[Volume changes of bone cements].

Abstract

The volume changes of hardening cements are measured with the buoyancy method. During hardening the polymerisation shrinkage runs through distinguished phases, totaling from setting in the bone to the final state 2 to 4 volume percents. Expansion and contraction because of temperature changes superimpose the measurements by a rate of 0, 21%/10 degrees C. - Factors influencing the volume changes are discussed.