| 1806 Time-dependent Fluoride Uptake Into Dentin From a Resin-modified Glass Ionomer | ||
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C.I. MCLAREN1, J.B. DENNISON1, P. YAMAN1, B.H. CLARKSON1, and W.C. WAGNER2, 1University of Michigan, Ann Arbor, USA, 2University of Detroit Mercy, MI, USA Objectives: The objective of this study was to use electron microprobe analysis to measure the amount of fluoride uptake and the depth of penetration into dentin from a resin-modified glass ionomer at different time intervals after restoration placement. Methods: Twenty intact human molars were prepared and Class V restorations placed using either Valiant Ph.D. (control) or Fuji II LC. Specimens were randomly distributed into groups of 5, matured in 100% humidity for either 1, 15, or 30 days, and mounted and sectioned thereafter. A linear analysis of the dentin fluoride concentration and penetration depth from the axial wall of each specimen was performed using a WDX electron microprobe. Data was evaluated using a 1-way ANOVA at each 2mm distance increment from the tooth-restorative interface. Results: For specimens restored with Fuji II LC, an average interfacial fluoride level of 3,800ppm was seen after 1 day of maturation, dropping below the detection limit within the first 10mm. Specimens matured for 15 and 30 days demonstrated interfacial fluoride levels of around 5,600ppm, with measurable fluoride penetration reaching up to 20-30mm into dentin. No significant differences were found between the controls and 1 day-matured specimens. For the 15 and 30 day-matured specimens, there was significantly more fluoride detected within the first 12-16mm compared to controls. Few disparities in dentin fluoride content were found between the 15 and 30 day-matured specimens. There were no significant differences among any of the specimen groups noted beyond a depth of 24mm. Conclusion: Electron microprobe analysis demonstrated significant concentrations and penetration of fluoride in dentin, released from a resin-modified glass ionomer restoration after 30 days of in vitro maturation. Further studies are needed to show the long-term fluoride diffusion in dentin and correlate specific concentrations of fluoride with the ability to resist demineralization or recurrent decay. | ||
| Seq #203 - Ceramics and Cements: Clinical and Biological Evaluation 10:15 AM-11:30 AM, Friday, 12 March 2004 Hawaii Convention Center Exhibit Hall 1-2 | ||
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