Currently, commonly used restorative dental materials can be divided into three major categories: metal, dental composite resin, and ceramic materials. Each category includes several kinds of materials. The chemical composition of composite resins is basically the same, all are based on diacrylic resin with different ingredients to complete, and the chemical composition of different brands of composite resins is similar. Ceramic materials commonly used are feldspar ceramics, alumina ceramics and zirconia ceramics. Simply put, metal is relatively low in price, high in strength, strong, long in clinical use, and simple in process, but metal has many disadvantages, such as being unsightly, corrosive, affecting magnetic resonance imaging, and some people are allergic to it. Because they are not aesthetically pleasing, all-metal crowns are generally used only for posterior teeth, because these teeth are not visible when speaking or smiling. Composite resins are similar in color to the teeth and are biocompatible, while not having the brittleness of ceramic materials. However, composite resin is a polymer material, the color is unstable and will age over time, staining or discoloration will occur, and in addition it is not resistant to wear and tear. At present, in restorative dentistry clinic, multi-layer colored resin artificial teeth for movable denture is the main application form of resin material, which is manufactured by high temperature and pressure, with beautiful color and wear resistance. Ceramic materials have good aesthetics, high gloss, stable chemical properties, wear resistance and high hardness, and are currently the most widely used restorative materials for all parts of the oral cavity. The biggest disadvantage of ceramic materials is that they are brittle and cannot bite hard objects.