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The dental profession increase utilization of light-curable restorative materials nowadays. Conventional halogen light sources with newly developed, high-tech light activating units are simultaneously present in modern dentistry. The present study was conducted in order to characterize the degree of light irradiation absorption, and according to absorbed energy spectral distribution estimate the opportunity for application of the most compatible polymerization light source. As a material in this work six composite resins were tested: Admira (VOCO), Admira Flow (VOCO), Filtek P60 (3M), Helio Progress (Vivadent), Tetric Ceram (Vivadent) and Tetric Flow (Vivadent). Absorption spectra analysis pointed out the absorbance values of all tested composite resin materials were very close to absolution peak of Camphorquinone (468 nm). The most similar absorbance values (%) in relationsliip to wavelenght (nm) in comparasion to Camphorquinone absorption maximum were as follows: 99,47 % for Admira; 98,02 % for Filtec P60; 97,72 % for Tetric Ceram; 97,51 % for Helio Progress, and a bit smaller values were found for Admira Flow (96,21 %) and for Tetric Flow (94,21 %). The results in this analysis which was done by using a spectrophometer pointed out high degree absorption of light for tested materials could have significant influence on polymerization process, and also on proper choice of polymerization light source

Absorption spectar of six composite resins analyzed by using a spectrophotometer