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glass ionomer cements		A polymer obtained by reacting polyacrylic acid with a special anion-leachable glass (alumino-silicate). The resulting cement is more durable and tougher than others in that the materials comprising the polymer backbone do not leach out. [ Articles | Books | Images | Discussion groups ]
Additional comments : Glass Ionomer cements are used in modern dentistry for various preventive purposes, one of which is the treatment of cervical caries lesions. Anticariogenic properties and the ability to bond to dentin and enamel are their main advantages. Liberman R, Eli I, Imber S, Shlezinger I.  Clin Prev Dent. 1990 Apr-May;12(1):5-8. Glass ionomer cements are popular today because they satisfy many of the characteristics of an ideal cement. They can be mixed easily by hand or triturator. They bond to teeth moderately, have optimum flow properties allowing easy seating, are cariostatic and are relatively inexpensive Christensen GJ. J Am Dent Assoc. 1994 Sep;125(9):1257-8. Glass ionomer cements are currently used in endodontic therapy for sealing root canals (orthogradely and retrogradely), for sealing and restoring the pulp chamber, for repairing perforations and root resorption defects, and, rarely, for treating vertically fractured teeth. The successful use of these cements is the result of their particular characteristics: a chemical bond to dentin, which enhances the seal of the root canal and the reinforcement of the tooth; a good biocompatibility in the periradicular area and a fluoride release without loss of strength of the material. De Moor R, De Bruyne M.  Rev Belge Med Dent. 2000;55(4):345-51. In general, glass ionomer cements are classified into three main categories: conventional,metal-reinforced and resin-modified. Conventional glass ionomer cements were first introduced in 1972 by Wilson and Kent. They are derived from aqueous polyalkenoicacid such as polyacrylic acid and a glass component that is usually a fluoroaluminosilicate. When the powder and liquid are mixedtogether, an acid-base reaction occurs. As the metallicpolyalkenoate salt begins to precipitate, gelation begins and proceeds until the cement sets hard. S Cho, AC Cheng - J Can Dent Assoc, 1999

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