The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Rotational tolerances of a titanium abutment in the as-received condition and after screw tightening in a conical implant connection

  • Prisco, Rosario (Department of Clinical and Experimental Medicine, University of Foggia) ;
  • Troiano, Giuseppe (Department of Clinical and Experimental Medicine, University of Foggia) ;
  • Laino, Luigi (Multidisciplinary Department of Medical-Surgical and Dental Specialties, University of Campania - Luigi Vanvitelli) ;
  • Zhurakivska, Khrystyna (Department of Clinical and Experimental Medicine, University of Foggia)
  • Received : 2021.09.10
  • Accepted : 2021.11.23
  • Published : 2021.12.31
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Abstract

PURPOSE. The success of an implant-prosthetic rehabilitation is influenced by good implant health and an excellent implant-prosthetic coupling. The stability of implant-prosthetic connection is influenced by the rotational tolerance between anti-rotational features on the implant and those on the prosthetic component. The aim of this study is to investigate the rotational tolerance of a conical connection implant system and its titanium abutment counterpart, in various conditions. MATERIAL AND METHODS. 10 preparable titanium abutments, having zero-degree angulation (MegaGen, Daegu, Korea) with an internal 5-degree conical connection, and 10 implants (MegaGen, Daegu, Korea) were used. Rotational tolerance between the connection of implant and titanium abutments was measured through the use of a tridimensional optics measuring system (Quick Scope QS250Z, Mitutoyo, Kawasaki, Japan) in the as-received condition (Time 0), after securing with a titanium screw tightening at 35 Ncm (Time 1), after tightening 4 times at 35 Ncm (Time 2), after tightening one more time at 45 Ncm (Time 3), and after tightening another 4 times at 45 Ncm (Time 4). RESULTS. The group "Time 0" had the lowest values of rotational freedom (0.22 ± 0.76 degrees), followed by the group Time 1 (0.46 ± 0.83 degrees), the group Time 2 (1.01 ± 0.20 degrees), the group Time 3 (1.30 ± 0.85 degrees), and the group Time 4 (1.49 ± 0.17 degrees). CONCLUSION. The rotational tolerance of a conical connection is low in the "as received" condition but increases with repetitive tightening and with application of a torque greater than 35 Ncm.

Keywords

Acknowledgement

We would like to cite the memory of our colleauge Dr. Paolo Vigolo, with acknowledgments for his intellectual heritage in field of prosthetic dentistry. We gratefully acknowledge MegaGen, Daegu, Korea for providing titanium abutments and implants for experiments.

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