Newer bridges are now available which are made of composite resins with fiberglass substructures, high strength ceramics and hybrid materials. Each of these materials has a time and place and if used selectively can have wonderful results. The main problem with non-metal fixed bridges has been their fracture resistance is poor compared to porcelain fused to metal.
Another type of fixed bridge does not rely upon the abutments prepared for crowns for retention, but rather relies upon bonding materials for retention. These are called adhesive bridges or “Maryland Bridges” Originally Maryland bridges were porcelain fused to metal prostheses which were bonded to the backs of the adjacent teeth after minor tooth preparation was completed.