Diastema preservation in resin-bonded fixed partial dentures.

The etched-metal, resin-bonded fixed partial denture has evolved rapidly from its origination as an extracoronal splint. Technologic advancements in both resin chemistry and retentive surface etching techniques have markedly improved the quality of the prosthesis. Today, resin-bonded fixed partial dentures are an effective, conservative means of replacing missing teeth when specific contra-indications--long spans, insufficient sound enamel, malocclusion, pathologic occlusal habits--are identified and avoided. A universally-accepted standard preparation does not exist for resin-bonded fixed partial dentures; rather, common principles of tooth reduction are agreed upon by most authors. This case report details necessary modifications in typical preparation and framework design that must be included to maintain a midline diastema when such spacing is required or preferred by the patient.