Article:

Precise fit between dental implants and the superstructure is important for the long term success of implants and implant-supported prostheses. One factor which may influence the accuracy of the definitive prosthesis is the stability of the impression coping in polymerized impression material. In some circumstances, an implant must be placed well below the gingival margin, meaning that most of the impression coping will also be situated subgingivally with no contact with the impression material. This can result in reduced stability of the impression coping, allowing it to rotate when fastening the implant analog. This article describes a simple technique that involves the use of a roll of composite resin, tray adhesive, and a small amount of occlusal registration material applied around a transfer coping in a direct implant impression.