Precious metal alloy porcelain  crown:the use of  precious metal production metal base crown PFM crown known as the noble metal porcelain crown. The precious metal has good chemical inertness makes it has antioxidant and anti corrosion ability .Dental  most used in  the precious metals including:gold,platinum,palladium.

Porcelain teeth can be characterized restorative tooth morphology and function,bending force is powerful and color, realistic  appearance ,smooth surface,strong wear resistance  and no  deformation,color stability ,successful  restoration should be realistic  shape ,color  stability, acid and alkali,is a permanent prosthesis.