Introduction. Statement of proposition: magnetic retention may be a good method of attaching overdentures. It is therefore necessary to select the retentive capabilities of magnetic systems to ensure their effective performance. Aim. The purpose of this study was to evaluate the actual attractive force of different magnetic attachments. Material and Methods. The magnetic attachments used in this study were the Magfit DX400, Magfit DX600, Magfit DX800 and Magfir DX1000 (Aichi, Japan). Magnets and keepers were embedded in the centre of acrylic resin blocks which, according to the manufacturer, have no effect on the force delivered by the magnet. The attractive forces were measured using a universal testing machine at a crosshead speed of 50mm/min. This separation approximated the speed of movement of the mandible away from the denture and its magnets during functional movements. Conclusions. All the components obtained for examination showed a statistical conformity to specification and mutual compatibility. Rare earth magnets can be satisfactorily used in prosthodontics due to of their many advantages.

Key words: overdentures, magnets, attractive force.