Quartz 4

W3 GIC

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GIC restorations12

Cavity Preparation

Caries removal for a small occlusal cavity restored with auto cure glass ionomer cement

INITIAL LESIONCAVITY PREPARATION
  • peripheral moat #3 round bur into sound dentin
  • affected dentin
  • infected dentin 0.5mm remaining
Note peripheral moat and small amount of slightly stained carious dentin on cavity floor

Principal setting stages during cement maturation.3

graph LR
    subgraph Input Ingredients
        A[Glass powder (base)<ul><li>reactive (ionomer) glass</li><li>lyophilized polycarboxylic acid</li></ul>]
        B[Cement liquid (acid)<ul><li>aqueous polycarboxylic acid</li><li>tartaric acid</li></ul>]
    end

    C[Powder liquid ratio > acid-base reaction]

    D[Liquid state: silica hyrogel forming > water protection (prevents dissolution)]

    E[Solid state: hardened cement > water addition (prevents dehydration)]

    A --> C
    B --> C
    C --> D
    D --> E

    style A fill:#e0f7fa
    style B fill:#e0f7fa
    style C fill:#4fc3f7
    style D fill:#4fc3f7
    style E fill:#4fc3f7

    subgraph Time Stages
        F[Mixing > 45 seconds]
        G[Net setting time - 3 - 6 minutes]
        H[Maturation > 24 hours - 1 year]
    end

    F --> G
    G --> H

    style F fill:#bdbdbd,color:#000000
    style G fill:#bdbdbd,color:#000000
    style H fill:#bdbdbd,color:#000000

Mechanism of GIC adhesion4

  • The mechanism of GIC adhesion to the tooth’s inorganic structure involves a chelation reaction between the carboxyl groups of the polyacrylic acid and the calcium in the hydroxyapatite crystals of the tooth.
  • In completely set cement, fluoride ions are not an essential part of the matrix and are in an unbound form. These ions are released into the saliva by diffusion.

Preparation and Restoration of the Tooth5

  • Cleaning: A pumice slurry should be applied to the tooth surface using a prophy cup.
  • Conditioning of tooth: after rinsing and drying the tooth, 10% polyacrylic acid is applied for 10 seconds to increase the surface energy and wettability of the tooth, which improves chemical bonding.
  • Placement of restoration: the mixed GIC is carried to the cavity with the help of a cement carrier and adapted using a condenser. Cement sticking to the spatula should be avoided as it is difficult to remove.
  • Protection of the cement: the setting cement should be covered by a matrix band during the initial setting and by varnish, cocoa butter, or vaseline after the initial set because GIC is moisture sensitive during the first 24 hours of setting.
  • Finishing and polishing: initial finishing includes the removal of gross excess with a sharp hand instrument. Final finishing is done after 24 hours.

Clinical Applications678

Cervical re-restorations9

Abrasions with recession10

Root caries11

Cervical Caries

Footnotes

  1. Original PDF page 1: W3 GIC, p.1 ↩

  2. Original PDF page 2: W3 GIC, p.2 ↩

  3. Original PDF page 3: W3 GIC, p.3 ↩

  4. Original PDF page 4: W3 GIC, p.4 ↩

  5. Original PDF page 5: W3 GIC, p.5 ↩

  6. Original PDF page 6: W3 GIC, p.6 ↩

  7. Original PDF page 7: W3 GIC, p.7 ↩

  8. Original PDF page 8: W3 GIC, p.8 ↩

  9. Original PDF page 9: W3 GIC, p.9 ↩

  10. Original PDF page 10: W3 GIC, p.10 ↩

  11. Original PDF page 11: W3 GIC, p.11 ↩

Graph View

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