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Related Concept Videos

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.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
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Stress-Strain Diagram - Ductile Materials01:24

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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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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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Stress-Strain Diagram - Brittle Materials01:24

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Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
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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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Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

637
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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Updated: Sep 3, 2025

Real-Time Dynamic Navigation System for the Precise Quad-Zygomatic Implant Placement in a Patient with a Severely Atrophic Maxilla
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Stress Distribution Pattern in Zygomatic Implants Supporting Different Superstructure Materials.

Artak Heboyan1, Roberto Lo Giudice2, Les Kalman3

  • 1Department of Prosthodontics, Faculty of Stomatology, Yerevan State Medical University, Str. Koryun 2, Yerevan 0025, Armenia.

Materials (Basel, Switzerland)
|July 27, 2022
PubMed
Summary
This summary is machine-generated.

This study compared superstructure materials for zygomatic dental implants using 3D finite element analysis (FEA). Stiffer materials like zirconia, cobalt-chrome, and titanium alloys are preferable for reducing stress on implants and screws.

Keywords:
dental implantsdental materialsfinite element analysismaterialsprosthodontics

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Area of Science:

  • Biomaterials Science
  • Dental Implantology
  • Biomechanics

Background:

  • Zygomatic implants offer a solution for severe maxillary atrophy.
  • Understanding the mechanical behavior of different superstructure materials is crucial for implant success.

Purpose of the Study:

  • To compare the stress-strain patterns of zygomatic dental implants supporting various superstructure materials.
  • To evaluate the mechanical performance of different alloys and polymers in a 3D finite element model.

Main Methods:

  • A 3D finite element analysis (FEA) model of an edentulous maxilla with four implants (two standard, two zygomatic) was created.
  • Simulations included U-shaped bar superstructures made of cobalt-chrome (CoCr), titanium (Ti), zirconia (Zr), carbon-fiber (CF), and polyetheretherketone (PEEK).
  • An axial load of 500 N was applied to assess mechanical response.

Main Results:

  • All tested superstructure materials induced homogeneous strain in the bone tissue, indicating suitability for reconstructing the edentulous maxilla.
  • Stiffer materials (zirconia, CoCr, Ti) showed a reduced stress concentration in the zygomatic implants and prosthetic screws compared to less stiff materials.

Conclusions:

  • The choice of superstructure material significantly influences stress distribution in zygomatic implant systems.
  • Zirconia, cobalt-chrome, and titanium alloys are recommended for superstructures to minimize stress on zygomatic implants and screws, enhancing long-term stability.