Abstract
The fatigue parameters of dental resin composites Ceram-X Mono, Clearfil Majesty and Saremco Els were studied. The dynamic fatigue method was used to obtain the crack growth exponent n and a material constant dependent on the test environment and initial material strength, sigma(fo), through linear regression analysis. Clearfil Majesty showed a lower n than Ceram-X Mono and Saremco Els, but the highest sigma(fo). Fractographic analysis revealed that the fracture origin was located on or near the surface opposite to loading. Fatigue parameters obtained from dynamic testing provide significant information about the mechanical degradation rate of the materials.