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![[5]](https://www.ncbi.nlm.nih.gov/core/lw/2.0/html/tileshop_pmc/tileshop_pmc_inline.html?title=Click%20on%20image%20to%20zoom&p=PMC3&id=2605014_nihms71434f5.jpg)
Rate of fluoride release per hour per specimen surface area (µg/h·cm2) from nanocomposite containing mass fractions of 25% whiskers, 20% CaF2 and 20% DCPA. Each value is mean ± sd; n = 3. The initial release rate was nearly 2 µg/(h·cm2). It decreased to 0.50 µg/(h·cm2) after 500 hours, and 0.29 µg/(h·cm2) after 1680 hours (10 weeks).
