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Figure 3. PO4 and Ca release for the 3 groups of composites. Each value is mean ± SD; n = 4. The nano DCPA:whisker mass ratio was designated as D:W. For each group, two-way ANOVA showed significant effects of D:W and immersion time, with a significant interaction between the 2 parameters (P < 0.05). Increasing the D:W ratio significantly increased the PO4 and Ca concentrations (P < 0.05). At each D:W, increasing the immersion time significantly increased the PO4 and Ca ion concentrations. The hybrid control and inlay/onlay control had no detectable release.
