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Figure 3: Kinetics of phosphate loss during incubation of enamel slabs for 120 s with and without application of different preparations in situ. Physiological 30 min pellicles (without rinse) and specimens without pellicle served as controls. On the whole, the phosphate release reducing effect of the calcium phosphate and apatite based products appeared inferior to fluoride. Please note the different scale; subjects; enamel samples per subgroup; mean values ± standard deviation.