Abstract
The effects of Co60 and 200-kv radiation on the jaws and dental structures of rats at doses of 1020 to 2040 r were compared. Co60 radiation was much less damaging to bone and dental tissues than 200-kv radiation in comparable dosages. This confirmed clinical impressions concerning the bone- sparing attributes of Co/sup 60/ radiation. Considerably higher dosages can be given with Co60 than with 200-kv radiation. All animals exposed to 200-kv radiation showed alterations in alveolar bone, more severe reactions occurring in animais given 2040 r. There was a decreased density and irreguiarity in the staining of the periodontai membrane, so that the outiines of the interdental septum of alveolar bone were sharp and clearly demarcated. The number of fibroblasts was reduced in the periodontal membrane, and the cells were smaller, rounded, and more deeply stained. Cementoblasts aiong the tooth surface were fewer and bone itself preserted a granularity in staining and pyknosis in osteocytes. The results suggest that a 10% greater dose in megavoltage rads is necessary for an equivalent biologic effect.
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