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Dental Robot Chews Over a Toothy Problem

June 28th, 2007 Josh Umbehr Dentistry

dental bot.jpg Lack of an adequate method of field testing dental prosthetics is hindering dental development and is preventing the world from getting their drug emitting teeth.

A robotic system that mimics the biting, chewing and munching of the human jaw is being developed by UK researchers. Called Dento-Munch, it should provide a more realistic way to test materials for use in dentistry, they say.
Some £2.5 billion is spent every year in the UK alone on dental materials, which are used to replace or strengthen teeth. But Kazem Alemzadeh, an engineer at Bristol University and the Bristol Robotics Laboratory, says the way these materials respond to everyday wear and tear can be hard to predict.
“Without this knowledge the likely long-term performance of the materials cannot be judged,” Alemzadeh told New Scientist.
Lengthy clinical trials can show how these materials will fare, but are expensive and time-consuming to perform. Machines that act as surrogate mouths for “chew-testing” are cheaper and faster but, until now, they have been poor imitators of humans, says Alemzadeh.
Realistic movement
With colleagues, he is working on the first robot that can reproduce the full movement of the human jaw. Two platforms act as the upper and lower jaws, with the lower jaw capable of moving in 6 degrees of freedom. Just like the human jaw, it can move and rotate around each 3D axis: up and down, forwards and backwards, and left and right.
“Current laboratory simulators utilise only 2 degrees of freedom,” says Alemzadeh, “and results from different simulators are often very different.”
The software controlling the motors and gearboxes inside Dento-Munch are also designed to respond to loads in a similar way to muscle and tendon.
Furthermore, feedback loops in the control system slow the chewing when resistance is high, and speed it up when there is less resistance, to give a more realistic response. Data collected from people chewing will be used to calibrate the system.

New Scientist Tech…

Josh Umbehr

Josh Umbehr, MD founded AtlasMD Concierge Family Practice, one of the fastest growing insurance-free practices in the country. Currently developing an industry leading platform for direct primary care physicians: Atlas EMR Software for Concierge Medicine.

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