Effects of rotating fatigue on the mechanical properties of microhybrid and nanofiller-containing composites

Abstract

The objective of this study was to assess and compare the flexural strength and Vickers hardness of five nanofiller-containing composites (Filtek Supreme XT, Gradia Forte, Luna-Wing, GNH400N, GCUC) against five microhybrid composites (Meta Color Prime Art, Solidex, Estenia C&B, Ceramage, Clearfl Majesty) before and after rotating fatigue test (RFT). For each resin composite, 16 rectangular beam specimens (2 mm×2 mm×25 mm) were prepared and half of which were subjected to 1×104 cycles in RFT. Flexural strength was determined using a three-point bending test. Vickers hardness measurements were carried out on specimens which failed after the three-point bending test. When under the influence of rotating fatigue, the flexural strength of all composites was affected by multiple factors. In contrast, rotating fatigue had no significant influence on the Vickers hardness of both microhybrid and nanofiller-containing composites.