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Average rate (per hour) of calcium ions released for BAG 81 and BAG 61 composites prior to and after recharging with 5,000 ppm fluoride ions (n=5); time is given as the total elapsed time, and the error bars represent standard deviation. The insert is for the 2 h time point: the average rate of Ca released from the BAG 61 composite was 3.3 ppm/h.
