By Ö.H. Andersson (Eds.)
The chapters of this ebook characterize the lawsuits of the seventh assembly within the annual foreign Symposium on Ceramics in drugs, held in Turku, Finland, in July 1994. This convention attracted a multidisciplinary viewers from the bioceramics neighborhood, together with top educational and commercial scientists, brands and regulators. the amount contains sixty nine articles
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Extra resources for Bioceramics. Proceedings of the 7th International Symposium on Ceramics in Medicine
Optimisation of the weight ratio addition of emulsion to HA has further enhanced the properties of the EC material. This was confirmed by the measured green and sintered densities, and the respective percentage open porosities, which are given in Table 1 together with the mean biaxial fracture strength, of, sample standard deviation, S and the Weibull modulus, m in Table 1. 3%. By comparison, the calculated sintering shrinkages give sintered densities of 78% TD and 96% TD for the CP and EC materials, respectively.
The frit was ball milled for one hour and then mechanically separated through stainless steel sieves to produce the following particle size ranges: 710-500 //m, 710-90 /vm and 90-38 /vm. After sieving the powders were analyzed using a Coulter model LS100 particle size analyzer to 56 Bioceramics Volume 7 determine the actual particle size distributions. To determine the surface area of each powder size range nitrogen or krypton adsorption was used. A dynamic in vitro test model was used to evaluate the bioactivity of each particle size range as a function of changes in SA/V.
7 μηι. However, whilst this is a substantial reduction in particle size, agglomerates of up to 20 μνη in size are still present. These agglomerates persist through the subsequent ceramic powder processing stages to produce large inherent pores and flaws. Improvements in the mechanical properties of HA will be achieved only if control over the quality and nature of the HA powder particle precursors is obtained. An emulsion conditioning (EC) stage was developed in order to prevent the formation of hard agglomerates .