High aesthetic effect, good transparency, natural tooth color. High strength, hardness and durable, do not need the support of metal. Excellent biological compatibility, no metal odor, no black color, and no corrosion, anti allergy, protect the gums and avoid bleeding. Isostatically pressed, ensures all parts have a homogenous density and shrinkage distribution. Discs have the edge groves required for a milling machine. More accurate scaling factor (the persistent and consistency of scaling factor between each batch). Reliable, controllable, reusable production process to make sure the same quality. Easy to cut, no porcelain breakage, less scraps.