CLINICAL-PERFORMANCE OF GLASS-IONOMERS

Glass-ionomers were introduced to the profession 20 years ago and have been shown to be a very useful adjunct to restorative dentistry. Thei r major advantages include the ion exchange adhesion to both enamel an d dentine and a continuing fluoride release throughout the life of the restoration. The chemistry of the setting reaction is essentially an acid/base reaction but recent research has introduced variations in an effort to improve clinical handling. Small additions of resin increas e the physical properties to a degree and allow for a light-initiated setting mechanism. However, it is essential that the acid/base reactio n remains dominant if the full advantages of the grass-ionomer are to be retained. The material has multiple uses in dentistry and it shows a high degree of biocompatibility to the pulp and surrounding soft tis sues. The main limitation at this time is a relatively low fracture re sistance but it is possible to protect it through lamination with stro nger materials if the need arises. This paper examines the essential p arameters for successful clinical placement and comments on its longev ity. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.