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 Ts 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 teams 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, email@example.com or Nicolle Wahl, U of T public affairs, 416-978-6974, firstname.lastname@example.org
Nicolle Wahl | U of T Public Affairs
Organ-on-a-chip mimics heart's biomechanical properties
23.02.2017 | Vanderbilt University
Researchers identify cause of hereditary skeletal muscle disorder
22.02.2017 | Klinikum der Universität München
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
24.02.2017 | Life Sciences
24.02.2017 | Life Sciences
24.02.2017 | Trade Fair News