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Related Concept Videos

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...
Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
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...
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 Concentrations01:13

Stress Concentrations

The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress concentration...
Stress Concentrations01:24

Stress Concentrations

Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller width...

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Related Experiment Video

Updated: Jul 12, 2026

Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes
06:34

Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes

Published on: January 6, 2023

Stress distribution in miniscrews with different insertion angles: A finite element analysis study.

Rishibha Bhardwaj1, Dhara Shukla2, P C Ramesh Kumar3

  • 1Associate Professor, Department of Orthodontics, School of Dental Sciences, Sharda University, Greater Noida, India.

Journal of Orthodontic Science
|July 11, 2026
PubMed
Summary

Optimal orthodontic miniscrew placement at a 45° angle minimizes stress and micromotion, enhancing biomechanical stability. This angle reduces failure risk, improving clinical outcomes for temporary anchorage devices (TADs).

Keywords:
Bone densityfinite element analysisinsertion anglemicromotionminiscreworthodontic anchoragestress distribution

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A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
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A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials

Published on: May 18, 2015

Related Experiment Videos

Last Updated: Jul 12, 2026

Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes
06:34

Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes

Published on: January 6, 2023

A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
11:28

A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials

Published on: May 18, 2015

Area of Science:

  • Orthodontics
  • Biomaterials Engineering
  • Biomechanics

Background:

  • Orthodontic miniscrews are vital temporary anchorage devices (TADs).
  • Clinical success is often compromised by biomechanical instability.
  • Understanding insertion angle's impact is crucial for stability.

Purpose of the Study:

  • To evaluate the biomechanical effects of varying miniscrew insertion angles.
  • To analyze stress distribution and micromotion using finite element analysis (FEA).
  • To identify optimal angulation for enhanced miniscrew stability.

Main Methods:

  • Finite element analysis (FEA) on 225 Indian adult mandibular models.
  • Titanium alloy miniscrews inserted at 30°, 45°, 60°, and 90°.
  • Application of vertical and oblique orthodontic loads (2N and 5N).

Main Results:

  • A 45° insertion angle showed the most favorable biomechanical profile.
  • Lowest von Mises stress (61.2 MPa) and minimal micromotion (0.033 mm) observed at 45°.
  • Insertion angle and bone density significantly predicted stress and micromotion (adjusted R² = 0.89).

Conclusions:

  • A 45° miniscrew insertion angle provides biomechanical superiority.
  • This angulation reduces stress concentrations and the risk of micromotion.
  • Offers evidence-based guidance for orthodontic practice, especially in Indian populations.