The effect of admixing Al2O3 on some properties of high copper dental amalgam

الملخص EN

In recent years, there have been many attempts to improve properties of dental amalgam.

The aim of this study is to investigate the effect of additional Al2O3 on properties of high copper dental amalgam.

Al2O3 is added in different percentages (0.1, 0.2, 0.3, and 0.4wt %).

The specimens were prepared according to A.D.A specification No.

1.

The specimens have been stored at 37 ± 1 Cº by using glass chamber prepared for this purpose.

The prepared specimens are characterized by different types of tests such as creep, hardness, dimensional change, microstructure by optical microscopic and corrosion test.

The results show that the hardness increase with increasing Al2O3 percentage.

Results of creep resistance are within the approved percentage of A.D.A., dimensional change is less than the approved percentage by A.D.A.

also.

The best corrosion resistance is at 0.2 and 0.4wt % of Al2O3 with improving (60 %) and (55 %) respectively.