Xenophilia (True Strange Stuff)

Blog of the real Xenophilius Lovegood, a slightly mad scientist

Japanese tooth patch could mean the end of tooth decay

Posted by Anonymous on September 22, 2012

The ultra thin biocompatible film (top) and the tooth-patch being applied (bottom) onto a man's front teeth at a laboratory in Kinokawa in western Japan.Scientists in Japan have created a microscopically thin film that can coat individual teeth to prevent decay or to make them appear whiter, the chief researcher said.

The “tooth patch” is a hard-wearing and ultra-flexible material made from hydroxyapatite, the main mineral in tooth enamel, that could also mean an end to sensitive teeth.

“This is the world’s first flexible apatite sheet, which we hope to use to protect teeth or repair damaged enamel,” said Shigeki Hontsu, professor at Kinki University’s Faculty of Biology-Oriented Science and Technology in western Japan.

“Dentists used to think an all-apatite sheet was just a dream, but we are aiming to create artificial enamel,” the outermost layer of a tooth, he said earlier this month.

Researchers can create film just 0.004 millimetres thick by firing lasers at compressed blocks of hydroxyapatite in a vacuum to make individual particles pop out.

These particles fall onto a block of salt which is heated to crystallise them, before the salt stand is dissolved in water.

The film is scooped up onto filter paper and dried, after which it is robust enough to be picked up by a pair of tweezers.

“The moment you put it on a tooth surface, it becomes invisible. You can barely see it if you examine it under a light,” Hontsu told AFP by telephone.

The sheet has a number of minute holes that allow liquid and air to escape from underneath to prevent their forming bubbles when it is applied onto a tooth.

One problem is that it takes almost one day for the film to adhere firmly to the tooth’s surface, said Hontsu.

The film is currently transparent but it is possible to make it white for use in cosmetic dentistry.

Researchers are experimenting on disused human teeth at the moment but the team will soon move to tests with animals, Hontsu said, adding he was also trying it on his own teeth.

Five years or more would be needed before the film could be used in practical dental treatment such as covering exposed dentin – the sensitive layer underneath enamel – but it could be used cosmetically within three years, Hontsu said.

The technology, which has been jointly developed with Kazushi Yoshikawa, associate professor at Osaka Dental University, is patented in Japan and South Korea and applications are under way in the United States, Europe and China. …

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2 Responses to “Japanese tooth patch could mean the end of tooth decay”

  1. Corinna Fantauzzo said

    In order for tooth decay to be developed in a tooth, that tooth must have acid producing bacteria around it, along with food for the bacteria to feed upon. Teeth that are susceptible to decay will have little to no fluoride in the enamel to fight the plaque. Fluoride can destroy decay, although it won’t be able to do much once the decay has started to eat the teeth.-

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    • Xeno said

      I disagree. Fluoride will not destroy decay. Decay is destruction. You can’t destroy destruction. It does cause problems for acid producing bacteria, just as it does for our cells. Verdict: Don’t put fluoride in your body if you can help it. Kill the s mutans bacteria with tea tree oil mouth wash a few times a week and Remineralize your teeth daily using a toothpaste with novamin to heal the decay.

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