Three body wear studies of five dental composites preconditioned in food simulating media

Progressive three body wear up to 30 min for five dental composites (Concise, Heliomolar, Occlusin, P-30, Profile, TPH) stored for 9 months at 37 degrees C in citrate, lactate and PBS buffers, 25 and 75% ethanol media, has been measured using a wear tester. Particle size of the filler and the storage media are found to play dominant roles in determining the extent of wear. Heliomolar, which is a microfilled composite, shows maximum wear whereas wear is least in composites containing filler particles of conventional and hybrid size such as P-30 (>1 mu m) The storage media is found to attack and degrade glass filler particles compared to composites having quartz fillers.