Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Screw: Problem Solving01:21

Screw: Problem Solving

740
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.
To evaluate the...
740
Frictional Forces on Screws01:17

Frictional Forces on Screws

1.7K
Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
1.7K
Net Torque Calculations01:19

Net Torque Calculations

11.8K
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...
11.8K
Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

829
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...
829
Self-Locking Screw01:16

Self-Locking Screw

2.6K
A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
2.6K
Upward Impending Motion01:21

Upward Impending Motion

619
A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
619

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Serving up prevention: design and implementation of a pharmacist-led workplace diabetes prevention model for the hospitality industry.

Frontiers in public health·2026
Same author

Evaluation of the Newborn Screening Pilot for Sickle Cell Disease in Suriname Using the Non-Adoption, Abandonment, Scale-Up, Spread, and Sustainability (NASSS) Framework.

International journal of neonatal screening·2024
Same author

Tooth agenesis: An overview of diagnosis, aetiology and management.

The Japanese dental science review·2023
Same author

Evaluation of the predicted vs. achieved occlusal outcomes with the Invisalign® appliance: A retrospective investigation of adult patients.

International orthodontics·2023
Same author

Characterization of Urinary Pesticide Metabolite Concentrations of Pregnant Women in Suriname.

Toxics·2022
Same author

How readable are orthognathic surgery consent forms?

International orthodontics·2022

Related Experiment Video

Updated: Mar 3, 2026

Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

24.0K

The influence of miniscrew insertion torque.

Melissa V Nguyen1, John Codrington2, Lloyd Fletcher2,3

  • 1Department of Orthodontics, University of Adelaide, Adelaide, South Australia, Australia.

European Journal of Orthodontics
|April 28, 2017
PubMed
Summary

Higher insertion torque during orthodontic miniscrew placement in porcine bone increases microdamage. This study found that 24 Ncm resulted in significantly more diffuse damage than lower torques, impacting insertion depth and bone integrity.

More Related Videos

An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model
09:07

An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model

Published on: May 31, 2017

8.1K
A Minimally Invasive Model to Analyze Endochondral Fracture Healing in Mice Under Standardized Biomechanical Conditions
06:41

A Minimally Invasive Model to Analyze Endochondral Fracture Healing in Mice Under Standardized Biomechanical Conditions

Published on: March 22, 2018

8.7K

Related Experiment Videos

Last Updated: Mar 3, 2026

Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

24.0K
An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model
09:07

An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model

Published on: May 31, 2017

8.1K
A Minimally Invasive Model to Analyze Endochondral Fracture Healing in Mice Under Standardized Biomechanical Conditions
06:41

A Minimally Invasive Model to Analyze Endochondral Fracture Healing in Mice Under Standardized Biomechanical Conditions

Published on: March 22, 2018

8.7K

Area of Science:

  • Orthodontics
  • Biomaterials Science
  • Surgical Implantology

Background:

  • Orthodontic miniscrews (OMs) are crucial for anchorage.
  • Understanding bone microdamage from OMs is vital for clinical success.
  • Porcine tibia offers a relevant in vitro model for bone insertion studies.

Purpose of the Study:

  • To evaluate microdamage development in porcine tibia after orthodontic miniscrew insertion.
  • To assess the impact of varying insertion torque values (12, 18, 24 Ncm) on bone surface.
  • To correlate insertion torque with miniscrew insertion depth and microdamage extent.

Main Methods:

  • In vitro insertion of Aarhus OMs (1.5x6 mm) into 1.5 mm thick porcine tibia.
  • Utilized a torque-limiting screwdriver set at 12, 18, and 24 Ncm.
  • Assessed microdamage using sequential staining, laser confocal microscopy, and histomorphometry.

Main Results:

  • Complete miniscrew insertion was achieved only at 24 Ncm.
  • Higher torque (24 Ncm) significantly increased diffuse damage area and radius on bone surfaces (P < 0.05).
  • Increased insertion torque correlated with greater insertion depth and more extensive microdamage.

Conclusions:

  • Insertion torque directly influences orthodontic miniscrew seating and resultant bone microdamage.
  • Higher insertion torque leads to more significant microdamage in thin cortical bone.
  • Clinical protocols should consider torque limits to minimize bone trauma during miniscrew placement.