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Related Concept Videos

Torque Free Motion01:15

Torque Free Motion

The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
Net Torque Calculations01:19

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 rotate...
Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
Next, use bending moment diagrams for the shaft to...
Design of Transmission Shafts01:16

Design of Transmission Shafts

The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by reconfiguring the...
Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque exerted...
Torque01:10

Torque

Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...

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Related Experiment Video

Updated: May 12, 2026

Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires
08:46

Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires

Published on: July 24, 2018

Selecting custom torque prescriptions for the straight-wire appliance.

Earl Johnson1

  • 1Division of Orthodontics, Department of Orofacial Sciences, School of Dentistry, University of California, San Francisco, CA 94143-0438, USA. earl.johnson@ucsf.edu

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|April 2, 2013
PubMed
Summary

Custom torque prescriptions in orthodontics reduce archwire adjustments and speed correction, shortening overall treatment time. This approach minimizes iatrogenic issues and allows earlier corrections with modern wires.

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Area of Science:

  • Orthodontics
  • Biomaterials Science

Background:

  • Orthodontic treatment often requires routine archwire torque adjustments.
  • Iatrogenic torque problems can arise from improper adjustments.
  • Current materials offer improved resilience for earlier interventions.

Purpose of the Study:

  • To evaluate the impact of custom torque prescriptions on orthodontic treatment efficiency.
  • To determine if tailored torque reduces the need for manual adjustments.
  • To assess the role of advanced wire materials in torque correction.

Main Methods:

  • Analysis of treatment protocols involving custom torque prescriptions.
  • Comparison of adjustment frequency between standard and custom torque groups.
  • Evaluation of torque correction timing using nickel-titanium and beta-titanium wires.

Main Results:

  • Custom torque prescriptions significantly decrease routine archwire torque adjustments.
  • Torque correction is accelerated, leading to reduced overall treatment duration.
  • Earlier torque corrections are feasible with resilient nickel-titanium and beta-titanium wires.

Conclusions:

  • Tailored torque prescriptions optimize orthodontic treatment by minimizing adjustments.
  • The use of appropriate torque reduces treatment time and prevents iatrogenic complications.
  • Advanced wire materials facilitate earlier and more efficient torque correction.