Featured Research

from universities, journals, and other organizations

Laser Technique Able To Detect Developing Cavities

Date:
February 24, 2003
Source:
University Of Toronto
Summary:
Forget sharp metal picks or X-rays-in the future, your dentist may search for cavities using a painless laser-based technique developed at the University of Toronto that can detect cracks or defects at an early stage of development.

Forget sharp metal picks or X-rays-in the future, your dentist may search for cavities using a painless laser-based technique developed at the University of Toronto that can detect cracks or defects at an early stage of development.

Related Articles


"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.


Story Source:

The above story is based on materials provided by University Of Toronto. Note: Materials may be edited for content and length.


Cite This Page:

University Of Toronto. "Laser Technique Able To Detect Developing Cavities." ScienceDaily. ScienceDaily, 24 February 2003. <www.sciencedaily.com/releases/2003/02/030224082450.htm>.
University Of Toronto. (2003, February 24). Laser Technique Able To Detect Developing Cavities. ScienceDaily. Retrieved April 21, 2015 from www.sciencedaily.com/releases/2003/02/030224082450.htm
University Of Toronto. "Laser Technique Able To Detect Developing Cavities." ScienceDaily. www.sciencedaily.com/releases/2003/02/030224082450.htm (accessed April 21, 2015).

Share This


More From ScienceDaily



More Health & Medicine News

Tuesday, April 21, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Blue Bell Recalls All Products

Blue Bell Recalls All Products

AP (Apr. 21, 2015) Blue Bell Creameries voluntary recalled for all of its products after two samples of chocolate chip cookie dough ice cream tested positive for listeria, a potentially deadly bacteria. Blue Bell&apos;s President and CEO issued a video statement. (April 21) Video provided by AP
Powered by NewsLook.com
'Tutu Tuesdays' Brighten Faces at Kids' Hospital

'Tutu Tuesdays' Brighten Faces at Kids' Hospital

AP (Apr. 21, 2015) Doctors and nurses have started wearing ballet tutus every Tuesday to cheer up young hospital patients at a Florida hospital. It started with a request made by a nervous patient -- now, almost the entire staff is wearing the tutus. (April 21) Video provided by AP
Powered by NewsLook.com
Humanoid Robot Can Recognise and Interact With People

Humanoid Robot Can Recognise and Interact With People

Reuters - Innovations Video Online (Apr. 20, 2015) An ultra-realistic humanoid robot called &apos;Han&apos; recognises and interprets people&apos;s facial expressions and can even hold simple conversations. Developers Hanson Robotics hope androids like Han could have uses in hospitality and health care industries where face-to-face communication is vital. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Labour Party Warns Britain's Health Service 'on Life Support'

Labour Party Warns Britain's Health Service 'on Life Support'

AFP (Apr. 20, 2015) Britain&apos;s opposition Labour Party Monday claimed the National Health Service (NHS) was &apos;on life support&apos; as it turned its attention to the state-run service, which is a key issue for the UK&apos;s May 7 general election. Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins