A bridge may be used to replace a single tooth.  A bridge consists of both a false tooth, called a pontic, and the anchors (abutment crowns) that support the pontic.  The entire structure spans the space vacated by the missing tooth. Neighboring tooth structure is removed shaping them to receive an anchor crown.  An impression is then taken and sent to a dental lab where they fabricate the bridge.  The structure part of the bridge is created with a strong metal alloy that can handle the anticipated stresses.  Tooth-like porcelain is then fused to the structure.  Once the bridge is tested for a correct fit, the anchor crowns are cemented to the neighboring teeth.