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KMID : 0362219940210020175
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Journal of The Korean Research Society for Dental Materials
1994 Volume.21 No. 2 p.175 ~ p.184
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FLUORIDE REI, EASE FROM RESTORATIVE GLASS-IONOMERS INTO DE-IONIZED WATER AND ARTIFLCIAL SALIVA
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Abstract
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The purpose of this study was to compare the amount and pattern of fluoride release from restorative cements into de-ionized water with that in artificial saliva. There light-curing glass ionomers 1. 2. 3, a water-setting glass ionomer4, two
conventional glass ionomers5. 6 and a resin-based material 7 were selected. Sixteen cylindrical samples (6.5mm x 2.5mm) of each cement wee prepared. Each was individually suspended in 5ml of either de-ionized water or artificial saliva (eight
samples in
each medium) and stored at 37℃. the media wee changed and fluoride concentration was measured with fluoride electrode for 90 days. the data showed that : (1) Cumulative fluoride release from ketc-Fil, Dyract and VariGlass VLC into the artificial
saliva
was significantly less than in de-ionized water (p<0.05) as tested by ANOVa. The cumulative amounts of fluoride into the saliva were 2.52, 0.10, and 0.65 mgF-/㎤. And they accounts for 49%, 14% and 84% of the amounts into de-ionized water
respectively ;
(2) Ketac-Fil released more fluoride than other materials in both media (p<0.001). vitremer, Iono Gem, and Dyract released 37%, 38%, and 13% of the cumulative amount of fluoride from Ketac-Fil into deionized water, respectively, but they released
73%,
78% and 4% of that into artificial saliva, respectively. It is concluded that the release of fluoride from some restorative glass ionomers is highly variable according to the medium in which glass ionomer is stored, and so artificial saliva
should
be
used to test fluoride release of restorative glass ionomer cements.
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