Preparing and Studying the Effect of HA and ZrO2 Addition on Fracture Strength of Dental Ceramic


This work aims at preparing and studying the effect of hydroxyapatite (HA)and zirconia (ZrO2) additions on some physical properties and fracture strength ofdental ceramic. In this work, dental ceramic batches have been prepared from(80% Potash feldspar, 15% silica and 5% Duekhla kaolin). Firstly, HA wasadded with different percentages (2,4,6,8,10)%wt. Secondly, both of HAand ZrO2 have been added in percentage (5%wt) with different weightpercentages for both of HA and ZrO2 to (95%wt) of dental ceramic batch.Mixes were semi-dry pressed under (15 MPa) load, and they were fired at(1100°C) temperature. The results show the fracture strength of the dentalthat ceramic increases with the addition of HA. The best addition of HA was(4 %wt) because it gives the best of the physical and mechanical properties.By the addition of HA:ZrO2 mixture, the value of fracture strengthincreased more than the addition of HA alone.