Rotational Load Fatigue Performance of a One-Size Implant-Abutment Connection System.

This article investigates the rotational load fatigue performance of different implant diameters and abutment platforms within a one-size implant-abutment (OSIA) connection system, specifically the Straumann BLX implant. Four groups combining narrow-, regular-, and wide-diameter implants with either regular base/wide base (RB/WB) or wide base (WB) abutments were tested under cyclic loading until failure or a 5 million cycle cutoff. Results showed that wide-diameter implants (WDIs) with WB abutments exhibited significantly superior fatigue resistance, surviving the full test without failure, whereas all implants with RB/WB abutments failed regardless of diameter. Implant diameter did not significantly affect fatigue life with RB/WB abutments, but larger diameters led to less catastrophic, more coronal failure modes, potentially facilitating clinical management. The study concludes that for high mechanical risk scenarios, WB abutments are preferable with WDIs, while the one-size OSIA connection limits fatigue performance improvements from increasing implant diameter, highlighting the need for careful clinical selection of implant-abutment configurations.