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Related Concept Videos

Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Stress Concentrations in Circular Shafts

Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
Framing Effects03:26

Framing Effects

Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in different ways based on the...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Residual Stresses01:26

Residual Stresses

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...

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Updated: Jul 4, 2026

Revealing the Ferroptotic Phenotype of Medulloblastoma
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Revealing the Ferroptotic Phenotype of Medulloblastoma

Published on: March 15, 2024

The ferrule effect.

Nikolai Stankiewicz1, Peter Wilson

  • 1Restorative Dentistry Section, University of Melbourne, Australia.

Dental Update
|June 19, 2008
PubMed
Summary
This summary is machine-generated.

Providing a ferrule effect during post-retained crown restoration strengthens root-filled teeth. This review examines evidence and materials influencing the ferrule effect for optimal tooth restoration strength.

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Last Updated: Jul 4, 2026

Revealing the Ferroptotic Phenotype of Medulloblastoma
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03:07

Scanning Electron Microscopic Evaluation of Surface Defects of Remover Retreatment File After Single and Multiple Uses

Published on: October 11, 2024

Area of Science:

  • Restorative Dentistry
  • Biomaterials Science

Background:

  • Root-filled teeth often require crowns for structural integrity.
  • The ferrule effect, engaging supra-marginal dentine with a crown, enhances tooth-restoration complex strength.
  • Understanding the ferrule effect is crucial for successful post-retained crown restorations.

Purpose of the Study:

  • To review current evidence supporting the ferrule effect in restorative dentistry.
  • To examine the influence of various post and core materials on the ferrule effect.
  • To discuss methods for achieving an adequate ferrule and consider failure planning.

Main Methods:

  • Literature review of existing studies on the ferrule effect.
  • Analysis of research investigating post and core material interactions with tooth structure.
  • Synthesis of information on clinical techniques for ferrule preparation and restoration.

Main Results:

  • Evidence suggests the ferrule effect significantly improves the mechanical resistance of restored teeth.
  • Different post and core materials exhibit varying degrees of influence on ferrule stability and longevity.
  • Achieving adequate ferrule height and considering material selection are key factors.

Conclusions:

  • Incorporating the ferrule effect in treatment planning optimizes the strength and prognosis of root-filled teeth restored with post-retained crowns.
  • Careful consideration of materials and preparation techniques is essential for maximizing the benefits of the ferrule effect.
  • Planning for potential failure modes is an integral part of successful restorative treatment.