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Related Concept Videos

Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

209
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...
209
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

588
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...
588
General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

227
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
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Screw: Problem Solving01:21

Screw: Problem Solving

445
In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
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Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

221
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...
221
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

397
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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Related Experiment Video

Updated: Aug 5, 2025

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

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

Published on: December 20, 2024

433

Reverse Torque Value of Angulated Screw Channel Abutment before and after Cyclic Loading: An In Vitro Study.

Yu-Hsuan Chen1, Yu-Ling Wu1, Hung-Shyong Chen2,3

  • 1Department of Dentistry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 833, Taiwan.

Journal of Functional Biomaterials
|March 28, 2023
PubMed
Summary
This summary is machine-generated.

The angle of angulated screw channel (ASC) abutments influences screw preload, with larger angles reducing preload. Cyclic loading performance of angled ASC groups was comparable to straight groups, though the 25° ASC group showed increased wear.

Keywords:
angulated screw channelangulated screw-retained crowncyclic loadingimplantmechanical stressesreverse torque value

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Area of Science:

  • Dental Implantology
  • Biomaterials Science
  • Biomechanics

Background:

  • Angulated screw channel (ASC) abutments offer restorative flexibility in dental implantology.
  • Understanding the mechanical behavior of ASC abutments under varying angulations is crucial for predictable clinical outcomes.

Purpose of the Study:

  • To investigate the effect of different angulated screw channel (ASC) abutment angles on the preload acting on the abutment screw.
  • To evaluate the performance of ASC abutments after cyclic loading.

Main Methods:

  • Thirty implants with ASC abutments were divided into groups with 0°, 15°, and 25° access channels.
  • Reverse torque value (RTV) was measured to assess preload before and after cyclic loading (1 million cycles at 10 Hz).
  • Screw head wear was examined using digital microscopy and scanning electron microscopy (SEM).

Main Results:

  • A significant linear trend was observed between ASC angle and the percentage of straight RTV (sRTV), indicating larger angles result in smaller preloads.
  • No significant differences in RTV change after cyclic loading were found between the 0°, 15°, and 25° ASC groups.
  • The 25° ASC group exhibited the most severe screw head wear.

Conclusions:

  • The angle of the ASC significantly affects the actual preload on the abutment screw; greater angulation leads to reduced preload.
  • Angulated ASC abutments demonstrate comparable cyclic loading performance to straight abutments.
  • Clinical considerations for screw access angle are necessary to optimize preload and minimize potential wear.