Objective: Today, parallel to the developments in technology, resin based nanocomposite materials have wide usage in dentistry. In this study, it was aimed to measure the physical properties of the materials by thermal analysis techniques when the controlled temperature program of the new restorative material obtained by adding different proportions of graphene material to the structure of the composite materials.

Materials and Methods: In this study, 4 different new generation composite materials Tetric EvoCeram Bulk Fill Composite (Ivoclar-Vivadent, Austria) (TEC), X-tra base Composite (Voco Cuxhaven Germany) (XTB), GC Essentia Composite (GC Corporation, Japan) (GCE), BRILLIANT EverGlow® Composite (Coltene, USA) (BEG) was used. Analytical balance with 0.5 and 2% graphene material was added to the structure of composite materials which were not polymerized by homogeneous mixer in dark environment. After the structural characterization of the obtained materials, Thermogravimetric analysis (TGA) and Differential Thermal Analysis (DTA) of these materials were evaluated. In the analysis of the data, one-way and two-way analysis of variance (ANOVA) was used to determine the interactions of the variables with the control group. Statistical significance was evaluated at P<0.05 and P<0.001 levels. The number of samples for each material was 10 (n = 10).

Results: When TGA analysis results were examined, 2% graphene added in TEC and XTB group caused weakness in chemical structure of the material and caused mass loss of materials at 451°C. When DTA analysis results were examined, it was seen that 2% and 0.5% of graphene additive strengthened the chemical structure of some materials while weakening the chemical structure some other materials.

Conclusion: The contribution of biocompatible materials such as graphene to the composite materials at different rates may strengthen the chemical and physical structure of the materials, while causing the opposite effect in some other composite groups.