3D Printed Zn-doped Mesoporous Silica-incorporated Poly-L-lactic Acid Scaffolds for Bone Repair

Guowen Qian, Lemin Zhang, Guoyong Wang, Zhengyu Zhao, Shuping Peng, Cijun Shuai

Article ID: 346
Vol 7, Issue 2, 2021, Article identifier:

VIEWS - 288 (Abstract) 48 (PDF)

In Press, Corrected proof, Published online March 10, 2021


Abstract


Poly-L-lactic acid (PLLA) lacks osteogenic activity, which limits its application in bone repair. Zinc (Zn) is widely applied to strengthen the biological properties of polymers due to its excellent osteogenic activity. In the present study, Zn-doped mesoporous silica (Zn-MS) particles were synthesized by one-pot hydrothermal method. Then, the particles were induced into PLLA scaffolds prepared by selective laser sintering technique, aiming to improve their osteogenic activity. Our results showed that the synthesized particles possessed rosette-like morphology and uniform mesoporous structure, and the composite scaffold displayed the sustained release of Zn ion in a low concentration range, which was attributed to the shield effect of the PLLA matrix and the strong bonding interaction of Si-O-Zn. The scaffold could evidently promote osteogenesis
differentiation of mouse bone marrow mesenchymal stem cells by upregulating their osteogenesis-related gene expression. Besides, Zn-MS particles could significantly increase the compressive strength of the PLLA scaffold because of their rosettelike morphology and mesoporous structure, which can form micromechanical interlocking with the PLLA matrix. The Zn-MS particles possess great potential to improve various polymer scaffold properties due to their advantageous morphology and
physicochemical properties.


Keywords


Poly-L-lactic acid, Zinc doped mesoporous silica, Bone repair

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References


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DOI: http://dx.doi.org/10.18063/ijb.v7i2.346

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