Teeth are constantly in moisture, IMO leakage is necessary for an healthy physiological exchange & clearance.
The results observed over many years from Gold, silver, and copper alloys are still the best evidence for effective bacterial protection without biological side-effects.
Aesthetics seems to prevail over therapeutic responsible effective procedures....
microleakage tests on dental restorations have no clinical relevance at all. several reviews have shown the absence of correlation between leakage tests in vitro and clinical performance.
As Ivar Mjör said: microleakage tests are relevant for the researchers, as they can publish the results......
MMP are possibly responsable for detoriation of the hybrid layer on the long term, so could lead to increased microlekeage on the long term. So any relevance of this MMP problem is still absent, or it could be that after more then 10 years clinical service, a dramatic increase in restoration failure would occur, for which there is no indicationuntil now.....
I agree with Dr Opdam,I think, we can`t prepare situation of the mouth at all.