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Even though a lot of research has been carried out concerning the preparation of carbonate apatite (CHA), they were related to CHA in the form of powder. In the present study, macroporous CHA bone substitutes were prepared through composition-transformation of gypsum and Ca-hydroxide. Here, we investigated the effect of added Ca-hydroxide to gypsum, carbonation periods, and hydrothermal temperatures for phosphatization to understand the basic principle of composition-transformation of gypsumdoi:10.4236/eng.2010.25045 fatcat:tplogsqbyfh5hprxiqho4vgfhu