Preparation of multigradient hydroxyapatite scaffolds and evaluation of their osteoinduction properties  

作　　者：Hao Huang Anchun Yang Jinsheng Li Tong Sun Shangke Yu Xiong Lu Tailin Guo Ke Duan Pengfei Zheng Jie Weng 

机构地区：[1]Key Laboratory of Advanced Technologies of Materials(MOE),School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,P.R.China [2]Engineering Laboratory of Orthopedic Implant Device Development and Application Technology,Clinical College of Medicine,Southwest Medical University,Luzhou 646000,P.R.China [3]Department of Orthopaedic surgery,Children’s Hospital of Nanjing Medical University,Nanjing 210008,P.R.China

出　　处：《Regenerative Biomaterials》2022年第1期189-201,共13页再生生物材料（英文版）

基　　金：supported by the R&D Project in Key Areas of Guangdong(2019B010941002);the Key R&D Project for Social Development in Sichuan(2020YFS0455);Jiangsu Provincial Key Research and Development Program(CN)(BE2019608).

摘　　要：Porous hydroxyapatite(HA)scaffolds are often used as bone repair materials,owing to their good biocompatibility,osteoconductivity and low cost.Vascularization and osteoinductivity of porous HA scaffolds were limited in clinical application,and these disadvantages were need to be improved urgently.We used water-in-oil gelation and pore former methods to prepare HA spheres and a porous cylindrical HA container,respectively.The prepared HA spheres were filled in container to assemble into composite scaffold.By adjusting the solid content of the slurry(solid mixture of chitin sol and HA powder)and the sintering temperature,the porosity and crystallinity of the HA spheres could be significantly improved;and mineralization of the HA spheres significantly improved the biological activity of the composite scaffold.The multigradient(porosity,crystallinity and mineralization)scaffold(HA-700)filled with the mineralized HA spheres exhibited a lower compressive strength;however,in vivo results showed that their vascularization ability were higher than those of other groups,and their osteogenic Gini index(Go:an index of bone mass,and inversely proportional to bone mass)showed a continuous decrease with the implantation time.This study provides a new method to improve porous HA scaffolds and meet the demands of bone tissue engineering applications.

关 键 词：porous hydroxyapatite SCAFFOLD BIOCOMPATIBILITY OSTEOINDUCTION bone tissue engineering 

分 类 号：R318[医药卫生—生物医学工程]