Fig. 5
From: Εffect of cleansers on the composition and mechanical properties of orthodontic aligners in vitro
Gaussian curve-fitting of the ester peak of Invisalign (I) before (CO) and after treatments with Retainer Brite (RB), Retainer Cleaner (RC) and Steraligner (ST) cleaners. After RB treatment, two additional peaks appeared (1743 cm−1, 1672 cm−1) and the intensity of the peak at 1687 cm−1 was increased indicating changes in the H–bonding status of the ester groups (1750–1650 cm−1 range, absorbance scale, dotted lines: original spectra, r2: coefficient of determination for the goodness of curve-fit)