In this paper is presented a comparative study regarding the synthesis of hydroxyapatite powders. The chosen method of synthesis of this biomaterial was chemical co-precipitation. The structure, size and morphology of the obtained powders were analyzed by X-ray diffraction, infrared spectroscopy - FTIR, dynamic light diffusion DLS tehnique and scanning electron microscopy-SEM. The results obtained were compared with those obtained on a commercial hydroxyapatite powder. Investigation methods have confirmed the synthesis of a high purity hydroxyapatite with a optimal degree of crystallization and crystallinity for the reconstruction and regeneration of hard tissue.
 D. F. William - The William Dictionary of Biomaterials, Liverpool, 1999.
 L. L. Hench - Ceramics, Glasses, and Glass-Ceramics în Biomaterials Science, An Introduction to Materials in Medicine; Ed. Academic Press, p. 73-84, 2004.
 L. L. Hench, J. Wilson - Bioceramics, Materials Research Society Bulletin p. 62-74, 1991.
 J. B. Park, R. S. Lakes - Biomaterials - An Introduction, Second Edition, Plenum Press, New York, 1992.
 L. L. Hench - Bioactive Ceramics, in Bioceramics: Material Characteristics vs In Vivo Behaviour, Vol.523, p. 54, Ed. P. Ducheyne and J. Lemons, 1998.
 M. J. Freeman, D. E. McCullum, P. K. Bajpai - Use of ALCAP ceramics for rebuilding maxillo-facial defects, Trans. Soc. Biomat, 4, p.109, 1981.
 P. K. Bajpai, C. M. Fuchs, M. Strnat - Development of alumino-calcium phosphorous oxide (ALCAP) ceramic cements în: Biomedical Engineering IV - Recent Developments. Proceedings of the Fourth Southern Biomedical Engineering Conference, Jackson, MS, Ed. B Sauer, Pergamon Press, New York p. 22-25, 1985.
 W. Höland, W. Vogel, K. Naumann, J. Gummel - Interface reactions between machinable bioactive glassceramics and bone, Journal of Biomedical Materials Research,19, p. 303-312, 1985.
 R. Z. Le Geros - Apatites in Biological Systems, Progress in Crystal Growth and Characterization of Materials, 4, p.1-45, 1981.
 R. Z. Le Geros - Calcium Phosphate in Oral Biology and Medicine, Monographs in Oral Science, 15, Ed. HM Myers, S. Karger, Basel, 1991
 N Angelescu., D.N., Ungureanu F.V. Anghelina , Synthesis and characterization of hydroxyapatite obtained in different experimental conditions, The Scientific Bulletin of VALAHIA University - MATERIALS and MECHANICS, 6(9), 15-18, 2011
 D.N. Ungureanu N. Angelescu, V. Tsakiris, V. Marinescu, Investigations regarding chemical synthesis of calcium hydroxyapatite, Romanian Journal of Materials, 42(1), 52 - 60, 2012.