A comparison of wear rate of direct and indirect resin composites: A two-body wear abrasion test

PurposeThe objective of this in vitro study was to investigate and compare two-body wear of hybrid, microhybrid, and nanohybrid direct and indirect composite resins.Materials and methodsA pin-on-disc wear device was used to study the effects of the water on two-body wear rate of two microhybrid composites (Solidex® and Dialog®), a nanohybrid composite (Grandio®SO), and three direct composite resins: a hybrid composite (Herculite Classic™), a submicron hybrid composite (Charisma®), and a nanohybrid composite (Tetric® N-Ceram). For testing, 12 specimens of each material with 6.5 mm diameter and 4 mm height were made and half of the specimens were stored in the distilled water for 1 week at 37℃. In order to evaluate the wear rate of samples, a normal load of 15 N was applied to specimen’s surface. The 6.5 mm diameter composite sample held to pin holder and AISI 316 L stainless steel was employed as the disc. The following experimental parameters were kept constant for all tests: sliding velocity = 0.6 m/s, t...