Mechanical Testing of Superstructures on the CeraOne Abutment in the Brånemark System

Metal-ceramic, all-ceramic, and porcelain crowns, as well as complete implant posts and alumina copings alone, were loaded in an Instron universal testing machine. Load was applied until fracture or major deformation of tested objects was observed. Based on these results, theoretical calculations were made for different clinical situations. The maximum load that the single crown could resist without giving rise to any damage on the superstructure was calculated. The conclusion was that the abutment screw is the weakest link, since the failure loads of the gold screws are lower than the failure loads of the crowns, with the exception of porcelain crowns. Keywords: alumina, bending moment, ceramic crown, occlusal force, single-tooth implant