J Adv Prosthodont.  2021 Jun;13(3):136-143. 10.4047/jap.2021.13.3.136.

Effect of repeated use of an implant handpiece on an output torque: An in-vitro study

Affiliations
  • 1Department of Dental Science, Graduate School, Kyungpook National University, Daegu, Republic of Korea
  • 2Advanced Dental Device Development Institute (A3DI), Kyungpook National University, Daegu, Republic of Korea
  • 3Department of Periodontology, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea
  • 4Department of Orthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea
  • 5Department of Oral & Maxillofacial Surgery, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea
  • 6Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea

Abstract

Purpose
This study aimed to evaluate the effect of repeated use of an implant handpiece under an implant placement torque (35 Ncm) and overloading torque condition (50 Ncm) on an output torque.
Materials and Methods
Two types of implant handpiece systems (Surgicpro/X-DSG20L [NSK, Kanuma, Japan] and SIP20/CRB46LN [SAESHIN, Daegu, South Korea]) were used. The output torque was measured using a digital torque gauge. The height and angle (x, y, and z axes) of the digital torque gauge and implant handpiece were adjusted through a jig for passive connection. The experiment was conducted under the setting torque value of 35 Ncm (implant placement torque) and 50 Ncm (overloading torque condition) and 30 times per set; a total of 5 sets were performed (N = 150). For statistical analysis, the difference between the groups was analyzed using the Mann–Whitney U test and the Friedman test was used to confirm the change in output torque (α=.05).
Results
NSK and SAESHIN implant handpieces showed significant differences in output torque results at the setting torques of 35 Ncm and 50 Ncm (P <.001). The type of implant handpiece and repeated use influenced the output torque (P <.001).
Conclusion
. There may be a difference between the setting torque and actual output torque due to repeated use, and the implant handpiece should be managed and repaired during long-term use. In addition, for successful implant results in dental clinics, the output torque of the implant handpiece system should be checked before implant placement.

Keyword

Dental implants; Repeated use; Output torque; Implant handpiece
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