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Related Concept Videos

Stability of structures01:14

Stability of structures

In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
Machines: Problem Solving I01:22

Machines: Problem Solving I

A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
Statically Indeterminate Problem Solving01:16

Statically Indeterminate Problem Solving

Statically indeterminate problems are those where statics alone can not determine the internal forces or reactions. Consider a structure comprising two cylindrical rods made of steel and brass. These rods are joined at point B and restrained by rigid supports at points A and C. Now, the reactions at points A and C and the deflection at point B are to be determined. This rod structure is classified as statically indeterminate as the structure has more supports than are necessary for maintaining...

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Related Experiment Video

Updated: May 10, 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

A comparative anchorage control study between conventional and self-ligating bracket systems using differential

Marcio Rodrigues de Almeida1, Francisco Herrero, Amine Fattal

  • 1a  Full Professor, Department of Orthodontics, University of North Parana, Londrina, PR, Brazil.

The Angle Orthodontist
|June 11, 2013
PubMed
Summary
This summary is machine-generated.

This study found no significant difference in molar anchorage loss between conventional brackets (CBs) and self-ligating brackets (SLBs) during orthodontic space closure. Both bracket systems demonstrated similar efficiency in preserving anchorage.

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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
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Related Experiment Videos

Last Updated: May 10, 2026

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

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Published on: July 24, 2018

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
11:51

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

Published on: February 10, 2014

Area of Science:

  • Orthodontics
  • Biomaterials Science

Background:

  • Anchorage preservation is crucial in orthodontics, especially after premolar extractions.
  • Differential moment mechanics offer a method to control tooth movement during space closure.

Purpose of the Study:

  • To compare the anchorage preservation efficiency of conventional brackets (CBs) versus self-ligating brackets (SLBs).
  • To evaluate these bracket types after first maxillary premolar extraction using differential moment mechanics.

Main Methods:

  • Thirty-eight patients undergoing maxillary first premolar extraction were divided into CB and SLB groups.
  • Both groups utilized NiTi intrusion arch and closing coil springs, followed by a mushroom loop archwire.
  • Lateral cephalograms were analyzed pre- and post-space closure.

Main Results:

  • No statistically significant difference in maxillary molar anchorage loss was observed between CBs (3.87 ± 1.35 mm) and SLBs (3.65 ± 1.73 mm).
  • A significant difference was noted in the vertical movement of incisor tips between the groups.

Conclusions:

  • Self-ligating brackets (SLBs) and conventional brackets (CBs) exhibit comparable efficiency in preserving molar anchorage during space closure with differential moments.
  • The choice between SLBs and CBs may not significantly impact molar anchorage preservation in this specific orthodontic protocol.