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Morphological and histological analysis on the in vivo degradation of poly (propylene fumarate)/(calcium sulfate/β-tricalcium phosphate)

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Abstract

Poly (propylene fumarate)/(Calcium sulfate/β-tricalcium phosphate) (PPF/(CaSO4/β-TCP)) is a kind of biodegradable composite designed for bone tissue engineering. The in vitro degradation behavior of this composite has been investigated in our previous study. The aim of this study was to investigate the effects of PPF molecular weight and CaSO4/β-TCP molar ratio on the in vivo degradation of PPF/(CaSO4/β-TCP) composite and the bone tissue response to PPF/(CaSO4/β-TCP). Total 36 PPF/(CaSO4/β-TCP) composite samples were implanted into 15.0 mm segmental defects in tibiae of 18 Japanese rabbits, harvested at 2, 4 and 8 weeks after the operation, and analyzed using radiographic and histological analysis to assess the in vivo degradation of the composites as well as tissue response to the implants. The in vivo degradation results show that all the samples maintained their original shape. Tissues penetrated into the pores which formed by the degradation of CaSO4/β-TCP spheres near the surface of the composites. The rate of in vivo degradation and pore forming increased with a decrease in PPF molecular weight and an increase in CaSO4/β-TCP molar ratio. No inflammatory reaction was observed after implantation, and the composites are capable of in situ pore forming. In particular, the pore forming rate can be adjusted by varying the composition of the composites. These results may indicate that PPF/(CaSO4/β-TCP) is a promising osteogenic scaffold for its controllable degradation rate and excellent biocompatibility.

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Acknowledgements

The authors would like to acknowledge financial support from National Natural Science Research Foundation under grant number 50273026 and Tianjin Natural Science Research Foundation under grant number 043803511 and 10JCYBJC10900. We would also like to thank Dr. Li Zhaoyang from The University of Hong Kong for his great help of histological analysis.

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Authors and Affiliations

  1. Key Laboratory of Advanced Ceramics and Machining Technology (Tianjin University), Ministry of Education, Tianjin City, 300072, People’s Republic of China

    Zhongyu Cai & De-An Yang

  2. Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive, Singapore, 117576, Singapore

    Zhongyu Cai

  3. Department of Orthopaedics, Tianjin First Central Hospital, Tianjin, 300192, People’s Republic of China

    Tao Zhang, Dong-Ming Xu & Dong-Hao Xu

  4. Tianjin medical college, Tianjin City, 300222, People’s Republic of China

    Lizhi Di

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  1. Zhongyu Cai
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Correspondence to De-An Yang.

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Cai, Z., Zhang, T., Di, L. et al. Morphological and histological analysis on the in vivo degradation of poly (propylene fumarate)/(calcium sulfate/β-tricalcium phosphate). Biomed Microdevices 13, 623–631 (2011). https://doi.org/10.1007/s10544-011-9532-8

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