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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
Paramagnetism01:30

Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
Diamagnetism01:26

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.

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Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention
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Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention

Published on: September 18, 2015

Magnetic retention for obturators.

Samira K Al-Salehi1, Ian D Calder, David J Lamb

  • 1Department of Adult Dental Care, Sheffield School of Clinical Dentistry, University of Sheffield, Sheffield, UK. s.k.al-salehi@sheffield.ac.uk

Journal of Prosthodontics : Official Journal of the American College of Prosthodontists
|June 22, 2007
PubMed
Summary

This study showcases a magnetically retained, implant-supported denture for maxilla restoration after hemi-maxillectomy. The prosthetic solution significantly improved patients' quality of life, reducing oral health impacts.

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Prosthodontics
  • Implant Dentistry

Background:

  • Maxillectomy and developmental defects present significant challenges for prosthetic rehabilitation.
  • Restoring the maxilla requires advanced prosthetic solutions to regain function and aesthetics.

Observation:

  • A case study detailing the use of a magnetically retained, implant-supported denture for a patient with hemi-maxillectomy.
  • The prosthetic device was designed to restore the resected maxilla.

Findings:

  • The implant-supported denture demonstrated successful restoration of the maxilla.
  • Significant reduction in adverse oral health impacts was observed using the Oral Health Impact Profile (OHIP) at 2 weeks and 6 months post-treatment.

Implications:

  • Magnetically retained, implant-supported dentures offer a viable and effective treatment option for complex maxillectomy defects.
  • This approach can markedly improve patient-reported outcomes and quality of life in prosthetic rehabilitation.