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Title: Load fatigue performance of four implant-abutment interface designs: Effect of torque level and implant system
Authors: Quek, H.C.
Tan, K.B. 
Nicholls, J.I.
Keywords: Abutment screw failure
Implant-abutment interface
Load fatigue
Issue Date: 2008
Citation: Quek, H.C.,Tan, K.B.,Nicholls, J.I. (2008). Load fatigue performance of four implant-abutment interface designs: Effect of torque level and implant system. International Journal of Oral and Maxillofacial Implants 23 (2) : 253-262. ScholarBank@NUS Repository.
Abstract: Purpose: Biomechanical load-fatigue performance data on single-tooth implant systems with different implant-abutment interface designs is lacking in the literature. This study evaluated the load fatigue performance of 4 implant-abutment interface designs (Brånemark-CeraOne; 3i Osseotite-STA abutment; Replace Select-Easy abutment; and Lifecore Stage-1-COC abutment system). The number of load cycles to fatigue failure of 4 implant-abutment designs was tested with a custom rotational load fatigue machine. The effect of increasing and decreasing the tightening torque by 20% respectively on the load fatigue performance was also investigated. Materials and Methods: Three different tightening torque levels (recommended torque, -20% recommended torque, +20% recommended torque) were applied to the 4 implant systems. There were 12 test groups with 5 samples in each group. The rotational load fatigue machine subjected specimens to a sinusoidally applied 35 Ncm bending moment at a test frequency of 14 Hz. The number of cycles to failure was recorded. A cutoff of 5 × 106 cycles was applied as an upper limit. Results: There were 2 implant failures and 1 abutment screw failure in the Brånemark group. Five abutment screw failures and 4 implant failures was recorded for the 3i system. The Replace Select system had 1 implant failure. Five cone screw failures were noted for the Lifecore system. Analysis of variance revealed no statistically significant difference in load cycles to failure for the 4 different implant-abutment systems torqued at recommended torque level. A statistically significant difference was found between the -20% torque group and the +20% torque group (P < .05) for the 3i system. Conclusions: Load fatigue performance and failure location is system specific and related to the design characteristics of the implant-abutment combination. It appeared that if the implant-abutment interface was maintained, load fatigue failure would occur at the weakest point of the implant. It is important to use the torque level recommended by the manufacturer.
Source Title: International Journal of Oral and Maxillofacial Implants
ISSN: 08822786
Appears in Collections:Staff Publications

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