IADR Abstract Archives
Fluoride Release And Recharge From Silorane Based Restorative Material
Objectives: To evaluate and compare the effects of temperature, time interval and storage conditions on the fluoride release and to assess the differences in fluoride re-uptake (after recharge) of silorane based restorative materials
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Methods: Silorane based (FiltekP90) composite and methacrylate based (Z100) composite, were used as test materials (10mm x 2mm) in comparison to GIC to investigate fluoride release and recharge when immersed in distilled water or artificial saliva at temperatures 4°C, 37°C or 55°C. The amount of fluoride release (at 1, 7, 14 and 28 days) and re-release after recharge (with 5000ppm neutral sodium fluoride (NaF) solution for 5minutes at 1, 3 and 7 days for 3 weeks) was studied with the help of fluoride selective ion electrode.
Results: Fluoride release at high temperature (mean value: 4°C: ranging from 0.0011 to 0.8729, 37°C: ranging from 0.0015 to 5.4956 and 55°C: ranging from 0.0004 to 8.6528; one way ANOVA (p value <0.001 & tukeys post hoc, p<0.05, except Z100 and FiltekP90 where p value >0.05) and in artificial saliva (t test value ranging from 9.002 to 17.983, p<0.05). Over time period, day 1 to day 28 (Repeated measures ANOVA and bonferroni test) the release was greater (p<0.05) in Filtek P90 when compared to Z100. The fluoride release was greatest in GIC which did not vary much when compared to Filtek P90 and Z100. Fluoride re-release was greater (p<0.05) in GIC > Z100 = Filtek P90 and it increased with time.
Conclusions: The amount of fluoride release and recharge depends on temperature, time interval and storage condition. These restorative materials can serve as fluoride reservoir and contribute a low fluoride release in oral fluids, thereby preventing initiation of secondary caries and failure of restorations. Also, it may be important in developing regimes for improving the delivery of tropical fluoride products.
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Methods: Silorane based (FiltekP90) composite and methacrylate based (Z100) composite, were used as test materials (10mm x 2mm) in comparison to GIC to investigate fluoride release and recharge when immersed in distilled water or artificial saliva at temperatures 4°C, 37°C or 55°C. The amount of fluoride release (at 1, 7, 14 and 28 days) and re-release after recharge (with 5000ppm neutral sodium fluoride (NaF) solution for 5minutes at 1, 3 and 7 days for 3 weeks) was studied with the help of fluoride selective ion electrode.
Results: Fluoride release at high temperature (mean value: 4°C: ranging from 0.0011 to 0.8729, 37°C: ranging from 0.0015 to 5.4956 and 55°C: ranging from 0.0004 to 8.6528; one way ANOVA (p value <0.001 & tukeys post hoc, p<0.05, except Z100 and FiltekP90 where p value >0.05) and in artificial saliva (t test value ranging from 9.002 to 17.983, p<0.05). Over time period, day 1 to day 28 (Repeated measures ANOVA and bonferroni test) the release was greater (p<0.05) in Filtek P90 when compared to Z100. The fluoride release was greatest in GIC which did not vary much when compared to Filtek P90 and Z100. Fluoride re-release was greater (p<0.05) in GIC > Z100 = Filtek P90 and it increased with time.
Conclusions: The amount of fluoride release and recharge depends on temperature, time interval and storage condition. These restorative materials can serve as fluoride reservoir and contribute a low fluoride release in oral fluids, thereby preventing initiation of secondary caries and failure of restorations. Also, it may be important in developing regimes for improving the delivery of tropical fluoride products.