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BACKGROUND: With the improvement in medical level, the clinical demand for bone repair materials is gradually Increasing, and the requirements are also getting more and more. OBJECTIVE: To review the related research progress In the field of bone repair materials In recent years, to analyze the advantages and disadvantages of different materials, and to guide future development In this research field. METHODS: A computer-based online search of CNKI, Wanfang, PubMed, Web of Science databases was performed to retrieve papers published during 1950-2019 with the search terms “tissue engineering, bone repair material, bone defect, natural bone material, bone graft replacement material, traditional Chinese medicine” in Chinese and English. A total of over 900 papers were retrieved, and 68 of them were included In the final analysis. RESULTS AND CONCLUSION: In recent year, with the flourish development of bone tissue engineering, the research of bone tissue repair materials is in the ascendant. In addition to optimizing natural bone, a variety of bone graft substitute materials have been developed, for example, natural macromolecule materials, synthetic macromolecule materials, biomedical ceramics materials, biomedical metal materials, etc., but these materials have different properties. Although there are many bone repair materials at present, the Ideal bone repair materials are few. Therefore, bone tissue repair and bone remodeling is still one of the urgent orthopedic problems to be solved In the clinic. In addition, the traditional Chinese medicine for bone repair, such as pyritum combined with modern bone repair materials, can effectively avoid some of the drawbacks of the current bone repair materials, thereby effectively treating bone defect diseases. This deserves In-depth investigation In the field of bone repair.
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Objective To verify the feasibility of applying hydrothermal synthesis for preparing oyster hydroxyapatite(HA) and to develop a preparation method of oyster HA porous material for bone repair.Methods Hydrothermal synthesis was applied for preparing oyster HA,and the reaction condition was 220 ℃ for 6 h.Then,the prepared oyster HA was used as the raw material for porous scaffold preparation by sponge-soaking and sintering,successively.The porosity and compressive strength of the scaffold were adjusted by controlling the soaking time and absorbed HA slurry of the sponges.Results Hydrothermal synthesis was an effective method for preparing oyster HA.When the volume of the sponge cube was 1 cm3,the material absorbed by one to three times sponge-soaking were 0.184 8 g,0.318 1 g and 0.426 1 g,respectively,the corresponding porosity were 91.5％,82.9％ and 78.5％,and the compressive strength were 1.06 MPa,3.99 MPa and 8.49 MPa.Conclusion The oyster shell powder can be effectively converted into HA under the hydrothermal reaction condition of 220 ℃ for 6 h.The preparation of HA porous bone repair material by sponge-soaking method can obtain ideal porosity and mechanical strength.However,in this preparation process,the number of sponge-soaking and the weight of the absorbed HA slurry should be exactly controlled in order to obtain desired properties.