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Newly developed Sr-substituted alpha-TCP bone cements.

机译:新开发的Sr取代的α-TCP骨水泥。

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New bone cements made of Sr-substituted brushite-forming alpha-tricalcium phosphate (alpha-TCP) were prepared and characterized in the present work. The quantitative phase analysis and structural refinement of the starting powders and of hardened cements were performed by X-ray powder diffraction and the Rietveld refinement technique. Isothermal calorimetry along with setting time analysis allowed a precise tracing of the setting process of the pastes. The pastes showed exothermic reactions within the first 10-15 min after mixing and further release of heat after about 1h. An apatitic phase formed upon immersion of the hardened cements in simulated body fluid for 15 and 30 days due to the conversion of brushite into apatite confirming their in vitro mineralization capability. The compressive strength of the wet cement specimens decreased with increasing curing time, being higher in the case of Sr-substituted CPC. The results suggest that the newly developed Sr-substituted brushite-forming alpha-TCP cements show promise for uses in orthopaedic and trauma surgery such as in filling bone defects.
机译:制备了由形成Sr取代的透钙磷石的α-磷酸三钙(α-TCP)制成的新型骨水泥,并对其进行了表征。通过X射线粉末衍射和Rietveld细化技术对原料粉末和硬化水泥进行定量相分析和结构细化。等温量热法和凝固时间分析可以精确追踪糊状物的凝固过程。混合后的前10-15分钟内,糊状物显示放热反应,约1小时后进一步放热。硬化水泥在模拟体液中浸泡15天和30天后形成的脂溶相,这是由于透钙磷石转化为磷灰石所致,证实了它们的体外矿化能力。湿水泥样品的抗压强度随固化时间的增加而降低,在Sr取代的CPC的情况下更高。结果表明,新开发的形成Sr取代的透钙磷石的α-TCP水泥显示出有望用于整形外科和创伤外科手术,例如用于填充骨缺损。

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