Clinical evidence and Science 21 Load bearing capacity of implant-abutment connections The design of the implant-abutment connection is of high relevance for the loading capacity as well as for the long-term stability of the peri-implant hard and soft tissues. The following studies give deeper insight into loading capacity of the implant systems. Static resistance of Tube-in-Tube® connection A research group from Hannover, Germany (Dittmer et al., 2011), compared different implant systems in an experimental study (10). On implants, centrally embedded in plastic material, corresponding abutments were placed and tightened with screws according to the manufacturers’ recommendations. A universal testing machine was used to apply a 30° off-axis load linearly increasing until failure. Although all tested implants displayed load-bearing capacities that were considerably higher than average chewing forces, the authors could clearly demonstrate that the connection design had a significant influence on the load-bearing capacity as well as on the failure mode due to static overload. The CAMLOG® SCREWLINE implants with Universal abutments demonstrated favorable results regarding their load-bearing capacity (Fig. 15). Fig. 15_Load-bearing capacity (Fm) versus implant-abutment connection type. Means and standard deviations are given. AST – Astra Tech, BEG – Bego, CAM – CAMLOG®, FRI – Friadent, NOB – Nobel, STR – Straumann (adapted from Dittmer et al. 2011) 1400 0 200 400 600 800 1000 1200 Load bearing capacity Fm [N] AST 768 BEG 1129 CAM 999 FRI 624 NOB 944 STR 606 SCIENCE BEHIND THE IMPLANT-ABUTMENT CONNECTIONS
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