Structural features of some calcium phosphates of biological interest are described. Structure of hydroxyapatite (OHAp), considered as the prototype for the inorganic component of bones and teeth is discussed with respect to the kinds and locations of ionic substitutions. Octacalcium phosphate (OCP), is a probable precursor in biological mineralization. OCP has a layer type structure, with one ...

Introduction Intra-articular basic calcium phosphate (BCP) (hydroxyapatite, octacalcium phosphate, tricalcium phosphate) crystal-deposition disease is associated clinically with severe degenerative arthritis characterized by hyperplasia of the synovial lining and loss of intrasynovial collagenous structures [1]. The interaction of the crystals with inflammatory cells is believed to be a key fac...

Hydroxyapatite (HAp) is a major component of bones and teeth. HAp widely used to repair, fill, extend, reconstruct damaged bone tissue. for dental implants, so it necessary synthesize HAp. synthesis can utilize green mussel shell waste as calcium precursor. This research synthesized from using the sol-gel method. The controlled parameter was pH, variable being compared heating temperature at 90...