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Mineral content gradients in two composite enamel pearls from permanent human upper molars were measured by X-ray microtomography (XMT) at a resolution of 15-30 μm. This non-destructive microscopic technique was used to make 15-μm thick XMT slices with 100-μm separation through one pearl and 250-μm separation through the other. Average mineral contents were calculated from the linear absorption...
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