Setting Reaction of Dental Resin-Modified Glass Ionomer Restoratives as a Function of Curing Depth and Postirradiation Time

Figure 3

(a) FTIR spectrum of an RMGI sample in the range of 1800–1500 cm⁻¹: the peak at ~1724 cm⁻¹ indicates the ester bond (C=O str), the peak at ~1637 cm⁻¹ indicates the methacrylate C=C bond (C=C str), and the peak at ~1562 cm⁻¹ indicates the carboxylate salt formed (C=O str of COOM). (b) Deconvolution of the complex ester peak into three subpeaks: unionized carboxyl groups at ~1732 cm⁻¹, ~1724 cm⁻¹ and ester groups dependent on substitution at ~1708 cm⁻¹.

(a)

(b)