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when any restorative material (dental cement or amalgam) is filled in the tooth cavity, it adapt to tooth structure chemically or mechanically. But irrespective of material used, there is more or less micro gap between tooth structure and the filling material.

Which can allow the oral fluids to enter into it and can cause marginal leakage or marginal staining.

This entry of the fluid into the micro leakage of the restoration is known as percolation.

Dr. Uday S. Mahale

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