The so-called fixed bridge restoration refers to the restoration of a single missing tooth by means of a fixed joint crown. The specific restoration method is to remove one layer of crowns from each side of the gap, and then choose a crown bridge with three consecutive crowns together to repair the gap. This restoration is a common restoration method for fixed restorations. The advantage of this method is that it can be applied to the corresponding tooth, unlike the movable denture which needs to be removed every day, and has a better bite function, but it can cause more damage to the two adjacent teeth.