Abstract:Objective To investigate the effect of strontium (Sr) on the physical and chemical properties and osteogenic activity of magnesium phosphate cement (MPC) and the repairing effect of large area bone defect in animal model in vitro.Methods A new strontium / magnesium phosphate composite bone cement (Sr-MPC) was prepared by adding different mass percentage of Sr to MPC composed of reburned magnesium oxide and potassium dihydrogen phosphate,and the solidification time,mechanical strength,in vitro degradation rate,surface morphology,cell electron microscope and osteogenic activity of Sr-MPC were detected,and the rat parietal bone defect model was used and the tissue was studied by HE staining.Results Sr could make the microstructure of the new Sr-MPC more compact,prolong the solidification time,increase the mechanical strength and slow down the degradation rate.At the same time,it could enhance the expression of osteocalcin and runt-related transcription factor 2 to induce osteogenic differentiation.It also had a significant promoting effect on the repair of bone defects in animal models,especially the addition of 8% mass fraction of Sr-MPC had the most significant effect. Conclusion The physical and chemical properties of the new Sr-MPC have been effectively improved,at the same time,it can promote the repair of bone defects,so it has a certain research value.
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