THE INFLUENCE OF SINTERING TEMPERATURE, SLIDING SPEED, AND SLIDING TIME ON THE WEAR RATE OF YTTRIUM-TETRAGONAL ZIRCONIA POLYCRYSTALS (3Y-TZP) FOR DENTAL APPLICATION

In this thesis, the samples of dental zirconia were sintered to various temperatures (1250,1350, and 1450) °C, and subjected to friction between them in saliva at two different sliding speeds (200 and 400 revolutions per minute) and in various periods (10, 20, and 30 minutes) by using pin on disc wear testing machine, the wear rate was affected by several factors (sintering temperature, sliding speed, and sliding time). Where the rate of wear decreased by the increase of one of these factors with the stabilization of the other two factors.