Written by Science Knowledge on 2:04 AM


Bacteria love hanging out between your teeth—food gets caught there, and brushing can’t reach all the germs. If the bugs settle in and form a cavity, your dentist must drill through your tooth just to get at it. But now dentists can trade their drills for a simple treatment that stops early-stage cavities. The Icon system lets dentists halt decay between teeth. Usually when a dentist spots an early cavity—when bacteria have eaten away enough tooth such that it’s a weak lattice but hasn’t yet degraded into a true cavity’s sinkhole—he prescribes an enamelstrengthening fluoride rinse and hopes the tooth heals itself. If that doesn’t work, the only option is drilling through healthy tooth to get to the problem spot. Icon, developed by dental-materials manufacturer DMG, does away with both the drill and the waiting time. A dentist simply slides a thin plastic applicator between the patient’s teeth and squirts the cavity with hydrochloric acid, which etches away the enamel to access the tooth’s deeper layers. Using a fresh applicator, he then injects a low-viscosity resin into the gaps in the tooth’s lattice and hardens the resin with a quick flash of high-energy blue light to fortify the tooth. DMG is working on a version that could hold up to the wear and tear of a tooth’s chewing surfaces, which company president George Wolfe hopes to have ready in a year. The sooner the better, he says: “One of my greatest fears is having to hold down my scared kid for a filling. Hopefully, I’ll never have to.”

Source of Information : Popular Science February 2010

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In its broadest sense, science (from the Latin scientia, meaning "knowledge") refers to any systematic knowledge or practice. In its more usual restricted sense, science refers to a system of acquiring knowledge based on scientific method, as well as to the organized body of knowledge gained through such research.

Fields of science are commonly classified along two major lines: natural sciences, which study natural phenomena (including biological life), and social sciences, which study human behavior and societies. These groupings are empirical sciences, which means the knowledge must be based on observable phenomena and capable of being experimented for its validity by other researchers working under the same conditions.

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