe the fracture resistance and wear property of GIC

A
  • Susceptible to brittle fracture as it lacks rigidity compared with hybrid composite and amalgam
  • Avoid occlusal bearing load and bending
  • Silver cements improves abrasion resistance
  • Limited wear resistance, should not be used in direct contact with opposing teeth
  • Sensitive to acid which can lead to increased erosion and wear
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8
Q

Describe the thermal expansion property of GIC

A

• Glass ionomers are very similar to tooth structure in their thermal behaviour

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9
Q

Describe the colour and translucency property of GIC

A
  • Both autocure and resin-modified provide adequate colour matching and transluency
  • For autocure, translucency will take several days to develop
  • Some resin-modified glass ionomers have been shown to susceptible to darkening with time
  • Titanium Oxide needs to be added to restore to a clinically acceptable colour. Eg. Ketac Ag, Riva Silver
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10
Q

Describe the radiopacity property of GIC

A
  • Radiopacity can be achieved by incorporation of barium (Ba), strontium (Sr) or lanthanum (La)
  • Most glass ionomers are more radiopaque than dentine and enamel
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11
Q

Describe the indication of luting cements, mentioning:

  • Powder to liquid ratio
  • Radiopacity
  • Setting rate
A
  • Used to cement crowns, bridges, inlays and ortho appliances
  • Has tensile strength and abrasion resistance
  • Presence of continuing fluoride release
  • Setting rate: fast
  • Powder to liquid ratio: less than restorative material
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12
Q

Describe the indication of restorative GIC cements, mentioning

  • Radiopacity
  • Setting rate
A
  • Autocure: slow resistance to water uptake and loss
  • Resin- modified: fast set, immediate resistance to water uptake
  • Radiopaque
  • Adhesion through the ion-exchange mechanism = strong and eliminates leakage
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13
Q

Describe the indication of lining cements, mentioning:

  • Powder to liquid ratio
  • Radiopacity
A
  • Used as a thermal barrier in restorations
  • Powder to liquid ratio: less than restorative type
  • Radiopaque: always
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14
Q

Describe the indication of GIC base cements, mentioning:

  • Powder to liquid ratio
  • Radiopacity
  • Setting rate
A
  • Used in combination with composite resin
  • Setting rate: fast set
  • Powder to liquid ratio: 3:1 or greater
  • Always use the strongest available material with highest possible powder content and restore completely
  • Radiopaque: always
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Year 1 Sem 2 Tooth conservation
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