Para. 1 - The Relationship Between Special and Regular School Programs. Special education is an integral part of the total educational enterprise, not a separate order. In any school system, special education is a means of enlarging the capacity of the system to serve the educational needs of all children.
The purity of dental gold is usually 16 karat, but it is slightly more complicated to recycle than jewelry because it may include nonmetal content like tooth enamel or porcelain. The recycler will use a process like acid reduction or reverse electroplating to extract the gold from the nonmetal elements.
Dentists have used gold for filling cavities (before mercury amalgam became available), for crowns, and for other purposes since ancient times. Gold is malleable, nearly immune to corrosion, and hard enough to form a biting surface that can be used for years. Gold was used before silver became available and has continued to be used for specialized purposes. Dental restorations are often made from a combination of precious metals.