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首页> 外文期刊>Journal of Biomechanics >Fracture toughness and work of fracture of hydrated, dehydrated, and ashed bovine bone.
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Fracture toughness and work of fracture of hydrated, dehydrated, and ashed bovine bone.

机译：牛骨水合，脱水和灰化的断裂韧性和断裂功。

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Bone, a tri-phase composite, consists of nano-sized apatite minerals, an organic component, and water. Heat-treated bovine cortical bone has been proposed as a candidate for void-filling bone substitute. However, the toughness of heat-treated bone is not yet fully studied. Fracture toughness (K(c)) and work of fracture (W(f)) of hydrated, dehydrated, and ashed bovine bone were estimated using a single-edge V-notched beam method. Thermal gravimetric analysis and differential thermal analysis were used to determine the temperature at which the organics and water were removed. Dehydrated specimens were obtained by placing the samples in a 60 degrees C vacuum oven for 24h or a 110 degrees C furnace for 2h. Ashed specimens were obtained by heat-treating samples at 600 degrees C for 24h. K(c) of bovine specimens decreased from 5.5MPa.m(1/2) for hydrated bone, to 3.8MPa.m(1/2) for dehydrated specimens, and to 0.36MPa.m(1/2) for ashed specimens. W(f) decreased from 7.1 to 1.1kJ/m(2) for dehydrated specimens, and to 0.04kJ/m(2) for ashed specimens. The main reasons for the significant decreases in K(c) and W(f) may be attributed to water's ability in stabilizing collagen structure and to the organics' ability in making bone more ductile. Because of the large decrease in fracture toughness and work of fracture, we suggest that ashed bone is not appropriate for load-bearing bone substitute in areas where bone experiences loadings in flexure.
机译：骨是一种三相复合材料，由纳米级磷灰石矿物，有机成分和水组成。已经提出了热处理的牛皮质骨作为填充骨替代物的候选物。但是，热处理骨的韧性尚未得到充分研究。水合，脱水和灰化牛骨的断裂韧性（K（c））和断裂功（W（f））使用单边V型缺口梁法估算。使用热重分析和差热分析来确定除去有机物和水的温度。将样品放在60摄氏度的真空烘箱中放置24h或在110摄氏度的熔炉中放置2h，即可得到脱水样品。通过将样品在600摄氏度下热处理24小时获得灰化的样品。牛标本的K（c）从水合骨的5.5MPa.m（1/2）降低到脱水标本的3.8MPa.m（1/2）和灰化标本的0.36MPa.m（1/2） 。对于脱水样品，W（f）从7.1降至1.1kJ / m（2），而对于灰化样品，W（f）从0.04kJ / m（2）降低。 K（c）和W（f）显着降低的主要原因可能归因于水稳定胶原蛋白结构的能力以及有机物使骨骼更具延展性的能力。由于断裂韧性和断裂功大大降低，我们建议在骨承受弯曲载荷的区域中，骨灰不适合作为承重的骨替代物。

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