Fluoride release from glass ionomer cements and resin composites coated with a dentin adhesive.
OBJECTIVE
This laboratory study compared the effect of surface coatings on patterns and amounts of fluoride released from four glass ionomer cements and two fluoride-containing resin composites.


METHODS
Twelve cylinders of each material were prepared in a polyethylene mold. The experimental groups (n = 6) were coated with one layer of an adhesive resin (3M Scotchbond Multipurpose Adhesive), while the control groups (n = 6) remained uncoated. Cumulative fluoride release into deionized water was measured on days 1, 2, 3, 7, 14, 21 and 28 using an ion analyzer. Total fluoride release after 28 days was analyzed for significant differences among materials using one-way ANOVA and Student-Newman-Keuls test (p < 0.05).


RESULTS
The total amounts of fluoride release from the coated samples were found to be significantly less than the uncoated samples for all materials, except Solitaire. The uncoated samples released a total amount of fluoride of between 2.3 and 85.4 ppm, while the coated samples released a total amount of fluoride of between < 0.2 and 24.1 ppm. Similar patterns of fluoride release were found in coated and uncoated samples.


CONCLUSIONS
The results indicated that the application of a dentin adhesive coating did not completely prevent fluoride release from glass ionomer cements and fluoridated resin composites, although the amounts were significantly less. Clinically, it suggests that a continued release of fluoride from glass ionomer cements and fluoridated resin composites is possible after placing a thin layer of resin adhesive. The clinical significance of these findings is not known.
Mazzaoui
S A
SA
School of Dental Sciences, University of Melbourne, 711 Elizabeth Street, Melbourne, Vic 3000, Australia. s.mazzaoui@pgrad.unimelb.edu.au
Burrow
M F
MF
Tyas
M J
MJ
D000704:Analysis of Variance; D002327:Cariostatic Agents / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry; D013223:Statistics as Topic; D013499:Surface Properties; D013997:Time Factors; D014867:Water / Q000737:chemistry
C409382:Ariston pHc; D002327:Cariostatic Agents; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D008689:Methacrylates; C081144:Photac-Fil; D019279:Resin Cements; D012117:Resins, Synthetic; C084018:Scotchbond Multi-Purpose; C113049:Solitaire composite resin; C110713:fuji IX; C110712:ketac-molar; D014867:Water; D005459:Fluorides