FTIR spectra of VF, Constic and Activa, initial and final (1200 s) spectra.

Absorbance changes due to polymerisation can be seen at the C-O stretch doublet at 1300 and 1320 cm^-1 together with 1636 [v(C = C)] bond, highlighted in grey. Samples with 2 mm thickness, light cured for 20 s (n = 3).