Answer you can increase the strength of an electromagnet by:   1) Increasing the current flow   2) Increasing the number of coils   3) Passing an 'iron core' throu â¦ gh the coil of the electromagnet. + 63 others found this useful. FrmtheAngel Johnson.
Crowns can be made of a variety of different materials and new materials are continually being introduced. Some of the most popular options are listed below. Porcelain bonded to precious metal: this is what most crowns are made from. A precious metal base is made and then porcelain is applied in layers over it. Porcelain: these crowns are made entirely out of porcelain and are not as strong as bonded crowns.
Some crowns are made entirely out of metal. The classic metallic crown is one made out of gold, or more precisely, a gold alloy. Actually, there are a number of different types of dental alloys that can be used for crown fabrication. Some of these metals are silver (white) in color, rather than yellow like gold. Dentists have been placing all-metal crowns for over 100 years, the longest of any type by far.