Abstract
A radial segmental defect model of a rabbit was used to study the restoration effect on defects treated with chitosan-coated pressed calcium sulfate pellets combined with recombinant human bone morphogenetic protein-2 (rhBMP-2), coated pressed calcium sulfate pellets, and uncoated pressed calcium sulfate pellets. Nothing was implanted in the control group. After 4, 8, and 12 weeks, the results indicated that coated pressed calcium sulfate pellets combined with rhBMP-2 and coated pressed calcium sulfate pellets facilitated new bone formation on defected bones and that, particularly, the coated pressed calcium sulfate pellets combined with rhBMP-2 was more effective than the coated pressed calcium sulfate pellet. Histologic and tetracycline fluorimetric findings showed that the osteogenesis mechanism of chitosan-coated pressed calcium sulfate pellets is membrane bone formation, and the pellets showed slightly slower resorption that closely coincides with the growth rate of new bone.
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