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Related Concept Videos

Veneer01:19

Veneer

280
Veneer refers to a thin sheet of wood, typically produced to a thickness of about one-eighth of an inch or less. This material is crafted through various methods, the most common being rotary cutting. In this process, a log is mounted into a large lathe and spun against a knife edge, peeling off a continuous strip of wood as the knife penetrates deeper into the rotating log, creating a rotary-cut veneer.
Other veneering techniques include plain-slicing, quarter-slicing, and rift-slicing. These...
280
Flexural Stress01:16

Flexural Stress

594
When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
594
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

382
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...
382
Residual Stresses in Bending01:18

Residual Stresses in Bending

455
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
455
Tooth Anatomy01:21

Tooth Anatomy

1.8K
The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
1.8K
Stress Concentrations01:24

Stress Concentrations

552
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...
552

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Related Experiment Videos

A cusp supporting framework design can decrease critical stresses in veneered molar crowns.

Armin Kirsten1, Daniel Parkot1, Stefan Raith1

  • 1Department of Dental Materials and Biomaterials Research, RWTH Aachen University Hospital, Germany.

Dental Materials : Official Publication of the Academy of Dental Materials
|January 7, 2014
PubMed
Summary

A cusp-supporting framework design significantly reduces stress in dental crowns, lowering the risk of veneering fractures in ceramic restorations. This design is crucial for enhancing the longevity of all-ceramic dental prosthetics.

Keywords:
All-ceramic restorationsChippingCusp supporting designFinite element analysisFramework designFramework materialStress distributionVeneering failure

Related Experiment Videos

Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Mechanical Engineering

Background:

  • Veneered zirconia restorations frequently fail due to fractures in the veneering material.
  • Current designs may not adequately protect against catastrophic failures in all-ceramic restorations.

Purpose of the Study:

  • To investigate the impact of framework design and material on stress distribution in single-tooth restorations.
  • To test the hypothesis that a cusp-supporting framework can prevent veneering fractures.

Main Methods:

  • Finite element analysis (FEA) was used on a 3D model of a lower molar crown.
  • Framework designs included cusp-supporting and constant thickness.
  • Materials tested were zirconia, alumina, gold alloy frameworks with glass ceramic veneering.
  • Simulated load cases included terminal occlusion and concentrated cusp loading.

Main Results:

  • Maximum tensile stresses in the veneering material were concentrated in the fissure region.
  • A cusp-supporting framework reduced maximum tensile stresses by up to 30.5%.
  • Concentrated cusp loading resulted in approximately four times higher stress levels than terminal occlusion.

Conclusions:

  • A cusp-supporting framework design effectively reduces tensile stresses in the veneering material of single crowns.
  • This design is expected to lower the in vivo risk of veneering failure in dental restorations.