ZIRCONIA-CALCIUM PHOSPHATE COMPOSITES FOR BONE-REPLACEMENT

Bioceramic composites utilizing the good mechanical properties of ZrO2 and the biocompatibility of calcium phosphate have been developed. Si ntered samples containing various proportions of yttria-stabilized zir conia and calcium phosphate powders have been produced. Optical and sc anning electron microscopic techniques have been used to characterize the microstructural features. Diametral compression strengths of compo sites have been measured after various treatment times in Ringer's sol ution. The data indicate that the strength and toughness of calcium ph osphates used in clinical applications may be improved through the add ition of zirconia particles. (C) 1997 Elsevier Science Limited and Tec hna S.r.l.