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Related Concept Videos

Stress Concentrations01:24

Stress Concentrations

834
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...
834
Stress Concentrations01:13

Stress Concentrations

813
The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress...
813

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Related Experiment Video

Updated: May 1, 2026

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

955

A novel coping design to decrease maximum principal stress in zirconia ceramic restorations.

MooGyung Sung1, Chong-Hyun Han, Sunjai Kim

  • 1Private Practice, Dental Office Drs. Sung & Oh, Seoul, Korea.

Journal of Prosthodontics : Official Journal of the American College of Prosthodontists
|April 23, 2014
PubMed
Summary

A new zirconia coping design significantly lowers stress in dental crowns. However, avoid narrow zirconia beams to prevent increased stress in veneer ceramic layers.

Keywords:
Zirconiacopingdesignfinite element analysisstress

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Area of Science:

  • Biomaterials science
  • Dental materials
  • Mechanical engineering

Background:

  • Zirconia ceramics are widely used in dental restorations due to their strength and aesthetics.
  • Understanding stress distribution in zirconia ceramic crowns is crucial for improving restoration longevity.
  • Coping design plays a significant role in the mechanical performance of dental prosthetics.

Purpose of the Study:

  • To evaluate how modifications in coping design affect maximum first principal stress (MPS) in zirconia ceramic crowns.
  • To compare the stress-reducing potential of a novel zirconia coping design against conventional designs.

Main Methods:

  • A 3D finite element analysis model of a mandibular second molar was created.
  • Three coping designs were simulated: constant thickness, constant thickness with extended collars, and a novel design with zirconia beam reinforcement.
  • Loads were applied to simulate chewing forces, and MPS in veneer ceramics was evaluated.

Main Results:

  • The novel zirconia coping design generally resulted in the lowest MPS in veneer ceramics across various loading conditions.
  • An exception was observed with a 0.5 mm zirconia beam width under mesial horizontal load, where MPS increased.
  • The novel design with wider zirconia beams (0.8mm and 1mm) demonstrated superior stress reduction.

Conclusions:

  • The novel zirconia coping design effectively reduces MPS in veneer ceramics compared to conventional designs.
  • The width of the zirconia beams in the novel design is critical; narrow beams (0.5mm) should be avoided.
  • Optimized zirconia beam reinforcement in coping design can enhance the durability of zirconia ceramic dental restorations.