Gold crowns are one of the classic types of dental crowns used in dentistry and there are two types. The full gold crown is made entirely of gold or a gold alloy. Another type is porcelain fused to a metal crown (PFM), made from a combination of gold and porcelain.
Porcelain fused to metal crowns (or PFM crowns) can be referred to as full-cast crowns which has porcelain fused on most or all parts of the tooth. They are a hybrid between porcelain and metal crowns. The entire crown has a metal layer underlying and porcelain / ceramic on top of it.