References SOM A. Materials and Methods

Triethylene glycol dimethacrylate (TEGDMA) was formulated with 1.0 wt % (±)-camphorquinone (CQ) as a visible light active photoinitiator, 0.5 wt % ethyl 4-(dimethylamino)benzoate (EDAB) as coinitiator and 3.0 wt % tetraethylthiuram disulfide (TED) as a near UV active photoinhibitor. Visible light was provided by a light-emitting diode (LED)-based dental lamp (GC America) with a narrow emittance curve centered at 469 nm while UV light was provided by a high pressure mercury vapor lamp (EXFO) equipped with a filter to isolate the 365 nm spectral line. Irradiation intensities were measured with an International Light IL1400A radiometer. All polymerizations were performed at room temperature. Fourier transform infrared (FT-IR) spectroscopy studies were conducted with a Nicolet Magna-IR 760 spectrometer. Monomer was sandwiched between two NaCl crystals in a horizontal transmission apparatus described in another work (S1). Series scans were recorded, with spectra collected at a rate of approximately two per second. Methacrylate conversion was monitored by the disappearance of the carbon–carbon double-bond absorption peak at 1637 cm-1. Conversions were calculated from the ratio of peak area during polymerization to the peak area prior t