7. Galvanic shock

➔ Patient shows pain.
➔ Dissimilar metal.
➔ Amalgam vs Gold, ceramic
➔ RX Plan ー no RX required if no galvanic shock.
➔ Change restoration if pain is seen in the one done recently or varnish over restoration.


8. Delayed Expansion

➔ Caused due to insufficient trituration & condensation
➔ Also moisture contamination during either trituration / condensation – it’s the principle cause of amalgam failure.
➔ Careful of moisture contamination.
➔ Zn + H2O = release of hydrogen gas
➔ No particular time period.
➔ Cracks can be seen.
➔ RX ー change restoration.