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- W754731694 abstract "Calcium phosphate cements (CPCs) are a family of self-setting, bone repair materials. CPCs possess excellent biocompatibility, surgical handiness and adequate mechanical properties but reveal slow resorption in vivo. Currently, very interesting group of CPCs are biomaterials composed of α-tricalcium phosphate (α-TCP, α-Ca3(PO4)2) and calcium sulfate. Calcium sulfate hemihydrate (CSH, CaSO4·0.5 H2O) posses a long clinical history in different fields of medicine and is widely recognized as a safe, fast setting and resorbable implant material. The main goal of this study was to investigate how different factors influence the phase composition and physico- chemical properties of the new, cement-type material on the basis of α-TCP, CSH and anhydrous dicalcium phosphate (DCP, CaHPO4). In presented work two different powder phase compositions and three liquid phases were used to produce new bone substitutes. XRD results showed that obtained materials, after setting and hardening, consisted of α-TCP, DCP, DCPD (CaHPO4·2H2O), HA and bassanite phases. Initial (I) and final (F) setting times of the cement pastes were determined with Gillmore needles and differed in the range of 4-14 min (I) and 10-30 min (F). Increase in the amount of CSH in the powder com- ponent resulted in shortening of setting time. Micro- structure of cements was evaluated on the fractured samples by scanning electron microscopy (SEM) and the porosity via mercury porosimetry. Open porosity of the final materials was similar for all investigated compositions. Compressive strength depended on the composition and increased steadily over a period of maturation. The results obtained suggest that calcium phosphate/sulfate bone cement has the potential to be applied for bone augmentation. abstract Every day human bones undergo different injuries resulting from public transport accidents, diseases or trauma. Consequently, they cause temporary or constant patients disability or even death. Fractures happen not only to elderly people suffering from osteoporosis, but also more and more frequently to young people, who got some injuries as a result of life style, e.g. doing sports. The desire to enhance the physical well being and quality of patients' life, who got some injury causes constant development of medical devices for ostheosynthesis. In the case of complicated fractures, in which plaster treatment is not sufficient, surgical treatment and applying implant are indispensable. The aim of the article is to present two case stu- dies on intramedullary nails. The first one concerns a method of ostheosynthesis for a patient, who was injured in an accident. The second one presents the failure of the implanted intramedullary nail. The rese- arch included evaluation of the type of fracture and the analysis of microstructure, chemical composition and hardness of the implant materials." @default.
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- W754731694 date "2012-01-01" @default.
- W754731694 modified "2023-10-03" @default.
- W754731694 title "Characterization of the novel calcium phosphate/sulfate based bone cements" @default.
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