Compoglass, Vivadent, Schaan, Principality of Liechtenstein; and Xeno, Sankins, Tochigi, Japan) and one resin-modified glass ionomer cement (Fuji I1 LC, GC, Tokyo, Japan). There were four test solutions: one alcoholic (whiskey), two low-pH drinks (Coca-Cola, orange juice), and one deionized water. Over a period of 60 days, the tested specimens were immersed in the test solution for 3 hours every day, then kept in deionized water. The fluoride released was detected by using a fluoride ion selective electrode connected to a microprocessor ion analyzer. The fluoride ion concentration (ppm) of the test solutions and deionized water was recorded after 1 , 2 , 3 , 4 , 7 , 3 0 , and 60 days. Electron probe microanalysis was used for surface analysis of the fluoride released.Resufts: When immersed in low-pH soft drinks, compomer showed a significantly higher fluoride release than when immersed in deionized water ( p c .0001). For specimens immersed in Coca-Cola, the fluoride release levels (pg/cm2, mean 3 SD) at 1,7, and 60 days for Dyract (91.6 i: 1.8,39.3 i: 3.1, 10.5 3 0.9), Compoglass (129.5 0.9, 66.5 3 2.7, 19.0 3 0.3), Fuji I1 LC (147.0 i: 4.2, 50.8 +: 3.1, 27.6 f 3.0), and Xeno (73.6 i: 3.2,27.3 i: 2.1, 6.6 i: 0.6) demonstrated the trend of significantly lower releases with time in water solution. Over a 60-day period, materials immersed in 100% orange juice released the highest amount of fluoride, which could be attributable to the erosive effect of the medium. Materials immersed in deionized water released the least amount of fluoride. Among the tested compomers, Compoglass released the most fluoride.
CLINICAL SIGNIFICANCEThe results of this study indicate that, at low pH, compomer restorative materials tend to release more fluoride. Dent 12:97-104,2000) he demands of patients for the need for an ideal tooth-colored restoration with adequately satisfied properties has increased. Resinmodified glass ionomer cement and compomer recently have been introduced for clinical use. In an oral environment, the behavior of the materials differs. Dissolution of the
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