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Net Torque Calculations

Net Torque Calculations

When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...

Screw: Problem Solving

Screw: Problem Solving

In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...

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Related Experiment Video

Updated: Jul 14, 2025

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

Published on: February 10, 2014

Implant abutment using hand drivers versus torque wrench.

Himani Singh¹, Subhash Sonkesriya², Bhumika J Patel³

¹Department of Oral Medicine and Radiology, Kothiwal Dental College and Research Centre, Moradabad, Uttar Pradesh, India.

|October 10, 2023

Summary

This summary is machine-generated.

Manual screwdrivers have high torque error rates, unlike torque wrenches. Mechanical torque restricting instruments are recommended for consistent torque application in dental implant procedures to avoid variations and ensure precision.

Keywords:

Dental implants abutment screw hand drivers internal thread torque wrench

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Last Updated: Jul 14, 2025

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Published on: September 13, 2022

Area of Science:

Dental Implantology
Biomaterials Engineering
Mechanical Engineering

Background:

Manual screwdrivers exhibit significant torque variability (15-48% error).
Achieving precise torque is crucial for dental implant stability and longevity.
Mechanical torque restricting devices offer consistent torque application.

Purpose of the Study:

To evaluate torque differences between handheld drivers and torque wrenches.
To assess the impact of these torque differences on internal implant threads.

Main Methods:

120 acrylic blocks with dental implant analogs were prepared.
Specimens were divided into manual torque and torque wrench groups (60 each).
Stereomicroscopy and Biowizard software analyzed internal thread architecture and separation.

Main Results:

Manual torque application showed a mean torque of 33.6 ± 6.510 Ncm with operator variance.
Torque wrench application yielded a mean torque of 33.57 ± 3.472 Ncm.
Neither method caused significant modifications or deformation to internal implant threads.

Conclusions:

Manual torque application results in inconsistent torque values due to operator skill variability.
Torque wrenches provide accurate torque within manufacturer-specified ranges.
Mechanical torque restricting instruments are recommended for precise and reliable torque application in dental implant procedures.