الفهرس | Only 14 pages are availabe for public view |
Abstract This work included the preparation and in-vitro bioactivity studies of glass, ceramic and glass / ceramic composite samples with different compositions using infrared reflection spectroscopy, (IR) and scanning electron microscope, (SEM) techniques. The formation of the hydroxy apatite (HAP) layer, which is the only indication of the bioactive properties of the samples, is detected on the surfaces of the samples after their immersion in the simulated body fluid (SBF) using IR of SEM. Characterization of the prepared bioactive samples through their mechanical properties was also studied.Infrared reflection spectra of bioactive glass, ceramic and glass / ceramic composite surfaces before and after their immersion in the simulated body fluid (SBF) exhibited that there is a relationship between the composition of composite samples and their bioactivities. The infrared reflection spectra were detected using FTIR spectrometer in the wave number range (2000 – 400 cm-1) and showed that all prepared samples have biological behavior with different rates, i.e the ability of samples to form HAP layer on their surfaces is higher in case of composite samples containing highly durable phosphate glass and lower in the case of composite samples containing low – durable silicate glass. The photo-micrographs of the samples surfaces confirm the above results through the formation of granules of HAP layer. The compressive strength measurements indicated that the glass / ceramic composites are qualified to be used as bone replacement for highly – load region in the body.The photo-micrographs of the samples surfaces confirm the above results through the formation of granules of HAP layer. The compressive strength measurements indicated that the glass / ceramic composites are qualified to be used as bone replacement for highly – load region in the body. Glass / ceramic composites containing phosphates glass formed wollastonite, combeite, calcium phosphate, devitrite, and whitlockite phases. While as the composites containing silicate glass formed wollastonite, devitrite, cristobalite, whitlockite and sodium phosphate phases which were responsible for their biological behavior and mechanical properties. |