Abstract

ABSTRACTCalcium phosphate phases such as hydroxyapatite (HAP) and octacalcium phosphate (OCP) have long been considered as model systems for biological minerals. Moreover such phases are involved in ceramic and plasma coated titanium (HPCTI) prosthetic devices. Most of these mineral preparations are mixtures of calcium phosphate phases, as evidenced by X-ray analysis. However, many mineralizing systems involve the formation of metastable intermediates which may subsequently undergo phase transformations. There is therefore considerable interest in investigating the simultaneous growth and dissolution of multiple mineral phases. Based on the Constant Composition (CC) method, the new Dual Constant Composition (DCC) technique has been developed for kinetics studies of the dissolution of the mixed calcium phosphate phases frequently encountered in-ceramic and plasma coated apatite surfaces.

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