In this paper we showed that tot'hema eosin sensitized gelatin (TESG)

The quality of interface between composite resin materials and hard dental tissues is highly dependent on the polymerization light source. Newly developed blue light- emitting diode units for light polymerization of dental restorative materials are the most innovative light source technology in dentistry nowadays. The aim of this work was to estimate the depth of cure of five different light-activating composite resins exposed to different irradiation times (5s, 10s, 20s and 40s) when the experimental LED light source was used. The tested materials were: Tetric Ceram (Vivadent), Point 4 (Kerr), Admira (VOCO), Filtek Z250 (3M) and Diamond Lite (DRM Lab., Inc). The depth of cure testing was determined using a penetrometer. Results after 40s curing time were as following: the deepest depth of cure was achieved after application of Filtek Z 250, Diamond Lite Point 4 and Tetric Ceram. For the restorative material Admira was found the lowest depth of cure for the light exposure of 40s. An experimental LED light source achieved a sufficient depth of cure (over 2 mm) for all tested materials after curing time of 10s. The polymerization light source spectral distribution should be considered in addition to irradiance as a depth of cure indicator

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