Dental Glass Ionomer procedure

Glass Ionomer Cement

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Glass ionomer cements are high strength bases used primarily for permanent cement, as a base, and as a Class V filling material. They are supplied as a powder and a liquid, or as a powder that is mixed with water. The liquid is typically polyacrylic acid. The powder is an aluminosilicate glass; in some products, the polyacrylic acid is coated on the powder, in which case the liquid used is water or a dilute solution of tartaric acid in water.

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Moisten the prepared cavity.
Prior to mixing the cement, moisten the area to which the cement will be applied, using a damp cotton pellet.

Mix the cement.
Shake the powder carefully and slowly to make sure that the contents are evenly distributed in the bottle, without introducing too much air into the mixture. Use the accompanying measuring spoon to measure exactly one level scoop of powder and place it on the mixing pad.

Carefully shake the liquid and dispense one drop.

Mix the two by gently folding the powder into the liquid; mixing should take up to 15 seconds.

Apply the cement.
Using a calcium hydroxide applicator, pick up the cement and carefully place it into the prepared cavity, allowing it to flow over the surface. Apply enough cement to achieve a 0.5 mm thickness.

Cure the cement.
Cure for 20 seconds. Check the surface to ensure that setting is complete; there should be no indentations. If necessary cure again.

The total thickness of the cement should be about 0.5 mm; if greater thickness is required, additional cement can be applied and cured in 0.5 mm increments.

The mixed glass ionomer cement can be applied as long as the surface of the mixed cement is shiny; if the surface becomes dull, it should discarded and new cement should be mixed.

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. 1997 Oct;28(10):643-50.

Longevity in glass-ionomer restorations: review of a successful technique

  • PMID: 9477884

Abstract

It is just 20 years since glass-ionomer cements were introduced to the profession as a restorative material capable of an ion exchange adhesion to tooth structure as well as a continuing fluoride release. At the time of presentation there was considerable publicity, but, in retrospect, it is likely that the materials were marketed prematurely, before there had been a great deal of clinical investigation. The clinical short-term results were rather disappointing, particularly in relation to esthetics, because the original version lacked translucency. In the next few years, some manufacturers worked to refine the product and improve the properties and achieved reasonable results. In the early 1980s, it was shown that the main problem with both esthetics and physical properties was the need to maintain a proper water balance in the material during the early setting phase. Once this problem was identified and overcome, it became possible to achieve excellent results, but these have not been reported frequently. This article discusses a method of placement that will lead to acceptable glass-ionomer restorations and shows a series of restorations that are up to 15 years old.

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