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Clinician-generated torque on abutment screws using different hand screwdrivers.

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The type of hand screwdriver and implant location significantly impact prosthetic screw torque. Larger screwdrivers and anterior implant placement generated higher torque in this in vitro study.

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Area of Science:

  • Dental Implantology
  • Prosthodontics
  • Biomechanical Engineering

Background:

  • Clinicians commonly use hand screwdrivers for prosthetic and abutment screws.
  • The influence of screwdriver type, implant location, and practitioner's sex on generated torque is not well-established.

Purpose of the Study:

  • To compare torque generated by different hand screwdrivers in anterior vs. posterior implant regions.
  • To assess the correlation between applied torque and practitioner's sex and body mass index (BMI).

Main Methods:

  • Fifty clinicians used three types of hand screwdrivers (small, medium, large) on anterior and posterior implants in a typodont.
  • Torque values were measured using torque meters; clinician's sex, age, height, and weight were recorded.
  • Generalized linear models analyzed correlations between factors and generated torque (α=.05).

Main Results:

  • Significant differences in applied torque were found based on screwdriver type (P<.001).
  • Higher torque values were generated in the anterior region compared to the posterior region (P<.001).
  • The interaction between practitioner's sex and BMI significantly influenced generated torque (P=.044).

Conclusions:

  • Screwdriver type and implant location are critical factors affecting generated torque.
  • Large-handled screwdrivers produced higher torque than small and medium ones.
  • Anterior implant regions consistently received higher torque application.