Fixed partial dentures (FPD)
Crown is a type of FPD that covers prepared axial surfaces of the tooth and is bonded to the tooth by using dental cement. It is used where there are extensive areas of defective axial tooth structure, or if there is need to modify contours to refine occlusion or improve esthetics. There are many different methods of crown fabrication, each using a different material: metal-ceramic crowns, all ceramic crowns, acrylic crowns. Porcelain-fused-to-metal crowns (PFMs, metal ceramic crowns) have a metal frame that provides strong compression and tensile strength, and the porcelain gives the crown a white tooth-like appearance. Optical properties of metal free restorations ( all ceramic crowns) can reproduce even more natural aesthetics . Acrylic crowns are used as temporary restorations.
Bridge -Conventional tooth supported fixed partial denture
A bridge is a type of FPD, that is used to replace a missing tooth by joining permanently to adjacent teeth, remaining roots or dental implants. When restoring an edentulous space with a bridge, it will crown the teeth adjacent to the space and bridge the gap with a pontic.