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Related Concept Videos

Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

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

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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...
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Stress Concentrations01:24

Stress Concentrations

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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...
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Applications of Stress01:04

Applications of Stress

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Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
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Components of Stress01:23

Components of Stress

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Stress analysis under multiple loading conditions is intricate, necessitating a comprehensive grasp of normal and shearing stresses. Consider a small cube at point O, subjected to stress on all six faces, visible or not. Normal stress components σx, σy, σz act perpendicularly to the x, y, and z axes. Shearing stress components τxy and τxz are exerted on faces perpendicular to these axes.
Interestingly, the hidden cube faces also experience these stresses, equal and...
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Stress: General Loading Conditions01:15

Stress: General Loading Conditions

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To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
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Socket shield technique: Stress distribution analysis.

Ricardo Guimarães Neves1, Priscilla Cardoso Lazari-Carvalho2, Marco Aurélio Carvalho2

  • 1Private Practice, Goiânia, GO, Brazil.

Journal of Indian Society of Periodontology
|August 18, 2023
PubMed
Summary

The socket shield (SS) technique for tooth loss shows higher stress in bone tissues compared to other methods. This technique leads to the greatest stress concentration around implants.

Keywords:
Alveolar ridgefinite element analysisimplant placement

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Area of Science:

  • Biomaterials science
  • Dental implantology
  • Biomechanics

Background:

  • Finite element analysis (FEA) is used to assess stress distribution in dental implantology.
  • The socket shield (SS) technique is a method for treating tooth loss.
  • Comparing the SS technique to other methods is crucial for understanding implant success.

Purpose of the Study:

  • To analyze stress distribution in peri-implant bone tissues, implants, and prosthetic components using FEA.
  • To compare the SS technique with heterologous bone graft (HBG) and control (C) methods.
  • To evaluate the biomechanical effects of different implant placement strategies.

Main Methods:

  • A 3D FEA model of a superior central incisor implant was created.
  • Three conditions were simulated: SS, HBG, and control (fully embedded implant).
  • Oblique loads simulating maximal intercuspation and protrusion were applied.

Main Results:

  • Stress values in bone tissues were higher for SS and HBG compared to the control.
  • The SS technique exhibited the highest stress concentration in peri-implant tissues.
  • Minimal differences in stress were observed for the root fragment, bone graft, implant, and prosthetic components.

Conclusions:

  • The SS technique results in increased stress concentration in peri-implant bone tissues.
  • FEA provides valuable insights into the biomechanical performance of different implant techniques.
  • Further research may explore modifications to the SS technique to mitigate stress.