Fixed denture restoration is not permanent and requires regular review and maintenance. There may be the following aspects of the problem: 1, fixed denture itself: before may be porcelain restorations or metal fixed bridge, now is zirconia, all-porcelain bridge, may appear collapse porcelain, connector fracture or some other problems, simple restoration problems replacement is relatively simple, can be directly to the restoration after removal of the fixed denture; 2, abutment teeth problems: abutment teeth problems are relatively Trouble, there may be dental, dental pulp or periodontal problems. Dental or endodontic problems can be treated by perfect dental endodontic treatment and then re-made fixed denture. Periodontal problems are more complicated than dental or endodontic problems, such as alveolar bone resorption exceeding 1/2 of the root length, and the adjacent teeth in the missing space cannot support fixed denture restoration, so you must choose to increase the number of abutment teeth to redo the fixed denture.