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Related Concept Videos

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...
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...
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...

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Related Experiment Video

Updated: Jul 3, 2026

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

Removal torque values of surface-treated mini-implants after loading.

Seong-Hun Kim1, Jae-Hee Cho, Kyu-Rhim Chung

  • 1Department of Orthodontics, Catholic University of Korea, Uijongbu St Mary's Hospital, Uijongbu, Korea. bravortho@catholic.ac.kr

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|July 12, 2008
PubMed
Summary
This summary is machine-generated.

Surface-treated mini-implants are safely removable after orthodontic treatment. A nonloading period under 6 months is recommended before removal to avoid complications and ensure successful removal torque values.

Related Experiment Videos

Last Updated: Jul 3, 2026

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
  • Dental Implantology
  • Biomaterials

Background:

  • Sand-blasted, large-grit, and acid-etched surface-treated mini-implants (C-implant) offer high stability for orthodontic anchorage.
  • The removal characteristics of these early-loaded mini-implants are not well-documented.

Purpose of the Study:

  • To evaluate the removal torque values (RTVs) of early-loaded, surface-treated mini-implants after orthodontic treatment.

Main Methods:

  • Sixty-four mini-implants (1.8 x 8.5 mm) were placed in 37 patients for orthodontic anchorage.
  • Early loading was initiated after a 4-week healing period.
  • Removal torque values were measured using a calibrated digital torque driver.

Main Results:

  • A 100% success rate was observed, with no implant fractures or distortions during removal.
  • The mean RTV was 16.4 Ncm (range: 3.94-35.41 Ncm).
  • A longer nonloading period (>6 months) was significantly associated with higher RTVs.

Conclusions:

  • Surface-treated mini-implants can be safely removed post-orthodontic treatment.
  • A nonloading period of less than 6 months prior to removal is advisable to minimize potential complications.