Fig. 3From: Influence of irradiation distance on the mechanical performances of resin composites polymerized with high-irradiance light curing unitsRepresentative Raman spectra of the Z3P in the spectral region of 1590–1680 cm−1. A Raman spectra of the Z3P according to the irradiation distance with a constant irradiation time of 20 s, B Raman spectra of the Z3P according to the irradiation time with an irradiation distance of 8 mmBack to article page