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Hydroxyapatite was formed by the extremely slow addition of diammonium hydrogenphosphate to a solution of calcium nitrate at pH9 buffered with ethylenediamine at 36.5•Ž. The Ca/P molar ratio in the precipitate yielded was measured by inductively coupled plasma atomic emission spectrometry and the condition of the crystals was examined by X-ray diffraction. This synthetic apatite was compared with human tooth and bones from cattle and pigs. The crystallization condition and Ca/P molar ratio were extremely similar to those of human tooth. INTRODUCTION Calcium hydroxyapatite(HAp) is the main inorganic component of bone and tooth, which are hard tissues in vertebrates. HAp is reoresental by the chemical formula of Ca10(PO4)6(OH)2 .. Therefore, the molar ratio(Ca/P ratio) of calcium to phosphorus in standard HAp is 1.67. In addition, several % of collagen are included as an organic substance in natural HAp samples , and the crystal form is hexagonal 1-3. It is also noted that environmental radiostrontium-90 and cadmium ions are easily incorporated in living bone". Synthesis of HAp has been attempted by based on various conventional methods of not only the crystallinity of HAp 1-3,7-19 but also particle morphology 15-19. Especially, HAp is generally synthesized by the wet synthesis which is considered easier. Because the synthesis temperatures used are approximately the boiling point of water, it is also difficult to carry out experiments involving organism HAp. There are few research reports on the coprecipitation behavior of the ions such as strontium and cadmium during the synthesis HAp. However the authors reviewed the basic knowledge available on the uptake behavior of ions in living HAp to develop methods of generating HAp with a crystallinity and Ca/P ratio of approximately 1.67 using a standard organic temperature(36.5•Ž) in an aqueous solution. This paper describes a detailed examination of methods for forming HAp Received September 7, 2004; Accepted November 15, 2004

THE WET METHOD OF SYNTHESIZING HYDROXYAPATITE FROM AQUEOUS SOLUTIONS AT VARIOUS pH RANGES WHICH MADE ORGANISM TEMPERATURE MAIN