Abstract
Objectives: This study was examined thesurface microhardness of three kind of bulk fillcomposites Surefil SDR flow, Tetric, EvoCeram,X-tra base)Materials and Methods: Ten specimens of2mm, 4mm thickness and 4mm diameter of eachbulk fill composite were polymerized using ahalogen light and a blue light-emitted diode.Microhardness evaluation was performed at the topand bottom surfaces for each specimen using aVickers microhardness tester.Results: All of the materials were cured withthe light sources and the values obtained for thebottom surfaces were found to be lower than thevalues of top surfaces. Highest microhardness level(40.02±4.06)among all composite materialsbelonged to Xtra base composite group, whereaslowest microhardness level (5.80±0.83) was ofSDR composite specimens.Conclusions: Hardness ratio range was between0.19±0.3 and 0.72±0.06. Hardness ratio value wasfound to be lower than 0.80 for all compositegroups.
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