Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Laser Technique Able to Detect Developing Cavities

21.02.2003


Forget sharp metal picks or X-rays-in the future, your dentist may search for cavities using a painless laser-based technique developed at U of T that can detect cracks or defects at an early stage of development.
v "Using the technique, we can see all the way to the pulp-more than five millimetres inside a tooth," says Professor Andreas Mandelis of U of T’s Department of Mechanical and Industrial Engineering. "It can reveal suspicious regions invisible to the naked eye below the surface of the tooth."

Using a device similar to a laser pointer, Mandelis and his team directed near-infrared light at different frequencies towards human teeth. The light, upon penetrating a tooth, slightly heated it and generated infrared radiation that revealed cavities. Higher frequencies worked best to reveal defects near the surface of a tooth, while lower frequencies uncovered problems deep below the enamel. This method of heat-generating laser light is called depth profilometry.

While standard X-rays can reveal existing cavities, he says, his team’s photo-thermal technique can expose defects at very early stages of development, prompting preventive treatment. It also avoids the need for a heavy lead apron to protect patients from hazardous X-rays. The technique may have further applications in detecting skin and sub-dermal cancers. It can also detect flaws in metals, coatings or electronic devices.

The study, which appears in the January issue of the Review of Scientific Instruments, was funded by Materials and Manufacturing Ontario. CONTACT: Professor Andreas Mandelis, Department of Mechanical and Industrial Engineering, 416-978-5106, mandelis@mie.utoronto.ca or Nicolle Wahl, U of T public affairs, 416-978-6974, nicolle.wahl@utoronto.ca

Nicolle Wahl | U of T Public Affairs

More articles from Health and Medicine:

nachricht Discovery shows promise for treating Huntington's Disease
05.08.2020 | Ecole Polytechnique Fédérale de Lausanne

nachricht Carbon monoxide improves endurance performance
05.08.2020 | Universität Bayreuth

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: ScanCut project completed: laser cutting enables more intricate plug connector designs

Scientists at the Fraunhofer Institute for Laser Technology ILT have come up with a striking new addition to contact stamping technologies in the ERDF research project ScanCut. In collaboration with industry partners from North Rhine-Westphalia, the Aachen-based team of researchers developed a hybrid manufacturing process for the laser cutting of thin-walled metal strips. This new process makes it possible to fabricate even the tiniest details of contact parts in an eco-friendly, high-precision and efficient manner.

Plug connectors are tiny and, at first glance, unremarkable – yet modern vehicles would be unable to function without them. Several thousand plug connectors...

Im Focus: New Strategy Against Osteoporosis

An international research team has found a new approach that may be able to reduce bone loss in osteoporosis and maintain bone health.

Osteoporosis is the most common age-related bone disease which affects hundreds of millions of individuals worldwide. It is estimated that one in three women...

Im Focus: AI & single-cell genomics

New software predicts cell fate

Traditional single-cell sequencing methods help to reveal insights about cellular differences and functions - but they do this with static snapshots only...

Im Focus: TU Graz Researchers synthesize nanoparticles tailored for special applications

“Core-shell” clusters pave the way for new efficient nanomaterials that make catalysts, magnetic and laser sensors or measuring devices for detecting electromagnetic radiation more efficient.

Whether in innovative high-tech materials, more powerful computer chips, pharmaceuticals or in the field of renewable energies, nanoparticles – smallest...

Im Focus: Tailored light inspired by nature

An international research team with Prof. Cornelia Denz from the Institute of Applied Physics at the University of Münster develop for the first time light fields using caustics that do not change during propagation. With the new method, the physicists cleverly exploit light structures that can be seen in rainbows or when light is transmitted through drinking glasses.

Modern applications as high resolution microsopy or micro- or nanoscale material processing require customized laser beams that do not change during...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“Conference on Laser Polishing – LaP 2020”: The final touches for surfaces

23.07.2020 | Event News

Conference radar for cybersecurity

21.07.2020 | Event News

Contact Tracing Apps against COVID-19: German National Academy Leopoldina hosts international virtual panel discussion

07.07.2020 | Event News

 
Latest News

Rare Earth Elements in Norwegian Fjords?

06.08.2020 | Earth Sciences

Anode material for safe batteries with a long cycle life

06.08.2020 | Power and Electrical Engineering

Turning carbon dioxide into liquid fuel

06.08.2020 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>