The study investigates the influence of the applied manufacturing processes on the behaviour of the HAp filler particles in the composites. The nanoparticles show a strong tendency to agglomerate, while the whiskershaped microparticles exhibit good dispersion within the PBS-DLS matrix. In addition, the processing methods do not significantly affect the size of the nanoparticles, but they do have a destructive effect on the whiskershaped particles, reducing their aspect ratio from about 4 to less than 3 in the composites tested.