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Related Concept Videos

Microcracking in Concrete01:20

Microcracking in Concrete

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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

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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...
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Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

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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...
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Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

826
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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Factors Affecting Creep01:28

Factors Affecting Creep

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In normal-weight aggregate concrete, the hardened cement paste is the primary contributor to creep, whereas the aggregates, being stiffer than the cement paste, are more resilient to stress-induced deformation. The stiffness of the aggregates is defined by their modulus of elasticity, and the more voluminous they are in the concrete, the less it will creep.
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Stresses under Combined Loadings01:23

Stresses under Combined Loadings

278
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.
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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Vertical Load and Torque during Postspace Preparation and Their Influence on Microcrack Development.

Ahmed Jamleh1,2, Maryam Alghilan1,2, Asma Alsharif3

  • 1Restorative and Prosthetic Dental Sciences, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, Ministry of National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia.

Journal of Prosthodontics : Official Journal of the American College of Prosthodontists
|May 22, 2021
PubMed
Summary

The ParaPost system generated significantly lower vertical load and torque during post space preparation compared to the RelyX system. This suggests the ParaPost system may reduce the risk of microcracks in root canal treated teeth.

Keywords:
ParaPost fiber systemRelyX fiber postmicrocracktorquevertical load

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Area of Science:

  • Endodontics
  • Dental Materials Science
  • Biomaterials Engineering

Background:

  • Post space preparation is crucial for restoring endodontically treated teeth.
  • Excessive forces during post space preparation can lead to root damage, including microcracks.
  • Understanding the biomechanical forces generated by different post systems is essential for clinical decision-making.

Purpose of the Study:

  • To quantitatively assess the vertical load and torque during post space preparation using two different post systems.
  • To investigate the in vitro influence of these forces on the development of new microcracks in root dentin.

Main Methods:

  • Extracted premolars underwent root canal treatment and obturation.
  • Post space preparation was performed using either the ParaPost or RelyX fiber post system.
  • Vertical load, torque, and preparation time were recorded during post space preparation.
  • Micro-computed tomography was used to detect new microcracks before and after preparation.

Main Results:

  • Preparation times were similar between the ParaPost and RelyX systems.
  • The ParaPost system generated significantly lower peak vertical load and maximum torque compared to the RelyX system.
  • New microcracks were observed in a small number of samples prepared with the ParaPost system, but not with the RelyX system.

Conclusions:

  • The choice of post drill system significantly impacts the biomechanical forces exerted during post space preparation.
  • The ParaPost system demonstrated lower load and torque values, potentially offering a more favorable outcome regarding root integrity.
  • Further research is warranted to correlate these findings with long-term clinical success and fracture resistance.