[Analytic experiments on the significance of the fluorine content of urinary calculi (author's transl)].

The fluorine content of 150 precisely differentiated urinary calculi from areas with and without fluoridated drinking water (FDW) was quantitatively determined using different analytic methods. The fluorine content differed according to the type of calculus. With an average of 2 mg/g of calculus substance, the whewellite or weddellite concretions in FDW areas have the greatest portion of fluoride. The degree of crystallization of carbonate calculi increases with increased percentage of fluorine, and the parameter of the reticulum is characteristically contracted.