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Figure 4. XPS high-resolution spectra of each composite. (A) High-resolution spectra of P2p in the ß-TCP/collagen composite; the secondary peak indicates NH+-phosphate binding. High-resolution spectra of Ca2p (B) and N1s (C) in both composites. The energy positions of N1s and Ca2p in the ß-TCP/collagen composite (1) were significantly higher (p < 0.01) than those in the hydroxyapatite/collagen composite (2). Average binding energies are expressed as the mean ± standard deviation (SD) of 6 specimens (n = 6), and significant differences in each spectrum between composites were analyzed statistically by Student’s t test (p < 0.01).
