Glass Ionomer Cements Overview
24 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is a characteristic of zinc reinforced glass ionomer cement compared to RMGIC and HVGIC?

  • No fluoride release
  • Higher mechanical properties
  • Lower mechanical properties (correct)
  • Lower fluoride release

    • Which component is added to polyacid modified composite resin (Compomer)?

  • Glass particles (correct)
  • Metal ions
  • Zirconia
  • Water

    • What distinguishes nano-ionomer from regular RMGIC?

  • Lower strength
  • No silica components
  • Zirconia/silica nanofillers are added (correct)
  • Higher fluoride release

    • What is the benefit of coating glass ionomer restorations?

    <p>Prevent early water sensitivity</p> Signup and view all the answers

    Which of the following is a characteristic of Zirconomer?

    <p>Shows better mechanical properties due to zirconia particles</p> Signup and view all the answers

    What type of curing method is used for polyacid modified composite resin?

    <p>Light curing</p> Signup and view all the answers

    What common feature do both G-coat plus and Easy Glaze share?

    <p>They offer enhanced surface mechanical properties</p> Signup and view all the answers

    What is a limitation of polyacid modified composite resin (Compomer) compared to traditional composite resin?

    <p>Lower fluoride release</p> Signup and view all the answers

    What is a notable feature of metal modified glass ionomer cement (Cermet)?

    <p>Increase in mechanical properties</p> Signup and view all the answers

    Which material is a resin modified glass ionomer cement (RMGIC) derived from?

    <p>Conventional GIC with hydrophilic resin monomer</p> Signup and view all the answers

    What distinguishes highly viscous glass ionomer cement from conventional GIC?

    <p>More cross-linking in the matrix</p> Signup and view all the answers

    How does zinc reinforced glass ionomer cement enhance its properties?

    <p>Through rapid release of divalent zinc ions</p> Signup and view all the answers

    What is the primary characteristic of Type I Glass Ionomer Cement?

    <p>Low powder-to-liquid ratio and rapid set</p> Signup and view all the answers

    What is a characteristic of resin modified glass ionomer cement in comparison to conventional GIC?

    <p>Less moisture sensitivity</p> Signup and view all the answers

    Which of the following is NOT an advantage of Glass Ionomer Cement?

    <p>High mechanical properties</p> Signup and view all the answers

    What distinguishes Type II b Glass Ionomer Cement from Type II a?

    <p>Reinforced with good mechanical properties and early resistance to moisture</p> Signup and view all the answers

    Which paste-paste formula feature is common to some cement brands?

    <p>Delivers cement with a mixing tip</p> Signup and view all the answers

    How are water settable cements prepared?

    <p>By freeze-drying the liquid and mixing with water</p> Signup and view all the answers

    What is a disadvantage of resin modified glass ionomer cement compared to conventional GIC?

    <p>Less fluoride release</p> Signup and view all the answers

    Which Type II Glass Ionomer Cement is designed for esthetic restoration?

    <p>Type II a</p> Signup and view all the answers

    Which type of cement is characterized by a paste-paste formula that dispenses a specific ratio for mixing?

    <p>Packable glass ionomer</p> Signup and view all the answers

    What is a common modification of Glass Ionomer Cement in its supply form?

    <p>Paste-paste formula</p> Signup and view all the answers

    Why is it important to protect Type II a Glass Ionomer Cement from moisture in the first 24 hours?

    <p>It prevents premature disintegration of the cement</p> Signup and view all the answers

    Which of the following commercial brands corresponds to Type III Glass Ionomer Cement?

    <p>Vitrebond</p> Signup and view all the answers

    Study Notes

    Glass Ionomer Cements (GICs)

    • GICs are acid-base cements.
    • Supplied as a powder and liquid mixture.
    • Used for restorations and cementing restorations.

