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Related Concept Videos

Stress Concentrations01:24

Stress Concentrations

387
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...
387
Residual Stresses01:26

Residual Stresses

290
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
290
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

1.0K
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...
1.0K
Applications of Stress01:04

Applications of Stress

409
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...
409
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

239
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
239
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

202
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
202

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Related Experiment Video

Updated: Sep 22, 2025

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

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Stress Distribution on Various Implant-Retained Bar Overdentures.

Övül Kümbüloğlu1, Beril Koyuncu1, Gözde Yerlioğlu1,2

  • 1Department of Prosthodontics, Ege University Faculty of Dentistry, Izmir 35040, Turkey.

Materials (Basel, Switzerland)
|May 20, 2022
PubMed
Summary

Using converting adapters in implant-supported overdentures significantly improves stress distribution, reducing stress around implants and bone. Material type had minimal impact when adapters were used.

Keywords:
CNC millingfinite element analysishader barimplant-supported mandibular overdenture

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Area of Science:

  • Biomaterials Science
  • Dental Implantology
  • Biomechanics

Background:

  • Implant-supported mandibular overdentures with Hader bar attachments are crucial for restoring function.
  • Understanding stress distribution is vital for long-term implant survival and bone health.
  • Fabrication techniques and materials can influence mechanical performance.

Purpose of the Study:

  • To evaluate the impact of different fabrication techniques and materials on stress distribution in implant-supported mandibular overdentures with Hader bar attachments.
  • To compare stress patterns with and without converting adapters.
  • To assess the influence of Titanium Grade 5 and Cobalt-Chromium materials.

Main Methods:

  • Three-dimensional finite element models of mandibular overdentures with two implants and Hader bar attachments were created.
  • Models varied in material (Titanium Grade 5, Cobalt-Chromium), fabrication (CNC milling, casting), and use of converting adapters.
  • Static loads were applied, and Von Mises stress and principal stress values were analyzed using ANSYS software.

Main Results:

  • The highest stress distribution was observed in the model without converting adapters (Model 1).
  • Intense stress concentration occurred around implant necks and surrounding cortical bone in all models.
  • Using converting adapters effectively reduced stress transmission to implants and bone.

Conclusions:

  • Converting adapters are recommended for implant-supported overdentures to enhance stress distribution and protect implants and bone.
  • The material choice for the Hader bar showed no significant effect on stress values when converting adapters were employed.
  • Fabrication methods and adapter use play a critical role in the biomechanical performance of overdenture systems.