According to the different production materials, all-ceramic teeth can be divided into: 1. Glass-ceramic all-ceramic teeth. Such as: hot die-cast porcelain crown (Empress I, II, III generation), glass penetration porcelain crown, and glass ceramic crown grinding by CAD/CAM technology. 2. Alumina and zirconia all-ceramic teeth, the inner crown of alumina and zirconia is completed by grinding by applying CAD/CAM technology, and then the outer layer of porcelain is added through layered porcelain stacking technology to make the finished all-porcelain tooth or the all-zirconium crown without the outer layer of porcelain.