6. Gold alloy â gold-colored mixture of gold, copper and other metals, and is used mainly for crowns, fixed bridges and some partial denture framework. 1  Advantages â good resistance to further decay if fits well; excellent durability-does not fracture under stress; does not corrode in the mouth.or more than 150 years, dental fillings known as amalgams have been widely used to treat tooth decay. Amalgam fillings are made of a mixture of metals. The ingredients include equal parts of elemental mercury (43 to 54 percent), and an alloy powder (46 to 57 percent) mainly composed of silver, tin, copper.
limit order. Definition. An order to a broker to buy a specified quantity of a security at or below a specified price, or to sell it at or above a specified price (called the limit price). This ensures that a person will never pay more for the stock than whatever price is set as his/her limit.
A stop order, sometimes called a stop-loss order, is used to limit losses; it instructs the broker to execute a trade when a stock reaches a price beyond which the investor is unwilling to sustain losses. For buy orders, this means buying as soon as the price climbs above the stop price. For sell orders, this means selling as soon as the price drops below the stop price. This comparison uses stocks in the definitions and examples because that is the most common scenario for individual investors. However, stop and limit orders can be placed for all kinds of securities, including options and futures.