    Classification of GICs (According to Use)

    • Type I: Luting: Used to cement crowns, bridges, and orthodontic brackets.
      • Characterized by low powder-to-liquid ratio (P/L), thin film thickness, and rapid set.
      • Commercial brands include Ketac Cem (3M ESPE, Meron (VOCO), Riva luting (SDI), Medicem (Promedica).
    • Type IIa: Esthetic Restoration: Used for aesthetic restorations.
      • Characterized by high P/L and good aesthetics.
      • Requires coating within 24 hours to protect from moisture.
      • Commercial brands include Ketac Fil (3M ESPE), Riva Self Cure (SDI), and Medifil (Promedica).
    • Type IIb: Reinforced Restoration: Used for reinforced restorations.
      • Characterized by high P/L and good mechanical properties.
      • Has early resistance to moisture contamination.
    • Type III: Lining or Base: Used as a liner or base.
      • Characterized by low P/L for lining and high P/L for base.
      • Commercial brands include Vitrebond (3M ESPE), Composeal & Medibond (Promedica), and Fuji lining LC (GC).

    Advantages of GICs

    • Chemical bond: Bonds to tooth structure.
    • Fluoride release: Releases and recharges fluoride, making it anti-cariogenic.
    • Biocompatibility: Acceptable biocompatibility.
    • Aesthetics: Good aesthetic appearance.
    • Dimensional stability: Good dimensional stability (shows 3% contraction if properly manipulated).

    Disadvantages of GICs

    • Low mechanical properties: Lower mechanical strength compared to other restorative materials.
    • Water sensitivity: Water sensitivity, especially within the first 24 hours of mixing.

    Modifications of GICs

    • Mode of supply:
      • Capsule: Loaded with correct powder-liquid ratio (P/L) and mixing time to maximize restoration properties. Dispensing through a gun allows better adaptibility.
      • Water settable cement: The acid (polyacrylic acid) is freeze-dried and added to the powder of the GIC. The mixing liquid is pure water or an aqueous solution with tartaric acid. This formula has an extended working time.
      • Paste-paste formula: Supplied in a dual-tube clicker dispenser. Some brands use a spatula, while others use a mixing tip for dispensing. Commercial brands with paste-paste formulas are available.
    • Composition:
      • Metal modified: Reinforcement of glass ionomer cement through sintering with a precious metal (e.g., silver) to the powder of GIC. Improved mechanical properties, but reduced aesthetics, fluoride release, and adhesion. Used in posterior pediatric molars and as a core material.
      • Resin modified: Addition of hydrophilic resin monomer (e.g., HEMA) to conventional GIC. Involves acid-base and polymerization reactions (chemical, light, or dual-cured methods). Improved mechanical properties, reduced water sensitivity, faster working time, and improved aesthetics.
      • Highly viscous (packable): Similar to conventional GIC but with reduced alkali ions in exchange for trivalent ions. Leads to increased crosslinking of the glass ionomer matrix resulting in enhanced properties.
      • Zinc reinforced: Conventional GIC with added zinc to the glass particles. Zinc rapidly releases into the matrix, leading to better cross-linking properties. Lower mechanical properties than RMGIC and HVGIC, but with higher fluoride release.
      • Polyacid modified composite resin (Compomer): Modification of composite resin with glass ionomer component as filler. Light-cured composite material. Releases less fluoride than glass ionomer, has no tooth adhesion, and lower mechanical properties than composite resin (but higher than GIC).
      • Nano-ionomer: Modification of RMGIC with zirconia/silica nanofillers and nanoclusters. Shows comparable properties to RMGIC.
      • Zirconomer (White Amalgam): Made by incorporating zirconia particles with conventional glass ionomer. Shows improved mechanical properties due to transformation toughening of zirconia particles. Available in opaque and translucent forms (improved form with additional nano-zirconia particles).
    • Modifications of Coating:
      • Coating is needed due to early water sensitivity.
      • Water is the reaction medium.
      • Loss/absorption of water weakens the matrix, so coating is essential.
      • Multiple coating materials are available (e.g., cocoa butter, bonding agents, varnishes, and nanofilled coatings).
      • Commercial examples include Fuji coat LC, final varnish LC (VOCO), and Copal varnish (Promedica).

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Glass Ionomer Cement Definitions & Classification PDF

    Description

    This quiz covers the various types and classifications of Glass Ionomer Cements (GICs), focusing on their specific uses and characteristics. Learn about Type I, IIa, IIb, and III GICs, their applications in dental restorations, and the importance of powder-to-liquid ratios. Test your knowledge on this essential dental material.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser