Effect of Artificial Saliva on the Apatite Structure of Eroded Enamel
Figure 4
Shift of the major ATR IR peak near 1015 cm−1 for enamel stored in saliva (a) and for enamel stored in saliva and additionally exposed to NaF (b); each treatment with citric acid (CA) was performed for 1 min; the time of enamel storage in saliva is given with respect to the last treatment with citric acid; each treatment with NaF was performed for 5 min. The peak positions in (a) and (b) were obtained using a four-Lorentzian model to fit the spectrum profiles between 900 and 1200 cm−1. (c) displays the integrated intensity of the lower-wavenumber side signal (see Figure 3) normalized to the total absorption intensity between 900 and 1200 cm−1, when a five-Lorentzian model was applied to fit the spectrum profiles between 900 and 1200 cm−1 of samples stored in saliva and additionally exposed to NaF; for simplicity, only the points representing the citric-acid treatment are marked in (c); all other points exactly correspond to the points in (b).
