Abstract
The present contribution discusses critical aspects of the thermal alteration that HAp particles undergo when passing along the extremely hot plasma jet. This heat treatment leads to dehydroxylated phases such as oxyhydroxylapatite/oxyapatite as well as thermal decomposition products such as tri- and tetracalcium phosphates, and quenched phases in the form of amorphous calcium phosphate (ACP) of variable composition. The contribution also includes studying the influence bioinert TiO2 bond coats have on adhesion, crystallinity, and composition of HAp coatings. Moreover, the question is being addressed whether oxyapatite might exist as a (meta)stable phase or whether its occurrence is merely an ephemeral event. In addition, the article deals with the role that HAp coatings are playing during in vitro interaction with simulated body fluid (SBF) resembling the composition of extracellular fluid (ECF). The biological and biomechanical advantages of using HAp coatings for medical implants as well as salient aspects of their biomineralization and osseointegration will be discussed in some detail.
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