GLASS IONOMER CEMENT ADALAH PDF

Glass ionomer cement is a kind of dental cement that was developed in and began to be used in restorative dentistry in Made of a silicate glass powder combined with a water-soluble polymer, these cements are also called "giomers. The cement is popular because it adheres to enamel and dentin and has the same natural color as teeth. In addition, glass ionomer cement releases fluoride ions, which are beneficial to the teeth. However, giomers are brittle and cannot be used in load-bearing areas. As of the s, new formulas with higher powder-to-liquid ratios have been introduced, and these are slightly stronger.

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Glass ionomer cement is a kind of dental cement that was developed in and began to be used in restorative dentistry in Made of a silicate glass powder combined with a water-soluble polymer, these cements are also called "giomers. The cement is popular because it adheres to enamel and dentin and has the same natural color as teeth. In addition, glass ionomer cement releases fluoride ions, which are beneficial to the teeth. However, giomers are brittle and cannot be used in load-bearing areas.

As of the s, new formulas with higher powder-to-liquid ratios have been introduced, and these are slightly stronger. Studies have shown giomers to have 90 percent retention over a year period. For optimal bonding, the tooth surface should be conditioned with polyacrylic acid before application of the cement. Glass ionomer cements are classified based on what they are used for. Type I giomers are used as adhesives for attaching dental crowns, bridges and prostheses.

If traditional giomers are to be used in a higher-stress area of the mouth, they must be protected by an amalgam or a resin composite. This is sometimes called the "sandwich technique" because the giomers are sandwiched between the tooth and whatever restorative material is being used.

A more recent innovation is resin-modified glass ionomer cement, which forms an even stronger bond with dentine than traditional giomers do.

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Glass ionomer cement

A glass ionomer cement GIC is a dental restorative material used in dentistry as a filling material and luting cement , [1] including for orthodontic bracket attachment. Occasionally water is used instead of an acid, [2] altering the properties of the material and its uses. Tartaric acid plays a significant part in controlling the setting characteristics of the material. Non-destructive neutron scattering has evidenced GIC setting reactions to be non-monotonic, with eventual fracture toughness dictated by changing atomic cohesion, fluctuating interfacial configurations and interfacial terahertz THz dynamics. Glass ionomer cement is primarily used in the prevention of dental caries.

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Glass-Ionomer Cements: History and Current Status

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What is glass ionomer cement?

Nicholson Glass polyalkenoate cements, more commonly known as glass-ionomers, are made of calcium or strontium alumino-fluoro-silicate glass powder base combined with a water soluble polymer acid. Glass-ionomers were invented in and reported by Wilson and Kent in the early s. Significant amounts of fluoride ions are released during this reaction. Two variations of true glass-ionomer materials that were developed in the s and s are those modified by inclusion of metal and those with a light-polymerized liquid resin component that renders the cement photocurable as part of the overall hardening reaction. The latter are referred to as resin-modified glass-ionomer cements. The original glass-ionomer commercial formulations introduced in the s failed to gain widespread interest, especially by dentists in North America. Those materials had long setting times, were susceptible to dissolution and desiccation during hardening, and had poor wear resistance and low fracture strengths once set.

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