PFM in prosthodontics means porcelain fused to metal, also known as metal porcelain full crown. It is a restoration made of low-melting porcelain and metal base material, and it has the strength of metal. He porcelain is beautiful, and can better restore the shape and function of the tooth. It is a permanent restoration with high strength, lifelike appearance, stable color, smooth surface, not easy to wear, acid and alkali resistance, and good biocompatibility.