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Copper and molybdenum uptake by the hard dental tissues of the rat.

A number of investigations have been carried out into the physiological relationship occurring between copper and molybdenum in differing animal species. The present study investigates this relationship in the hard dental tissues of the rat. Rats were fed varying amounts of either molybdenum, molybdenum and sulphate, molybdenum and copper, or molybdenum and sulphate. After 45 days the rats were killed and the teeth analysed by atomic absorption. The copper and molybdenum were complexed with ammonium pyrrolidine dithiocarbamate and extracted into methyl isobutyl ketone. Interference by other trace elements and macro-elements in the teeth was assessed. This study indicated that molybdenum retention in hard dental tissues of the rats was influenced only by the dietary molybdenum levels and not by dietary copper or sulphate. Similarly, the copper level was independent of the molybdenum and sulphate dietary levels but was influenced by the combined levels of copper and sulphate and also by the dietary copper level. However, the increased retention of both copper and molybdenum in the hard dental tissues due to increased levels of these elements in the diet occurs to a greater extent for molybdenum than for copper.