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Purpose: The purpose of this study was to evaluate the size of possible vertical microgaps and torque loss of two different-attachment-systems in mandibular Implant-Retained-Overdentures. Materials and Methods: Two lab models with two parallel Straumann fixtures (at a 22 mm distance) were prepared. Straumann and Rhein 83 SRL balls and sockets (n=5) were used. All the samples were inserted in the artificial saliva. The samples were subject to fatigue test in Zwick/ROELL Zwickline machine (Z010 Germany) before and after 1100, 2200, 3300, and 5500 cycles under a 50 newton Load cell (51mm/min). At the end of each cycle the size of vertical microgaps at the implant-abutment-interface were recorded at four sites with a stereomicroscope (Olympus Japan, SZX_19, x200) by two experts. Torque loss was recorded before and after cyclic dislodgement of the ball attachments using a torque meter ((LT, Lutron TQ, 8800). Results: Rhein ball abutments showed more vertical microgap than Straumann ball abutments (p<0.001). After cyclic loading, the percentage of torque loss in Straumann ball abutments was significantly lower than that of Rhein ball abutments (p=0.001). Conclusion: Despite the limitations of this in-vitro study, the vertical microgap and torque loss were significantly higher in Rhein system than those of Straumann system. Of course, both systems showed an acceptable size of vertical microgaps after all fatigue-test-cycles.

Comparative Evaluation of Vertical Microgaps and Torque Loss in Two Ball-Attachment-Systems of Mandibular Implant-Retained-Overdentures