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MINERVA ORTOPEDICA E TRAUMATOLOGICA
A Journal on Orthopedics and Traumatology
Minerva Ortopedica e Traumatologica 2000 December;51(6):321-6
Process planning on the microstructure of porous composites (biological cements)-ad to produce bone substitute compounds in orthopaedic bone-repair
Albanese L., Beruto D., Capurro M., Mezzasalma S., Botter R., Cirillo P., Schiappacasse S.
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Background. In the present paper addition of Tricalcium Phospate (alfa-TCP) powders as an aqueous dispersion to a Polymethylmethacrylate (PMMA) bone cement is shown to produce a class of composites which, due to their microstructure and mechanical properties, may be suitable for application as bone substitutes.
Methods. The PMMA forms a cellular solid matrix, with open cells of about 100 µm and incorporating TCP clusters. The TCP aggregates inside the cells form a porous network with average mesopore diameters of about 0.1 mm, which is accessible from the outer surface. If TCP is added to PMMA in the form of dried powders the composites are not applicable as bone substitutes.
Results. The dynamic elastic modulus (DEM) measured and discussed for both classes of composites.
Conclusions. The mechanical properties of the bone substitute composites, although lower than the other class of composites, are yet competitive with those properties of a porous ceramic matrix of hydroxyapatite and with those of natural bones.