Dynamic fatigue resistance of implantÇƒÏabutment junction in an internally notched morse-taper oral implant: influence of abutment design

Dynamic fatigue resistance of implantÇƒÏabutment junction in an internally notched morse-taper oral implant: influence of abutment design
August 2004
?·ehreli MC, Ak??a K, Idotplik??iogbrevelu H, Scedilahin S.
Clinical Oral Implants Research, August 2004, vol. 15, no. 4, pp. 459-465(7)
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Abstract:
Purpose: To compare dynamic fatigue resistance of one- and two-piece abutments connected to internally notched morse-taper oral implants.
Material and methods: Sixteen synOcta¨? ITI¨? implants were tightened into two metal models. SynOcta¨? abutments for cement-retained restorations and solid abutments were divided into two equal groups and were torque-tightened into the implants. Each implant received a cement-retained crown. Cyclic dynamic axial and lateral peak loads of 75¨±5 N were applied on the implants for a duty of 500,000 cycles at 0.5 Hz, and at an angle of 20¨?. Prior to the experiments and at each 100,000 cycles of loading, periotest values (PTVs) were measured. Removal torque values (RTVs) of the abutments were also measured with a custom-made torque device at the termination of the experiment.
Results: All abutments and implants were clinically immobile and without any signs of mechanical failure. The final PTVs for both abutments were similar and the difference between groups was insignificant (P>0.05). The RTVs of solid abutments were significantly higher than synOcta¨? abutments (P<0.05).
Conclusion: Predictable long-term clinical results can be achieved with solid abutments and synOcta¨? abutments for cement-retained restorations. Solid abutments possess higher removal torque resistance than synOcta¨? abutments when connected to synOcta¨? ITI¨? implants.