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Related Experiment Videos

Providing optimum torque to implant prostheses: a pilot study

M J Jaarda1, M E Razzoog, D G Gratton

  • 1Department of Prosthodontics, University of Michigan, School of Dentistry, Ann Arbor 48109-1078.

Implant Dentistry
|January 1, 1993
PubMed
Summary

Operator experience and screwdriver length significantly impact torque applied to implant gold screws. Longer screwdrivers generated more torque, while less experienced dentists applied less, highlighting the need for standardized protocols in dental implant procedures.

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Area of Science:

  • Dental Implantology
  • Biomaterials Science
  • Prosthodontics

Background:

  • Optimal torque (10 N/cm) is crucial for tightening implant retaining gold screws to prevent loosening and fracture.
  • Variability in torque application can compromise implant stability and longevity.

Purpose of the Study:

  • To investigate how instrumentation (screwdriver length) and operator experience affect torque during manual tightening of dental implant screws.
  • To identify factors influencing the achievement of optimal preload for implant components.

Main Methods:

  • Sixteen subjects were divided into four experience-based groups.
  • Subjects manually tightened screws into implant analogs using 20-mm and 37-mm slotted screwdrivers.
  • Torque generated during screw tightening was measured using a torque gauge upon removal.

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Main Results:

  • Significantly greater torque was achieved using the 37-mm screwdriver compared to the 20-mm version across all groups.
  • Operators with no prior implant experience generated significantly less torque than more experienced groups.
  • Inconsistent torque values were observed among all participants, with none achieving consistently optimal levels.

Conclusions:

  • Screwdriver length and operator experience are critical variables in achieving appropriate torque for dental implant screws.
  • Less experienced operators may under-torque, while experienced operators may over-torque screws, necessitating further training or standardized instrumentation.
  • The lack of consistent torque application underscores a potential risk factor in implant dentistry that requires attention.