Figure 1. Areas analyzed by FTIRI in bovine incisors: 3rd-trimester I2 developing incisor (a) and year-old I4 incisor (b). Young dentin (cervical) and older dentin (mid-crown and incisal) areas are noted. Rectangles indicate areas analyzed. Cervical and incisal areas analyzed as controls also indicated on year-old incisor (c). Spectra extracted from mantle dentin area of fields analyzed in incisor (a) at various distances from the cervix of the tooth [as indicated in (a)] and in incisor (b, stippled spectrum). ₁,₃ PO₄³⁺ and Amide I bands noted. Pulp, dentin, and enamel are shown in (a). Bar = 0.5 mm.

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