Fracture of Reduced-Diameter Zirconia Dental Implants Following Repeated Insertion.

Purpose: Achievement of high insertion torque values indicating good primary stability is a goal during dental implant placement. The objective of this study was to evaluate whether or not two-piece implants made from zirconia ceramic may be damaged as a result of torque application.

Materials And Methods: A total of 10 two-piece zirconia implants were repeatedly inserted into polyurethane foam material with increasing density and decreasing osteotomy size.

Screw Joint Stability in Conventional and Abutment-Free Implant-Supported Fixed Restorations.

Purpose: Procera Implant Bridges (PIBs) do not engage supporting implant shoulders and are fixed using comparably long retention screws. The aim of this in vitro clinical study was to determine the detorque values in PIBs and conventionally fabricated fixed dental prostheses (FDPs).

Materials And Methods: Two groups of screw-retained implant-supported three-unit FDPs (n=10) were fabricated by means of conventional casting or computer-aided design/computer-assisted manufacture to fit an in vitro situation with two implants.