Effects of thermal change and third-body media particle on wear behaviour of dental restorative composite materials

The aim of this work was to examine the effect of thermal change cycle and the third-body media particle on the wear behavior of four different composite materials. All specimens were kept in distilled water for 1 week and determined Vicker's hardness and surface roughness values before contact-free wear tests. Then contact-free wear test procedures were performed using a dual-axis chewing simulation. The mean volume loss of all specimens after the contact-free wear tests was determined with use non-contact 3D profilometer. In this study tested all composite materials showed significantly more volume loss when occurred thermal load than constant 37 degrees C irrespective of third-body media particle after contact-free chewing tests. It can be suggested in this work that the larger monomer and harder surface glass structure contained in the composite material causes more volume loss when occurred thermal change loading wear mechanism.