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Related Concept Videos

Frictional Forces on Screws01:17

Frictional Forces on Screws

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...
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...
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
Self-Locking Screw01:16

Self-Locking Screw

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.

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Installation Method to Enhance Quality Control for Fiber Reinforced Polymer Spike Anchors
06:21

Installation Method to Enhance Quality Control for Fiber Reinforced Polymer Spike Anchors

Published on: April 10, 2018

Temporary anchorage device stability: an evaluation of thread shape factor.

M Migliorati1, A Signori, A Silvestrini-Biavati

  • 1Orthodontics Department, Genoa University School of Dentistry, Italy. Marco.Migliorati@unige.it

European Journal of Orthodontics
|March 4, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces the thread shape factor (TSF) to assess temporary anchorage devices (TADs). TSF, along with thread depth and pitch, significantly predicts the peak extraction load, enhancing mechanical competency evaluation.

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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

Published on: February 10, 2014

Area of Science:

  • Orthodontics and Dental Materials Science
  • Biomaterials Engineering
  • Mechanical Testing

Background:

  • Temporary anchorage devices (TADs) are crucial for orthodontic treatment, but their extraction resistance is influenced by design and bone factors.
  • Existing evaluation methods for TAD mechanical properties may not fully capture the nuances of miniscrew design.
  • A novel metric is needed to better predict the stability and mechanical competency of TADs.

Purpose of the Study:

  • To introduce and validate the thread shape factor (TSF) as a new parameter for evaluating the mechanical properties of TADs.
  • To compare the mechanical performance of three different TAD designs using TSF and traditional metrics.
  • To determine the predictive value of TSF, thread depth (D), and pitch (P) on the peak extraction load of TADs.

Main Methods:

  • Three TADs (Mini-impianto autoforante, Orthoscrew, MAS) were tested (n=27).
  • Scanning electron microscopy was used to measure thread depth (D), pitch (P), and calculate TSF.
  • Pullout tests were conducted on a bone analogue using a universal testing machine at a crosshead speed of 2 mm/min.
  • Statistical analysis included two-way ANOVA, post hoc tests, and univariate linear regression.

Main Results:

  • TSF, D, and P were identified as statistically significant predictors of peak extraction load.
  • The thread shape factor (TSF) demonstrated statistical significance in describing the mechanical competency of TADs.
  • Analysis revealed significant interactions between miniscrew type and cortical thickness, influencing extraction resistance.

Conclusions:

  • The thread shape factor (TSF) is a valuable new metric for assessing the mechanical competency and predicting the stability of temporary anchorage devices.
  • TSF, in conjunction with thread depth and pitch, provides a more comprehensive evaluation of TAD mechanical properties.
  • This research offers a refined approach to understanding and selecting TADs based on their design-related mechanical performance.