18 Clinical evidence and Science Fig. 12_Rotational displacement of six implant systems showing the lowest rotational freedom with the CONELOG® connection (adapted from Semper Hogg et al. 2015) 7 0 1 2 3 4 5 6 Rotation in º CONELOG® Nobel Active Ankylos C/X Astra Tech Straumann Tissue Level Straumann Bone Level KEY TAKE OUTS: STABILITY OF IMPLANT-ABUTMENT CONNECTIONS Stability of the implant-abutment connection is strongly influenced by the precision of fit, the connection design and manufacturing precision. Several research groups analyzed and compared the stability of different implant-abutment connections. The CAMLOG® Tube-in-Tube® connection with its cam-groove index design showed favorable results in these analyses with regard to precision in reproducing the abutment position and rotational fit. Although conical connections may have design-related disadvantages regarding precision of fit (vertical displacement), the CONELOG® implant-abutment connection demonstrated evidence of high-precision manufacturing and superior positional stability when compared to other conical connections. Additionally, the “vertical fit feature” of the system definitely ease the clinical handling of the connection: the impression post is not in contact with the cone during impression taking. The vertical discrepancies – inherent to all conical connections – are reduced by this concept (Fig. 13). Fig. 13_«Vertical fit feature»: no contact of impression post and the cone during impression taking SCIENCE BEHIND THE IMPLANT-ABUTMENT CONNECTIONS
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