Bioresorbable screws reinforced with phosphate glass fibre: Manufacturing and mechanical property characterisation
Bioresorbable screws reinforced with phosphate glass fibre: Manufacturing and mechanical property characterisation
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DOI：
10.1016/j.jmbbm.2012.08.001
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发表时间：
2013-01-01
影响因子：
3.9
通讯作者：
Rudd, C. D.
中科院分区：
文献类型：
--
作者：
Felfel, R. M.;Ahmed, I.;Rudd, C. D.
使用生物可吸收螺钉可以消除与金属相关的缺点，如取出操作、腐蚀、MRI干扰和应力屏蔽。单独的生物可吸收聚合物的机械性能不足以作为螺钉应用于承载应用。因此，加强是必要的，以尝试和匹配或超过皮质骨的机械性能。采用磷酸盐玻璃纤维增强聚乳酸（PLA），制备单向排列（UD）和单向加随机分布（UD/RM）复合材料螺钉（P40 UD和P40 UD/RM）。与PLA螺钉相比，复合螺钉（P40 UD和P40 UD/RM）的最大弯曲和推出性能几乎增加了100%。虽然无头复合螺钉的拔出强度和刚度比PLA高出80%（强度）和130%（刚度），但由于头部失效，无头复合螺钉的性能低于单独使用PLA的螺钉。与PLA螺钉相比，还观察到复合螺钉的最大剪切载荷和刚度增加（相似于30%和相似于40%）。PLA螺钉的最大扭矩与1000 mN m相似，而复合材料螺钉的最大扭矩略低。P40 UD和P40 UD/RM螺钉的SEM显微照片显示纤维周围存在小间隙，这可能是由于制造过程中UD纤维屈曲所致。(C)2012爱思唯尔有限公司保留所有权利。
Use of bioresorbable screws could eliminate disadvantages associated with metals such as removal operations, corrosion, MRI interference and stress shielding. Mechanical properties of bioresorbable polymers alone are insufficient for load bearing applications application as screws. Thus, reinforcement is necessary to try and match or surpass the mechanical properties of cortical bone. Phosphate based glass fibres were used to reinforce polylactic acid (PLA) in order to produce unidirectionally aligned (UD) and unidirectionally plus randomly distributed (UD/RM) composite screws (P40 UD and P40 UD/RM). The maximum flexural and push-out properties for the composite screws (P40 UD and P40 UD/RM) increased by almost 100% in comparison with the PLA screws. While the pull-out strength and stiffness of the headless composite screws were similar to 80% (strength) and similar to 130% (stiffness) higher than for PLA, those with heads exhibited properties lower than those for PLA alone as a result of failure at the heads. An increase in the maximum shear load and stiffness for the composite screws (similar to 30% and similar to 40%) in comparison to the PLA screws was also seen. Maximum torque for the PLA screws was similar to 1000 mN m, while that for the composite screws were slightly lower. The SEM micrographs for P40 UD and P40 UD/RM screws revealed small gaps around the fibres, which were suggested to be due to buckling of the UD fibres during the manufacturing process. (C) 2012 Elsevier Ltd. All rights reserved.