Preparation and characterization of hemihydrate calcium sulfate-calcium hydroxide composite bone repair materials

Objective: To prepare a bone repair material with certain mechanical strength and biological activity, this paper used calcium sulfate hemihydrate (CSH) powder compounded with calcium hydroxide (Ca(OH)2) powder to prepare a bone repair scaffold material for physicochemical property characterization and testing. Methods: The physical and chemical properties and characterization of the dried and cured bone repair materials were determined by Fourier infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy;Universal material testing machine to determine the mechanical and mechanical strength of composite materials. Results: XRD showed that the structure of the composite material phase at 5％ concentration was calcium sulfate hemihydrate and calcium hydroxide after hydration. The FT-IR and XRD analyses were consistent. Scanning electron microscopy (SEM) results showed that calcium hydroxide was uniformly dispersed in the hemihydrate calcium sulfate material. 0％, 1％, 5％, and 10％ specimen groups had compressive strengths of 3.86±3.1, 5.27±1.28, 8.22±0.96, and 14.4±3.28 MPa. 10％ addition of calcium hydroxide significantly improved the mechanical strength of the composites, but also reduced the the porosity of the material. Conclusion: With the addition of calcium hydroxide, the CSH- Ca(OH)2 composite was improved in terms of mechanical material and is expected to be a new type of bone repair material.