【摘 要】
：
Bioactive bone cements based on a paste-paste system for orthopaedic applications were developed consisting of hydroxyapatite ( HA ) filler particles in a metha
【机 构】
：
Department of Biomaterials
论文部分内容阅读
Bioactive bone cements based on a paste-paste system for orthopaedic applications were developed consisting of hydroxyapatite ( HA ) filler particles in a methacrylate matrix comprising urethane dimethacrylate(UDMA) and triethylene glycol dimethacrylate ( TEGDMA ). To improve the interface between inorganic filler and orgaric matrix the HA particles were subjected to two different surface treatment methods, using polyacrylic acid ( PAA ) and γ- methacryloxy propyl trimethoxy silane (γMPS). The aim of the present study was to determine the influence of surface treatment and the inclusion of multifunctional methacrylates on the mechanical properties,namely 3-point flexural strength (FS) and fracture toughness of the cements and the effect of ageing in simulated body fluid. Comparing the mechanical properties of the two cements, the γMPS-HA cement showed that the fracture toughness of the experimental bone cements were significantly greater (p＜ 0.001) compared to that of the PMMA cement, whereas PAA-HA containing cement had strength values around 20% lower. Interestingly, PAA was found to be more effective in improving the interface as the PAA treated HA cement ( UTHAPPA ) maintained its strength on immersion in SBF , suggesting that PAA provided a coupling, which was less sensitive to moisture,a similar trend was also observed with the inclusion of the carboxyl containing multifunctional methacrylates.
其他文献
Three kinds of titanium surface especially the HA surface are analyzed. Titanium was treated by 3 kinds of methods that were acid & alkali, calcic solution and
Ordered nanostructure arrays of Ni-Al2O3 were synthesized by direct current electro-deposition in anodic alumina membranes (AAM). The investigation with an elec
The characteristics of broken surfaces were researched by a scanning electron microscope (SEM) and a reflection microscope, and the fractal dimensions of broken
Coastal structures may be built on natural sedimentary intermediate grounds, which mainly consist of silty soils and fine sandy soils. In this study, extensive
SmxGdyCe1-x-yO2-δ (x+y=0.2 and x=0, 0.04, 0.08, 0.12, 0.16, 0.2) nanopowders were prepared by a coprecipitation method. The zeta potential and sedimentation vo
Thin film of biodegradable calcium phosphate coated on threaded commercially pure titanium (cp-Ti) dental implants has been investigated as one of alternatives
This study examined the biological response of two porous calcium phosphate ceramics,hydroxyapatite (HA) and hydroxyapaptite/ β-tricalcium phosphate ( HA / β-
There is a great demand for in-situ real-time chemical sensors in the oceanographic research, to measure the chemical components under the deep sea. The ISE (Io
An integrated metallurgical model was developed to predict microstructure evolution and mechanical properties of iow-carbon steel plates produced by TMCP. The m
The hydroxyapatite/polylactide biocomposites were prepared by absorption process in liquid phase. The method avoided many disadvantages, such as interfusion of