At present, porcelain teeth are mainly divided into two categories, including metal porcelain and non-metal porcelain. Metal porcelain and according to the material selection of cobalt-chromium alloy porcelain and pure titanium alloy porcelain, metal porcelain teeth with a metal base crown, on the basis of the metal base crown, the outer layer of 3-4 layers of porcelain, restore the shape of the tooth and chewing function, because of the presence of metal, can be a certain irritation to the tooth, periodontal, affecting the aesthetics, color, permeability. Non-metallic porcelain, that is, all-porcelain crowns, no metal base crown as a backing, all using zirconia porcelain for production, zirconia as the base crown and metal base crown, very high strength, the outer layer and then wrapped porcelain, to ensure that the teeth chewing function, strength, aesthetics and comfort, the key is to ensure biological safety, periodontal, dental body without irritation.