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Effects of Cobalt on Physical and Mechanical Properties and In Vitro Degradation Behavior of Brushite Cement

机译：钴对黑矾水泥体外力学性能及体外降解行为的影响

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摘要

Cobalt (Co), a vital element in biological functions, induces osteogenesis and angiogenesis at low concentrations. We present the effects of Co and its concentration on the setting time, compressive strength, and degradation behavior of brushite cement (BrC), a potential candidate to fill small bone defects. Addition of Co at up to 1wt.% decreased the compressive strength in a dose-dependent manner to 1.09 +/- 0.21MPa. The initial setting time decreased in samples with 0.25wt.% Co from 3.67 +/- 0.23 min to 2.21 +/- 0.04min, then increased to 6.80 +/- 0.08min with addition of 1wt.% cobalt, while a similar trend was found for the final setting time. The stable pH of the buffer during degradation along with phase analysis showing presence of only tricalcium phosphate and dicalcium phosphate dihydrate suggest that the disintegration of the cement is not accompanied by any noticeable chemical reaction. These data show that, although Co significantly affects the setting time and compressive strength, it does not play a critical role in the degradation behavior of BrC.
机译：钴（Co），生物功能中的重要元素，在低浓度下诱导骨发生和血管生成。我们介绍了CO及其浓度对黑泥（BRC）的凝固时间，抗压强度和降解行为的影响，填充小骨缺损的潜在候选者。加入高达1wt的CO.％以剂量依赖性方式降低压缩强度至1.09 +/- 0.21MPa。在0.25wt的样品中初始设定时间减少。％Co从3.67 +/- 0.23分钟到2.21 +/- 0.04min，然后增加到6.80 +/- 0.08min，加入1wt。％钴，而类似的趋势找到了最终的设置。在降解期间缓冲液的稳定pH共同显示仅存在磷酸钙和磷酸二钙二水合物的存在表明水泥的崩解不伴随着任何明显的化学反应。这些数据表明，尽管CO显着影响了设定时间和压缩强度，但它不会在BRC的降解行为中发挥关键作用。

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