Effect of Artificial Saliva on the Apatite Structure of Eroded Enamel
ATR IR spectra of untreated enamel (dashed line), treated with citric acid (CA) for 1 min (thin gray line), treated with CA for 1 min and then stored in saliva (S) for 4 h (bold black line), and treated with CA for 1 min, then stored in saliva for 24 h, and treated again with CA for 1 min (thin black line) (a); experimental spectrum of enamel treated with CA for 1 min and then stored in saliva for 4 h (bold black line) fitted with 5 Lorentzians (thin gray lines) and the resultant profile (dashed gray line) (b). The arrow in both plots points to the lower-wavenumber shoulder observed for enamel subsequently stored in saliva for 4 h, the position of which matches the position of the major ATR IR peak for untreated enamel.
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