The O-SO attachment system is a proven retentive system that features a simple design that reduces shock, pressure, torque, and wear on abutment teeth. The O-SO secret lies in an easily replaceable rubber O-Ring. It is a tissue resilient attachment with vertical and hinge stress-breaking action. Characteristics The O-SO male is a plastic pattern that is incorporated into the wax pattern for a post and root cap coping. It can be cast in any hard dental alloy. Once completed, it is cemented into the root prep and provides the retention for the denture. By maintaining the patient's natural teeth roots, ridge resorption is slowed. The O-SO female component consists of a rubber O-Ring that is held into the denture base acrylic by a gold-plated metal ring. This allows for ease in replacement of the rubber O-Rings. Simply pry the worn rubber ring out of its metal housing and pop a new one in. It's that easy. The O-SO attachment system will make the dentist's work easier while increasing the benefits to the patient.