Effect of organic peroxide additives on wear resistance of composite resin

The wear resistance of four proprietary posterior composite resins and amalgam were evaluated by an in vitro wear-testing system. Direct and indirect composite restorations were placed on occlusally flattened extracted molars. They were subjected to 400,000 cycles of artificial chewing. The vertical distance between the cavosurface margin and the worn occlusal surface, was measured to indicate the wear resistance of the restorative materials. The restorative systems, including a peroxide modifier, exhibited dramatic increases in wear resistance. The heat-treated composite inlay system exhibited minimal wear values compared to all other composite resins in the study. This system exhibited wear values that were less than those of the amalgam control group.