Glass ionomer cement

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Glass ionomer cement in dental application

Glass ionomer cement (GIC) is a dental restorative material used in dentistry for filling teeth and luting cements. It is made from a combination of silicate glass powder and polyacrylic acid. Glass ionomer cements are known for their ability to release fluoride, which can help in remineralizing tooth structure and preventing caries.

Composition

Glass ionomer cements are composed of a calcium or strontium alumino-fluoro-silicate glass powder and an aqueous solution of polyacrylic acid. The setting reaction involves an acid-base reaction between the glass powder and the polyacrylic acid, resulting in a hard, water-insoluble material.

Properties

Glass ionomer cements have several advantageous properties:

• Fluoride Release: They release fluoride ions over time, which can help in the prevention of dental caries.
• Biocompatibility: GICs are generally well-tolerated by the surrounding tissues.
• Adhesion: They chemically bond to both enamel and dentin, providing a good seal and reducing microleakage.
• Thermal Expansion: Their coefficient of thermal expansion is similar to that of natural tooth structure, reducing the risk of cracking.

Applications

Glass ionomer cements are used in various dental applications, including:

• Restorative Dentistry: For filling cavities, especially in non-load bearing areas.
• Luting Cements: For cementing crowns, bridges, and orthodontic appliances.
• Base or Liner: Under composite restorations to protect the pulp.
• Fissure Sealants: To prevent caries in pits and fissures of teeth.

Advantages and Disadvantages

Advantages

• Fluoride Release: Provides an anti-cariogenic effect.
• Chemical Bonding: Bonds to tooth structure without the need for a separate bonding agent.
• Biocompatibility: Generally well-tolerated by the pulp and surrounding tissues.

Disadvantages

• Aesthetic Limitations: Less aesthetic compared to composite resins.
• Mechanical Properties: Lower strength and wear resistance compared to other restorative materials.
• Moisture Sensitivity: Sensitive to moisture during the initial setting phase.

Related Pages

• Dental composite
• Dental amalgam
• Fluoride therapy
• Restorative dentistry