Abstract
The electron spin resonance (ESR) technique has been applied to the investigation of the resorption and creeping substitution of radiosterilized (3.3 Mrads dose) bone grafts in rabbits and dogs. The stable ESR signal arising from the radiation-induced structural defect in bone mineral was used as a biological label. the spin concentration and the total number of paramagnetic centres were measured before and after grafting. The gradual decrement of spin concentration as well as that of total number of paramagnetic centres were observed at varioust ime intervals after implantation. On the basis of the unusual stability and lack of chemical reaction of the paramagnetic centres involved, it is concluded that the decrease of the observed ESR signal intensities indicates progressive resorption and substitution. it seems that the proposed method can be useful for research o mineralized tissues.
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