[3].

(A) Flexural strength, and (B) elastic modulus, of dental resin composite containing CaF₂ nanoparticles. At the top, NCF denotes nanoparticles of CaF₂, and WHI denotes whiskers. The x-axis denotes the corresponding CaF₂/(CaF₂ + whisker) mass ratio, where “0” means all whiskers and no CaF₂. Each value is the mean of six measurements with the error bar showing one standard deviation (mean ± sd; n = 6).