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首页> 外文期刊>Acta biomaterialia >Zinc-based glass polyalkenoate cements with improved setting times and mechanical properties.
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Zinc-based glass polyalkenoate cements with improved setting times and mechanical properties.

机译：具有改善的凝固时间和机械性能的锌基玻璃聚烯酸酯水泥。

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摘要

The suitability of glass polyalkenoate cements (GPCs) for skeletal applications is limited by the presence, in the glass phase, of the aluminium ion (Al3+), a neurotoxin. The zinc ion (Zn2+), a bacteriocide, has been incorporated into aluminium-free GPCs based on zinc silicate glasses. However, these GPCs have considerably shorter working times and poorer mechanical properties than their Al3+-containing counterparts. Based on results for calcium phosphate cements, there is an indication that mixing a GPC with an organic compound, tricalcium citrate (TSC), may lead to cements with improved rheological and mechanical properties. We developed a range of Zn-based GPCs and determined their working times (Tw), setting times (Ts), compressive strength (CS) and biaxial flexural strengths (BFS). A GPC composed of 1g of a calcium-zinc silicate glass (BT100) mixed with a 50wt.% aqueous solution on polyacrylic acid (coded E9, Mw 80,800) at a powder liquid ratio of 2:1.5 exhibited the best combination of Tw, Ts, CSand BFS. We also found that the addition of TSC (over the range 5-15wt.%) to a GPC led to significant increases in both Tw (from 40+/-3 to 100+/-4s) and Ts (from 70+/-2 to 3000+/-4s) accompanied by changes in both CS and BFS that were affected by the duration of the aging time of the specimens in distilled water (for example, after aging for 7 days CS dropped from 62+/-2 to 17+/-1MPa, while after aging for 30 days, BFS increased 27+/-6 to 31+/-7MPa and then dropped to 17+/-1MPa). Future modification and characterization of the examined GPCs are needed before they may be considered as candidates for orthopaedic applications.
机译：玻璃聚链烯酸酯水泥（GPC）在骨骼应用中的适用性受到玻璃相中神经毒素铝离子（Al3 +）的限制。锌离子（Zn2 +）是一种杀菌剂，已被掺入基于硅酸锌玻璃的无铝GPC中。但是，这些GPC与含Al3 +的同类产品相比，工作时间短得多且机械性能较差。根据磷酸钙水泥的结果，有迹象表明，将GPC与有机化合物柠檬酸三钙（TSC）混合可以使水泥的流变性和机械性能得到改善。我们开发了一系列基于Zn的GPC，并确定了它们的工作时间（Tw），凝固时间（Ts），抗压强度（CS）和双轴弯曲强度（BFS）。由1g钙锌硅酸盐玻璃（BT100）与50％。％的聚丙烯酸溶液（编码为E9，Mw 80,800）混合而成的粉末粉末比为2：1.5的GPC表现出Tw，Ts的最佳组合，CSand BFS。我们还发现，向GPC中添加TSC（范围为5-15wt。％）会导致Tw（从40 +/- 3到100 +/- 4s）和Ts（从70 +/- 2到3000 +/- 4s）伴随着CS和BFS的变化，这些变化都受试样在蒸馏水中老化时间的影响（例如，老化7天后CS的值从62 +/- 2降至17 +/- 1MPa，在老化30天后，BFS增加27 +/- 6至31 +/- 7MPa，然后降至17 +/- 1MPa。在将被检查的GPC视为骨科应用的候选者之前，需要对其进行进一步的修改和表征。

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