الفهرس 
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Abstract
The present study was carried out using one available gallium- based dental alloy (Galloy), and two high copper dental amalgam systems, one of the admixed type (GS.80), and the other is unicompositional Lojic).
A total number of 195 samples were prepared according to manufacturer’s instructions and ADA specifications no
and classified into four groups:
Group A: 15 samples, (5 of each alloy type), were constructed for testing the as-prepared microstructure, using scanning electron microscope.
Group B: 30 samples, (10 of each alloy type), were constructed for :sting the potentiodynamic corrosion, using potentiogalvano scan. Five samples of each alloy type were tested in 0.1% NaCI electrolytic solution, d another five were tested in 1% NaC1 electrolytic solution.
Group C: 75 samples, (25 of each alloy type), were constructed for szing the hardness, using Vicker’s microhardness tester five samples.