RESUMEN
ObjectiveTo study absorbed mechanism of free bone auto-graft in cranium.MethodsTwenty-four adult New Zealand rabbits were randomly divided into two groups of twelve each. Cranium graft or rib graft was implanted on each side of the cranium. The onlay graft was harvested at the 12th and 24th week, and the collagen fibers were scrutinized under scanning electron microscope. ResultsThe number of the bone collagen fibrils at twenty- fourth week was more than that of the twelfth week, the arrangement of collagen fibrils at the twenty- fourth week was more regular than that of the twelfth week, and the collagen fibrils of the cranium graft were more numberous and regular than those of the rib graft observed at the twelfth week, but they were similar at twenty - fourth week. ConclusionRemoding time of cranium graft is shorter than that of rib graft, but bone remoding of both cranium and rib has finished in 24th week after operated.