Galvanic Shock

An example of this penomenon is when an amalgam restoration is placed on the occlusal surface of a lower tooth direclty opposing to a gold inlay or crown on an upper tooth. Because both restorations are wet with saliva, an electic couple exists with difference in potentioal between the dissimilar resorations. When the two metals are brought into contact, the potential is short-circuited through the two alloys. Have you touched with the spoon accidentally your amalgam fillings? The result is an upleasant, sharp, pain-line snappy feeling.

Since the silver-amalgam-mercury filling or the cadmium oxide coloring agent in the denture/partial's acrylic has less density than a cast dental alloy. The less stable metal component will give up particles as oxidation and releases them into the saliva. The blood will deliver then dangerous mercury or cadmium everywhere in the body, depositing them in vital organs, like the gray matter of the brain, bone marrow, etc. impariring their functions, creating health problems. Weakened memory, emotion, balance, vision and hearing are some of the symptoms of this little, constant, seemingly harmless electricity in the oral cavity.

The lesson to learn from this is to avoid those harmful materials in the mouth.