“…Biphasic deposits, in which particles of one type of CaPO 4 were embedded into a continuous coating of another type of CaPO 4 , could be prepared as well(Fig. 17)[420]. In order to improve the bond strength between the deposits and substrates, an intervening layer of another compound might be applied prior the sol-gel Since biomimetics (synonyms: bionics, biomimicry) seeks to apply biological methods and systems found in nature, biomimetic deposition appears to be a method whereby a biologically active bone-like apatite deposits are formed on substrates by immersion in various simulating solutions, such as Hank's balanced salt solution (HBSS), PBS or SBF[37, 39, 51, 56, 68-71, 324, 327, 431-443].…”