Abstract
From the literature which has so far been published it is not possible to draw definite conclusions about the relation between the phosphate content of human saliva and caries; this paper therefore examines these relations from a new point of view. The examination concerned the amount of oxygen uptake of human saliva as well as the following phosphate fractions—total phosphate (i.e. the sum of all organic and inorganic phosphate compounds), total phosphate in de-albumenized supernatant and inorganic phosphate. From these data the values for organic phosphate which is soluble in acid and for non-acid soluble organic phosphate were calculated. Great care was taken to obtain the saliva of a person under certain carefully described conditions. The results show a definite correlation between the oxygen uptake and all kinds of phosphates. Dividing the test persons into caries active persons and caries resistant ones, we obtain the following average values whose differences are statistically high significant with the exception of the phosphate soluble in acid: Total P Total P in sediment Inorganic P Organic P (soluble in acid) Organic P (not soluble in acid) Caries resistant 48,3 40,6 37,6 3,1 7,4 (mg/100 ml) Caries active 29,3 26,2 24,3 2,1 3,1
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