Braces worn for fillings can be replaced, provided that the abutment teeth below the crown are not extracted due to disease. The braces referred to in everyday life are denture crowns, which are mainly used for the restoration of dental defects and tooth defects. Single-crown restorations are mainly used for teeth with large defects or teeth after root canal treatment. When a patient is missing a tooth in the mouth, part of the teeth on both sides are often ground out and then three dentures are placed to restore the missing tooth. The clinical life of a denture crown is currently about 10 years, and over time the gums will recede causing the crown edge to be exposed and affecting the aesthetics. Some patients will also have food embedding resulting in pulpitis and other diseases in the abutment teeth below the crown, so the crown will often be removed when it reaches a certain age or disease. If the abutment teeth underneath are intact, a new crown can be made by reshaping the teeth underneath and then taking a model. If the abutment teeth have pulpitis or periapical disease, most can be treated with root canal therapy to eliminate the inflammation, and then a new crown can be fabricated. If the abutment teeth are extracted due to excessive decay, a new restoration should be selected based on the condition of the remaining teeth in the mouth.