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Related Concept Videos

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...
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Screw: Problem Solving01:21

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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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Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the shaft's...
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Updated: May 29, 2026

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition
07:32

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Published on: February 23, 2024

Are torque values of preadjusted brackets precise?

Alessandra Motta Streva1, Flávio Augusto Cotrim-Ferreira, Daniela Gamba Garib

  • 1Department of Orthodontics, Dental School, University of São Paulo, São Paulo, SP, Brazil. amstreva@yahoo.com.br

Journal of Applied Oral Science : Revista FOB
|September 30, 2011
PubMed
Summary
This summary is machine-generated.

Torque precision varies significantly among metallic orthodontic brackets from different brands. Some brands show significant deviations, potentially impacting final tooth positioning in orthodontic treatments.

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Published on: July 24, 2018

Area of Science:

  • Orthodontics
  • Biomaterials Science
  • Dental Mechanics

Background:

  • Torque control is crucial in orthodontic treatment for precise tooth positioning.
  • Metallic brackets with MBT (McLaughlin, Bennett, and Trevisi) prescription are widely used.
  • Variations in bracket manufacturing can lead to inaccuracies in applied torque.

Purpose of the Study:

  • To evaluate the torque precision of metallic canine brackets from six commercial brands.
  • To compare measured torque values against the MBT prescription standards.
  • To identify brands with significant torque deviations.

Main Methods:

  • Six commercial brands of maxillary and mandibular canine brackets were selected.
  • Torque angles were measured using an optical microscope and computer analysis.
  • Measured values were compared to MBT prescription specifications.

Main Results:

  • Morelli maxillary canine brackets showed a statistically significant difference in torque (-3.33º) compared to the MBT standard (-7º).
  • American Orthodontics (-6.34º) and Ortho Organizers (-6.25º) mandibular canine brackets significantly differed from the MBT standard (-6º).
  • Morelli exhibited significant torque differences compared to other brands for maxillary canines, but no inter-brand differences were found for mandibular canines.

Conclusions:

  • Significant variations in torque values exist among assessed metallic orthodontic brackets.
  • These torque inaccuracies could clinically compromise the buccolingual tooth alignment at the conclusion of orthodontic therapy.
  • Dentists should be aware of potential torque discrepancies when selecting brackets.