Microspherical sintered bodies of {HEAD ~ hydroxyapatite} are prepared according to a new specific process wherein a suspension having {TAIL ~ hydroxyapatite microparticles} dispersed in water or an organic solvent or a mixture of water and an organic solvent compatible therewith is atomized into a heating zone maintained above 500° C. whereby spherical agglomerates of hydroxyapatite microparticles formed by drying and solidification of microdroplets of the suspension are sintered while the agglomerates are suspended in the heating zone 
Microspherical sintered bodies of { HEAD ~ hydroxyapatite } are prepared according to a new specific process wherein a suspension having { TAIL ~ hydroxyapatite microparticles } dispersed in water or an organic solvent or a mixture of water and an organic solvent compatible therewith is atomized into a heating zone maintained above 500 ° C. whereby spherical agglomerates of hydroxyapatite microparticles formed by drying and solidification of microdroplets of the suspension are sintered while the agglomerates are suspended in the heating zone
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