RHEIN 83 was born in Bologna in 1983 and is the elastic attachment world leader for removable dentures. The production started with the spherical castable attachment with various retentions that today is the most used in the world. The attachments family grew with the innovative OT EQUATOR, the smallest and most stable attachment of the market. The RHEIN 83 Research Department is always attentive to dentists and dental technicians needs. In recent years RHEIN 83 developed two lines of products: the implant line and the CAD CAM line. All the abutments are available for all implant brands with various cuff heights. The trade mark OT EQUATOR is the smallest and most stable attachment of the market. Some of the most important implant manufacturers included OT EQUATOR in their catalog. The Research Department recently produced an effective and unique solution: the SMARTBOX that corrects the divergency betweeen implants up to 50°. The CAD CAM line is available in the most important software houses and the threaded spheres allow to build a reliable retention for bars overdentures in absolute safety being able, if needed, to be easely replaced. Nevereless all prefabricated attachments by RHEIN 83 undergo a TIN treatment that enhances their hardness and their wear resistance.