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The reactivity of acid base cements forming hydroxyapatite (HA) such as, tetracalcium phosphate, and dicalcium phosphate anhydride or dicalcium phosphate dihydrate, is normally adjusted by altering the particle size and hence the specific surface area of the compounds. Amorphous calcium phosphates, prepared by precipitation from supersaturated solutions, can also react to form apatitic cements since...