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Average IR spectra recorded on the dentin surface after sanding (SL, black), treatment with 10% EDTA (Tubuliclean 10%) (blue), aging in SBF for 24 h (T24h, green) and two months (T2m, red). The bands prevalently assignable to collagen (Col), water, and B-type carbonated apatite (Ap) are indicated.
