Preparing and Studying the Effect of HA and ZrO2 Addition on Fracture Strength of Dental Ceramic
AbstractThis work aims at preparing and studying the effect of hydroxyapatite (HA)
and zirconia (ZrO2) additions on some physical properties and fracture strength of
dental ceramic. In this work, dental ceramic batches have been prepared from
(80% Potash feldspar, 15% silica and 5% Duekhla kaolin). Firstly, HA was
added with different percentages (2,4,6,8,10)%wt. Secondly, both of HA
and ZrO2 have been added in percentage (5%wt) with different weight
percentages 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 dental
that 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 strength
increased more than the addition of HA alone.
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