Experimental Study and mathematical
modeling for behavior of Amalgam at Different periods of the
filling |
This work involves experimental study
for corrosion of amalgam as filling material after different
period time (0, 7, 14, 21, 35, 42 days) in artificial saliva by
electrochemical method to estimate corrosion parameters such as
corrosion potential Ecorr, corrosion current density icorr, and
Tafel slopes bc&ba. The results of polarization resistance which
calculated according to Stern- Geary equation indicates that the
resistance of amalgam was increased during the experimental
period due to stable phases which produced between mercury and
other powders in amalgam such as Sn–Hg and Ag–Hg, in addition to
Ag–Cu and Ag–Sn phases. Cyclic polarization test shows that the
reverse scan curves meet the forward scan curve along the
passive range.Numerical modeling was achieved to estimate the
corrosion behavior of amalgam in artificial saliva through
longer period time, the results of this modeling shows that
values of polarization resistance for amalgam at long time of
filling decreases with time, but after 2200 days of filling,
i.e. after at least 6 years. |
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