Fig. 5.

IR map of human dentin for each frequency coupled with corresponding AFM image which was captured during the mapping measurement to keep track of the sample drift. Area are 15 × 15 μm². (A) PO₄³⁻ν₃ at 1033 cm⁻¹. (B) S O stretching vibrations at 1336 cm⁻¹. (C) Amide I at 1692 cm⁻¹.