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首页> 外文会议>IEEE Annual Northeast Bioengineering Conference >Nanoindentation measurements of viscoelastic material properties are sensitive to preparation techniques
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Nanoindentation measurements of viscoelastic material properties are sensitive to preparation techniques

机译：粘弹性材料性能的纳米压痕测量对制备技术敏感

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This study tests the hypothesis that bone's tissue level elastic and viscoelastic mechanical properties are altered by dehydration and that rehydration can be used to recover changes to bone's mechanical properties. When samples were exposed to short periods of dehydration(24 hours) during sample preparation trabecular bone elastic modulus increased 36%(p < 0.05) and tan ¿ decreased 33%(p < 0.05). However, following rehydration both elastic modulus and tan ¿ were restored such that there were no differences between rehydrated samples and fresh controls. Similar results were found in cortical bone. When samples were exposed to long periods of dehydration(30 days) in sample preparation cortical bone elastic modulus increased 28%(p < 0.05) and tan ¿ decreased 30%(p < 0.05). Following rehydration, elastic modulus increased such that there was no difference between rehydrated and fresh controls. However, while tan ¿ increased following rehydration(12%, p < 0.05), it was significantly lower than fresh controls (21%, p < 0.05). Interestingly, cortical bone exposed to long term dehydration recovered tan ¿ such that there were no differences between rehydrated samples and fresh controls. Viscoelastic material properties most strongly reflect the mechanical contributions of collagen; therefore, one possible explanation could be that long term dehydration alters collagen organization, potentially through cross-linking.
机译：这项研究检验了以下假设：脱水会改变骨骼组织水平的弹性和粘弹性机械性能，而补液可用于恢复骨骼机械性能的变化。当样品在样品制备过程中暴露于短时间的脱水（24小时）时，小梁骨弹性模量增加了36％（p <0.05），而tanγ下降了33％（p <0.05）。但是，补液后，既恢复了弹性模量又恢复了tanâ，从而使补液后的样品与新鲜对照之间没有差异。在皮质骨中发现了相似的结果。当样品暴露于长时间的脱水（30天）在样品制备中时，皮质骨弹性模量增加了28％（p <0.05），而tanγ降低了30％（p <0.05）。复水后，弹性模量增加，以致复水和新鲜对照之间没有差异。但是，虽然补水后棕褐色增加（12％，p <0.05），但显着低于新鲜对照组（21％，p <0.05）。有趣的是，暴露于长期脱水的皮质骨恢复了棕褐色，使得复水后的样品与新鲜对照之间没有差异。粘弹性材料的特性最强烈地反映了胶原的机械作用。因此，一种可能的解释可能是长期脱水可能会通过交联改变胶原组织。

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