Full crowns, also known as crowns or braces, are a very common restoration used in restorative clinics. It can be used to improve the color and shape of a tooth, to protect a weak tooth from splitting, and as a retainer for a fixed denture. A variety of materials are available for full crowns to meet different clinical treatment requirements. All-metal crowns: are made of cast metal, currently we are using nickel-chromium alloy and gold alloy. Gold alloys are mainly composed of gold, with palladium, platinum and other metals added to form an alloy. The gold content of different brands of dental alloys may vary slightly, but the performance will meet the clinical requirements, including biocompatibility, casting accuracy, mechanical properties, etc. Compared with nickel-chromium alloy, gold alloy has many advantages: high casting accuracy, good biocompatibility, moderate hardness, and will not cause undesirable abrasion to the opposing teeth. If you are doing a full crown of a posterior tooth and your aesthetic requirements are not too high, a gold alloy full crown is a very suitable choice. However, the price of gold alloy is higher than that of nickel-chromium alloy. However, with the economic development of our country, the percentage of patients choosing gold alloy is increasing.