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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Partial Fractions01:28

Partial Fractions

A partial fraction is a component of a rational expression represented as the sum of simpler fractions. When a rational function is expressed as a ratio of two polynomials, it can often be decomposed into a sum of fractions whose denominators are simpler polynomials, typically linear or irreducible quadratic factors. This process is called partial fraction decomposition, and it is used to simplify complex expressions for integration, solving equations, or analysis.Partial fraction decomposition...
Atomic Force Microscopy01:08

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The probe is regarded as the heart of any AFM setup and comprises the...
X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
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Radical Formation: Abstraction00:47

Radical Formation: Abstraction

The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
Even though homolysis produces radicals, it is different from radical...
Framing Effects03:26

Framing Effects

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Related Experiment Video

Updated: Jun 25, 2026

Asymmetrical Flow Field-Flow Fractionation for Sizing of Gold Nanoparticles in Suspension
09:33

Asymmetrical Flow Field-Flow Fractionation for Sizing of Gold Nanoparticles in Suspension

Published on: September 11, 2020

Abfraction: separating fact from fiction.

J A Michael1, G C Townsend, L F Greenwood

  • 1School of Dentistry, The University of Adelaide, South Australia.

Australian Dental Journal
|February 21, 2009
PubMed
Summary
This summary is machine-generated.

Abfraction, a theoretical cause of non-carious cervical lesions, lacks robust clinical evidence. Oral health professionals should avoid irreversible treatments for suspected abfraction lesions due to insufficient scientific backing.

Related Experiment Videos

Last Updated: Jun 25, 2026

Asymmetrical Flow Field-Flow Fractionation for Sizing of Gold Nanoparticles in Suspension
09:33

Asymmetrical Flow Field-Flow Fractionation for Sizing of Gold Nanoparticles in Suspension

Published on: September 11, 2020

Area of Science:

  • Dental Biomaterials and Biomechanics
  • Cariology and Operative Dentistry

Background:

  • Non-carious cervical lesions (NCCLs) involve hard tissue loss at the tooth's cervical third, unrelated to caries.
  • Potential causes of NCCLs include abrasion, corrosion, and abfraction, often acting concurrently.

Purpose of the Study:

  • To critically review the scientific literature supporting and refuting the concept of abfraction as a cause of NCCLs.
  • To evaluate the clinical evidence for abfraction and its association with occlusal factors and bruxism.

Main Methods:

  • Comprehensive literature review of studies investigating abfraction, finite element analysis, and clinical observations.
  • Analysis of experimental and clinical data to assess the validity of abfraction as a pathological process.

Main Results:

  • Theoretical support for abfraction exists, primarily from finite element analysis, but these studies have limitations.
  • Experimental evidence for abfraction is minimal; clinical studies show associations but not causation with bruxism or occlusal factors.
  • Abfraction lesions have not been identified in pre-contemporary populations, suggesting a lack of historical prevalence.

Conclusions:

  • Abfraction remains a theoretical concept lacking sufficient clinical evidence to confirm its role in NCCLs.
  • Oral health professionals should exercise caution and avoid irreversible treatments like occlusal adjustments for presumed abfraction lesions.
  • Further rigorous clinical research is needed to substantiate or refute the abfraction hypothesis.