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Unusual crystal morphologies (picture) are exhibited by fluoroapatite and hydroxyapatite when they are precipitated inside a porous polyglycolide matrix. Crystals are formed first inside the pores and later push the polymer matrix aside to form well-defined aggregates. Such composites of a bioresorbable polymer and hydroxyapatite are promising biomaterials, for example for bone replacement.
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Schwarz et al. (1998) studied this question.
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