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High-strength mineralized collagen artificial bone

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Abstract

Mineralized collagen (MC) is a biomimetic material that mimics natural bone matrix in terms of both chemical composition and microstructure. The biomimetic MC possesses good biocompatibility and osteogenic activity, and is capable of guiding bone regeneration as being used for bone defect repair. However, mechanical strength of existing MC artificial bone is too low to provide effective support at human load-bearing sites, so it can only be used for the repair at non-load-bearing sites, such as bone defect filling, bone graft augmentation, and so on. In the present study, a high strength MC artificial bone material was developed by using collagen as the template for the biomimetic mineralization of the calcium phosphate, and then followed by a cold compression molding process with a certain pressure. The appearance and density of the dense MC were similar to those of natural cortical bone, and the phase composition was in conformity with that of animal’s cortical bone demonstrated by XRD. Mechanical properties were tested and results showed that the compressive strength was comparable to human cortical bone, while the compressive modulus was as low as human cancellous bone. Such high strength was able to provide effective mechanical support for bone defect repair at human load-bearing sites, and the low compressive modulus can help avoid stress shielding in the application of bone regeneration. Both in vitro cell experiments and in vivo implantation assay demonstrated good biocompatibility of the material, and in vivo stability evaluation indicated that this high-strength MC artificial bone could provide long-term effective mechanical support at human load-bearing sites.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Zhi-Ye Qiu, Chun-Sheng Tao & Fu-Zhai Cui

  2. Beijing Allgens Medical Science & Technology Co. Ltd., Beijing, 100176, China

    Helen Cui & Chang-Ming Wang

Authors
  1. Zhi-Ye Qiu
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  2. Chun-Sheng Tao
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  3. Helen Cui
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  4. Chang-Ming Wang
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  5. Fu-Zhai Cui
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Correspondence to Fu-Zhai Cui.

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Qiu, ZY., Tao, CS., Cui, H. et al. High-strength mineralized collagen artificial bone. Front. Mater. Sci. 8, 53–62 (2014). https://doi.org/10.1007/s11706-014-0237-9

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  • DOI: https://doi.org/10.1007/s11706-014-0237-9

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