Papers by Keyword: Bone Reconstruction

Abstract: Along decades, bioceramics have been used as materials for bone reconstruction, where hydroxyapatite is one of the most used bioceramics. But hydroxyapatite mechanical strength is not so high when compared with another bioceramics. This research aimed to characterize hydroxyapatite-titanium oxide scaffolds with different compositions. Samples were made using a polyurethane sponge with compositions of 70%-30% wt., 60%-40% wt. and 50%-50% wt. of hydroxyapatite-titanium oxide, calcined at 550°C for burning the polymeric sponge and sintered at 1250°C, 1300°C and 1350°C. Samples were characterized by scanning electron microscopy (SEM), x-ray diffraction (XRD) and energy dispersive x-ray spectroscopy (EDS). Results showed that all compositions maintained the polymeric sponge pores structure without any residual traces of the polymeric sponge. Those results are in accordance with technical literature and it is indicated to do in vitro essays to study the scaffolds biocompatibility for using as bone reconstruction materials.

Abstract: The feasibility of calcium carbonate-based cements involving the re-crystallization of metastable calcium carbonate varieties has been demonstrated. Two cement compositions were obtained by mixing either calcium carbonate phases (cement A) or a calcium carbonate and a calcium phosphate phase (cement B) with an aqueous media. These cements set and hardened after 30 minutes and 90 minutes respectively. The final composition of cement A was calcite and aragonite whereas cement B lead to a carbonated apatite analogous to bone mineral. Despite poor mechanical properties the presence of a high carbonate content in the final phase might be of interest to increase the cement resorption rate and to favour its replacement by bone tissue. First assays of implantation performed on fresh anatomical pieces (fresh cadavers) at 37°C revealed important advantages of such cement compositions: easiness of use, rapid setting, good adhesion to bone, very good homogeneity and stability of the cement.