Nonrotational capability is recommended for multiple-implant supported prostheses, as well as single-tooth restorations. Interlocking interfaces facilitate the fabrication of custom re-angulated abuments when required, provides built-in troubleshooting redundancy in the event of implant loss, and helps reduce torque on retaining screws. The path of insertion can be established in the laboratory with a verification jig and any interferences adjusted or reangulated, or a standard gold cylinder substituted with compatible armamentarium. Brånemark nonrotational abutments can be used in place of standard abutments for all multiple-implant-supported prostheses, regardless of position or orientation. When required, a standard gold cylinder can be used with the Brånemark nonrotational abutment. Specialized abutments, such as the Estheticone, can also utilize nonrotational conical cylinders to reduce torque on the gold retaining screws.
Keywords: abutment reangulation, male-female interlocking interface, nonrotational configuration, nonrotational redundant capability, preloaded interface, systems interchangeability