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Angle of Twist: Problem Solving01:13

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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...
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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.
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Updated: Sep 2, 2025

Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment
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Inclinometer: A new device for measuring intermolar torque and angle.

Ahmad Behroozian1, Les Kalman2, Milad Hemmatiyan3

  • 1Department of Orthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.

Journal of Advanced Periodontology & Implant Dentistry
|August 3, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a new, low-cost device for measuring intermolar torque in posterior teeth. The simple appliance offers a valid and rapid method for assessing torque, crucial for dental esthetics and occlusion.

Keywords:
Appliancemeasuremolartorque

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Area of Science:

  • Dentistry
  • Orthodontics
  • Dental Technology

Background:

  • Intermolar torque is critical for achieving proper dental occlusion and facial esthetics.
  • Accurate measurement of posterior tooth torque is essential for effective orthodontic treatment planning.

Purpose of the Study:

  • To introduce a novel, cost-effective device for measuring intermolar torque.
  • To provide a simple, valid, and rapid method for assessing torque in molar teeth.

Main Methods:

  • Development of a device with two movable, adjustable arms positioned on bilateral molar teeth.
  • Utilizing a graduated plane on the device to directly indicate the measured intermolar torque.

Main Results:

  • The introduced device allows for easy and rapid measurement of intermolar torque.
  • The device demonstrates high validity and cost-effectiveness for clinical application.

Conclusions:

  • The new device offers a practical solution for quantifying intermolar torque.
  • This tool can aid dentists and orthodontists in improving treatment outcomes related to esthetics and occlusion.