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In high copper alloy, copper is added to improve mechanical properties, resistance to corrosion and marginal integrity. [19] The higher copper is supplied by either the silver-copper eutectic or the Cu 3 Sn (ε) phase. [12] The fact that tin had a greater affinity for copper than for mercury meant that the gamma-2 phase was reduced or ...
Fillings are recommended for small to medium-sized restorations. Inlays and onlays are more expensive indirect restoration alternative to direct fillings. They are supposed to be more durable, but long-term studies did not always detect a significantly lower failure rate of ceramic [21] or composite [22] inlays compared to composite direct ...
Zinc amalgam finds use in organic synthesis (e.g., for the Clemmensen reduction). [3] It is the reducing agent in the Jones reductor, used in analytical chemistry.Formerly the zinc plates of dry batteries were amalgamated with a small amount of mercury to prevent deterioration in storage.
In 1855, Dr. J. Foster Flagg, a professor of dental pathology in Philadelphia, experimented with new mixtures of amalgam. In 1861, he presented his findings to the Pennsylvania Association of Dental Surgeons and, in 1881, he published his book, Plastic and Plastic Fillings. (Amalgam fillings were often called "plastic fillings" at the time.)
Lead fillings were used in the 18th century, but became unpopular in the 19th century because of their softness. This was before lead poisoning was understood. According to American Civil War-era dental handbooks, since the early 19th century metallic fillings had been made of lead, gold, tin, platinum, silver, aluminum, or amalgam. A pellet ...
A high-speed tapered diamond bur has the most convenient shape to prepare the buccal, lingual and proximal reduction of the tooth. In the majority of clinical situations an inlay preparation is being made from a tooth that already has a Class II restoration and is being prepared to protect the tooth.