At present, implant materials are divided into the following categories: 1, metal: the earliest and still widely used material. 2. Ceramics: good biocompatibility, color and luster are close to natural teeth, but poor mechanical strength, brittleness, and bad processing. 3, carbon materials: good chemical and biological stability, but poor mechanical properties, brittle, easy to break. 4.Polymer material: it is no longer used as implant material. 5.Composite materials: At present, composite materials are mainly used for coating technology to compound bioactive materials on the surface of metal materials to make up for the shortcomings of the respective materials, so that the new materials formed are idealized.